specification for geodetic surveying services · 2011-03-01 · specification for geodetic...

Specification for GeodeticSurveying Services

Summary: This Specification for Geodetic Surveys sets out the requirements for GeodeticSurveying Services on trunk road schemes, including motorway schemes.

THE HIGHWAYS AGENCY

THE SCOTTISH OFFICE DEVELOPMENT DEPARTMENT

THE WELSH OFFICEY SWYDDFA GYMREIG

THE DEPARTMENT OF THE ENVIRONMENT FORNORTHERN IRELAND

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Volume 5 Section 1Part 2

April 1996

Registration of Amendments

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REGISTRATION OF AMENDMENTS

Amend Page No Signature & Date of Amend Page No Signature & Date ofNo incorporation of No incorporation of

amendments amendments

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MANUAL OF CONTRACT DOCUMENTS FOR HIGHWAY WORKS

VOLUME 5 CONTRACT DOCUMENTS FOR SPECIALIST ACTIVITIES SECTION 1 GEODETIC SURVEYS

PART 2

SPECIFICATION FOR GEODETIC SURVEYING SERVICES

Contents

1. Introduction1.1 General1.2 European Mutual Recognition1.3 Changes and Amendments to the Specification1.4 The Survey Contractor1.5 The Survey Advisor

2. Purpose and Scope2.1 Location2.2 Aim of the Project for which the Survey is Required2.3 Aim of the Survey2.4 Brief Description of Survey Area2.5 Use of the Survey Information

3. General Requirements3.1 Health and Safety at Work etc Act. 19743.2 Landowners, Occupiers and Entry3.3 Control3.4 Detail to be Surveyed3.5 Presentation3.6 General

4. Project Information4.1 Client4.2 Design Organisation4.3 Survey Advisor4.4 Existing Mapping4.5 Existing Aerial Photographs4.6 Landowners and Occupiers4.7 Access4.8 Restrictions4.9 Contacts4.10 Traffic Safety and Management4.11 Services4.12 Contract Drawings

5. Project Control5.1 Project Control Requirements5.2 Planimetric Control

5.2.1 Framework5.2.2 Location of Permanent Ground Markers5.2.3 Construction of Permanent Ground Markers

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5.2.4 Survey Grid5.2.5 Accuracy Acceptance Criteria5.2.6 Schedule of Permanent Control Stations5.2.7 Location Diagrams5.2.8 Control Framework Diagram

5.3 Vertical Control5.3.1 Framework5.3.2 Location5.3.3 Construction5.3.4 Datum5.3.5 Accuracy Acceptance Criteria5.3.6 Schedule of Bench Marks5.3.7 Location Diagrams5.3.8 Level Framework Diagram

5.4 Control Report

6. Revision or Upgrading of Existing Mapping6.1 Scale6.2 Area to be Surveyed6.3 Base Mapping6.4 Source of Base Mapping6.5 Base Mapping Source Medium

6.5.1 Drawings6.5.2 Digital

6.6 Planimetric Detail to be Revised or Upgraded6.7 Additional Details6.8 Detail Not Requiring Revision6.9 Planimetric Accuracy6.10 Height Information

6.10.1 Contours6.10.2 Spot Heights

6.11 Height Information Accuracy6.11.1 Contours6.11.2 Spot Heights

7. New Mapping7.1 Scale7.2 Features/Detail to be Surveyed

7.2.1 Control Points7.2.2 Building/Structures7.2.3 Boundary Features7.2.4 Roads, Tracks and Footpaths7.2.5 Street Furniture and Visible Service

Features7.2.6 Railways7.2.7 Water, Drainage and Coastal Features7.2.8 Slopes and Earthworks7.2.9 Woods, Trees and Recreation Areas7.2.10 Industrial7.2.11 Key Points7.2.12 Spot Levels

7.3 Accuracy7.4 Definition7.5 Presentation

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8. Aerial Photography8.1 Purpose of Photography8.2 Type of Photographic Coverage8.3 Area8.4 Scale8.5 Direction of Flight Lines8.6 Type of Aerial Film8.7 Film Identification8.8 Paper Prints8.9 Diapositives8.10 Duplicate Negatives8.11 Camera8.12 Filters8.13 Flying Conditions8.14 Materials to be Delivered

8.14.1 Film Negatives8.14.2 Other Materials to be Delivered

9. Surveys for Noise Evaluation9.1 Area to be Surveyed9.2 Building Levels9.3 Roof Types9.4 Representative Ground Levels9.5 Accuracy9.6 Presentation

10. Underground Services10.1 Area of Investigation10.2 Investigation Requirements10.3 Types of Survey

10.3.1 From Service Records10.3.2 From Service Records and On-Site Visual Investigation10.3.3 From Service Records, On-Site Visual Investigation and Route Tracing

10.4 Schedules and Reports10.5 CCTV Surveys10.6 Presentation

11. Existing Structures11.1 Location11.2 Detail to be Surveyed11.3 Dimensions11.4 Spot Levels11.5 Key Features11.6 Presentation

12. Presentation of Drawings12.1 General12.2 Drawing Format12.3 Grid12.4 Revision/Upgrading of Existing Mapping12.5 New Mapping12.6 Underground Services12.7 Plan Presentation

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12.8 Noise Evaluation12.9 Existing Structures

13. Presentation of Digital Data13.1 Introduction13.2 Purpose of Data and Basic Data Structure13.3 Data Classification

13.3.1 Data Model13.3.2 Data Set Grouping

13.4 Data Structure13.4.1 Data Format13.4.2 Geometric Definition

13.5 Presentation13.5.1 Data Representation13.5.2 Symbols13.5.3 Coverage

13.6 Proofs13.7 Data Integrity

14. Products to be Delivered14.1 Drawings14.2 Digital Data

14.2.1 Media Type14.2.2 Coverage14.2.3 Annotation

14.3 Final Report and Schedules

15. References

Appendix A Schedule of Landowners and OccupiersAppendix B Table of Feature SymbolsAppendix C Special Requirements for Traffic Safety and ManagementAppendix D Access RequirementsAppendix E Restrictions to the Survey programmeAppendix F Schedule of ContactsAppendix G Schedule of Existing Information on Underground ServicesAppendix H Schedule of Contract DrawingsAppendix J Construction of Permanent Ground MarkersAppendix K Location of Permanent Ground MarkersAppendix L Construction of Permanent Bench MarksAppendix M Location of Permanent Bench MarksAppendix N Flight Plan for Aerial PhotographyAppendix P Representation of Underground ServicesAppendix Q Schedule of Final DrawingsAppendix R Definitions for Digital DataAppendix S Feature Coding Scheme for Geodetic SurveysAppendix T Symbol Definitions for OutputAppendix U Data Integrity Validation

Volume 5 Section 1 Chapter 1Part 2 Introduction

1. INTRODUCTION

1.1 General

1.1.1 This specification is for the use of survey firmsengaged in work for the Department and for DesignOrganisation responsible for the administration of geodeticsurvey services.

1.2 European Mutual Recognition

1.2.1 Except where the specified standard implements oris technically equivalent to a Harmonised European Standardor to a European Standard adopted for use within theEuropean Communities after 31 December 1985, anyrequirement for products or materials to comply with aBritish Standard shall be satisfied by compliance with

(i) a relevant standard or code of practice of anational standards institution or equivalent body ofany states of the European Economic Area.

or (ii) a relevant international standard recognisedin any states of the European Economic Area.

or (iii) a relevant specification acknowledged for useas a standard by a public authority of any states ofthe European Economic Area.

or (iv) traditional procedures of manufacture ofany states of the European Economic Area wherethese are the subject of a written technicaldescription sufficiently detailed to permitassessment of the goods or materials for the usespecified

or (v) a European Technical Approval (ETA)issued in accordance with the ConstructionProducts Directive 89/0106/EEC (or, untilprocedures are available for the issue of ETAs, aspecification sufficiently detailed to permitassessment) for goods or materials of an innovativenature or subject to innovative processes ofmanufacture and which fulfill the purpose providedfor by the specified standard.

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provided that the proposed standard, code ofpractice, specification, technical description orEuropean Technical Approval provides in uselevels of safety, suitability and fitness forpurpose equivalent to those required by thespecified standard in so far as they are notinconsistent with the Essential Requirements ofthe Construction Products Directive(89/106/EEC).

1.3 Changes and Amendments to theSpecification

1.3.1 This Specification is a reproduction of thatcontained in Volume 5 Section 1 Part 2 of the Manualof Contract Documents For Highway Works modifiedby the Substitute, Additional, Cancelled or AmendedClauses or Figures, listed in Clauses 1.3.5, 1.3.6, 1.3.7and 1.3.8 respectively.

1.3.2 Insofar as any Substitute, Additional orAmended Clause or Figure may conflict or beinconsistent with any provisions of the Specification,the Substitute, Additional or Amended Clause or Figureshall always prevail.

1.3.3 Any reference in the Contract to a Clause orFigure Number shall refer to any Substituted, Additionalor Amended version of that Clause or Figure within theContract. A list of Substituted, Additional or AmendedClauses or Figures will be found in Sections 1.3.5 -1.3.8.

1.3.4 Where the Specification requires options to bedeleted or details to be added, these shall be explicitlyidentified. This shall be performed by drawing a linethrough the options to be deleted and inserting inmanuscript items to be inserted, in both cases usingblack ink. Deletions and insertions shall not be madeby editing the text using a word processor or similardevice.

1.3.5 List of Substitute Clauses or FigureNumbers

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Chapter 1 Volume 5 Section 1Introduction Part 2

1.3.6 List of Additional Clauses or Figure Numbers

1.3.7 List of Cancelled Clauses or Figure Numbers

1.3.8 List of Amended Clauses or Figure Numbers

1.4 The Survey Contractor

1.4.1 Organisations considered for contracts under thisSpecification.

1.5 The Survey Advisor

1.5.1 The Survey Advisor is the Design Organisation'srepresentative for Geodetic surveys.

1.5.2 For each commission, a Survey Advisor shall beappointed who shall be a qualified and experienced LandSurveyor and who may be an employee of the DesignOrganisation or an employee of a survey contractor notinvited to tender. The Survey Advisor shall assist theDesign Organisation from the inception of the planningprocess by preparation of the detailed project surveyspecification. He shall also be responsible for providingadvice during the assessment of the tenders, providingsupport to the Design Organisation during the contractperiod and ensuring that the requirements of theSpecification are properly met in time and tolerance.

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Chapter 2Purpose and Scope

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2. PURPOSE AND SCOPE

2.1 LocationRoad Number(s) .......................................Area of survey...............................................................................................................................................................................Town ........................................................County(ies) ...............................................

2.2 Aim of the Project for which the Survey is Required...............................................................................................................................................................

2.3 Aim of the Survey

To carry out a Topographical Survey of the area shown on the Drawings to include the following:

Establish, locating and survey a framework of Permanent Ground Markers.Prepare plans at ..............................scales, with/ without contours.Prepare String Digital Models and/ or other digital information as detailed in the specification, Clause ..........Photograph the area in black and white to a scale of 1: ....... for a photographic mosaic.

2.4 Brief Description of Survey AreaSurvey area :Approx. Length ....................................km x Average Widt..................................mTerrain conditions for area of survey ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................Areas of special significance.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

2.5 Use of the Survey Information

The survey information will be used for the following purposes:

Feasibility study for: alignment/ earthworks/ landscape/ environmental/ other ............................................................................

Chapter 2Purpose and Scope


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Outline engineering and/ or landscaping plans ...........................................................................................................................

Compulsory purchase order, Highways Act /Roads (Scotland) Act and/ or land referenceplans .....................................

Base plans required for public display/ design/ other .............................................................

To provide information on noise calculations/ ground investigation .........................................

To provide geometric information on existing structures ........................................................


Chapter 3General Requirements

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3.1 Health and Safety at Work etc Act 1974

3.1.1 All activities performed during the course ofwork undertaken by the Survey Contractor on thisContract shall be in accordance with the requirementsof the Health and Safety at Work etc Act 1974. TheSurvey Advisor shall inform the Survey Contractor ofany operations or areas which involve safetyconsiderations over and above those normally requireduring survey activities.

3.2 Landowners, Occupiers and Entry

3.2.1 Unless otherwise stated in Appendix A, ownersand occupiers of all the land covered by the surveywill have been notified in writing of the period duringwhich entry is likely to be required and theirpermission for entry obtained by the DesignOrganisation or the Survey Advisor. Not withstandingthe above, the Survey Contractor shall also notify inwriting all occupiers before gaining entry and agreewith them all routes and means of access. Whereaccess to the Survey Contractor is refused, the SurveContractor shall immediately notify the SurveyAdvisor.

3.3 Control

3.3.1 A horizontal and vertical control frameworkshall be established by the Survey Contractor andsubmitted to the Survey Advisor for approval.Control points shall be marked in such a manner thattheir location shall allow effective future use. Theirconstruction shall be sufficient to withstand at least 5years of normal usage, taking into account thesurroundings at each location. The types of materialused shall be such that their impact upon theenvironment and any normal activities at each locationis minimised.

3.3.2 Connection to the Ordnance Survey NationalGrid, where required, shall be specified by the SurveyAdvisor before the start of the Survey, together withdetails of any Local Grid system required.

3.3.3 A Control Report shall be produced inaccordance with Clause 5, Project Control.

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.3.4 All survey control stations shall be referenced tourrounding detail and a location plan prepared by thurvey Contractor showing these references to permi

heir later re-establishment.

.3.5 The accuracy and density of the control shall bes defined in the appropriate Clause of thispecification.

.4 Detail to be Surveyed

.4.1 The nature and type of features to be surveyedill depend upon the scale of the survey and theurpose for which the survey information is required.ists of features, which the Survey Advisor shall mark

o show those required for this survey, are contained he appropriate Clause of this Specification.

.4.2 Where features cannot be surveyed to thepecified accuracy without extensive clearing ofegetation or obstructions the instructions of theurvey Advisor shall be obtained.

.4.3 Features shall be represented in accordance wihe feature symbol tables in Appendix B.

.4.4 The line or point to be surveyed on a featurehall be at the feature’s intersection with the groundurface unless otherwise required in the appropriatelause of this Specification or in Appendix B.

.4.5 Identification of all objects shall be based uponheir nature and surroundings. Where exactdentification is not possible, a general purposeescription shall be used.

.4.6 Any building or surface which is in a state ofhange at the time of the survey shall be annotated tohis effect, with the boundary of the area of changendicated. The Survey Advisor shall specify any areahere the degree of change is such that either limitedr no, survey information is required within the area.

.4.7 The ground surface shall be surveyed such thany point interpreted from this information shall beithin the tolerance specified of the actual groundurface location for the area and type of surfacenvolved. These tolerances are given in theappropriate Clause of this Specification.

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Chapter 3General Requirements


3.5 Presentation

3.5.1 All survey information shall be presented in aformat and manner which allows for easy use andwhich permits additional copies to be made asnecessary, excepting any limitations which may beimposed in respect of the copyright of data from thirdparties.

3.5.2 All final products from the source data shall besupplied on stable media. All products supplied shallbe intelligible and usable for the purpose specified.

3.5.3 Within two weeks of award of the Contract, theSurvey Contractor shall supply samples of the output,for approval by the Design Organisation within 10working days of the date of receipt.

3.5.4 On completion of the Survey, the SurveyContractor shall deliver to the Survey Advisor adetailed survey report, covering those items specifiedin the appropriate Clauses of this Specification. TheContract shall be considered to have been completedupon acceptance of the suitability of this report and ofall the survey data delivered and accepted.

3.6 General

3.6.1 Within two weeks of award of the Contract, theSurvey Contractor shall provide the Survey Advisorwith a detailed programme and method statement ofthe activities the Survey Contractor intends to carryout, in order to meet the Contract timetable and theSpecification. The method statement shall includecopies of calibration certificates for the surveyequipment.

3.6.2 The Survey Contractor shall conform with allrequirements of any private or public utility servicecompany involved as far as access to their facilities isconcerned. The Survey Advisor shall identify thosefacilities which can be inspected by the SurveyContractor and those which can only be inspected bythe statutory undertaker concerned.

3.6.3 The Survey Contractor shall ensure that writtenpermission is obtained from the Survey Advisor forany works which in the opinion of the SurveyContractor are likely to cause damage to property.

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.6.4 The Survey Contractor shall make provision toarry out any traffic safety and managementquirements necessary to undertake the Survey on

ublic roads in accordance with all relevant statutorygulations. Details of these requirements shall becluded in Appendix C.

.6.5 All source survey information shall be safelyeld by the Survey Contractor for a period of threeears from the date of completion of the Surveyontract. After this period it may then be destroyedithout reference to the Design Organisation orurvey Advisor unless otherwise instructed in Clause4.3.3.

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Chapter 4Project Information


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4. PROJECT INFORMATION

4.1 Client

4.1.1 Project Promoted by:-..........................................................Address:- .........................................................................

.........................................................................

.........................................................................

.........................................................................

4.2 Design Organisation

4.2.1 Project Administered by:-....................................................Principal Contact for the Survey:- ....................................Address:- .........................................................................

.........................................................................

.........................................................................

.........................................................................Position:- .........................................................................Telephone No:- ........................ Fax No:- ........................

4.3 Survey Advisor

4.3.1 Project Survey Advisor:-Name:- ...............................................................Organisation:- ..................................................................Address:- .........................................................................

.........................................................................

.........................................................................

.........................................Telephone No:- ....................... Fax No:- ....................

4.4 Existing Mapping

4.4.1 Existing mapping available for inspection:-Brief description and source:- ...........................................................................................................................................................................................................................................................................................................Scale:- .................................(Digital/Non Digital)Available from:- .......................................................Times:- .....................................................................

4.5 Existing Aerial Photographs

4.5.1 Existing aerial photographs available for inspection:-Brief description:- ..........................................................................................................................................................................................................Scale:- .....................................(Colour/Monochrome)Available from:- ..........................................Times:- .......................................................

Chapter 4Project Information



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4.6 Landowners and Occupiers

4.6.1 Landowners/occupiers have been notified of the following:-

a. Purpose and scope of survey ...........(Yes/No)

b. Expected period of survey and commencement date ...........(Yes/No)

c. Arrangements for survey marker way leaves ...........(Yes/No)

4.6.2 Land owner/occupier information:-

a. Schedule of owners/occupiers - See Appendix A.

b. Information to be obtained by the Survey Contractor and made available to the DesignOrganisation/ Survey Advisor ...........(Yes/No)

c. Other arrangements ............................

4.7 Access

4.7.1 Details of special access requirements in survey area - See Appendix D.

4.8 Restrictions

4.8.1 Details of restrictions to the survey programme - See Appendix E.

4.9 Contacts

4.9.1 Details of contacts in the Highway and Police Authorities, private and public utility service companiesand other Statutory Authorities in the area including British Rail - See Appendix F.

4.10 Traffic Safety and Management

4.10.1 Details of requirements for traffic safety and management - See Appendix C.

4.11 Services

4.11.1 Details of any known information on location of Public/Private services and supplies - See Appendix G.

4.12 Contract Drawings

4.12.1 Schedule of Contract Drawings - See Appendix H.


Chapter 5Project Control

5. PROJECT CONTROL
5.1 Project Control Requirements
5.1.1 Horizontal and vertical control frameworksshall be established to satisfy the following specifiedsurvey requirements:

a. Revision and/or upgrading of existing mappingas specified in Clause 6.

b. Production of new mapping as specified inClause 7.

c. Survey of key points as specified in Clause7.2.11.1 and shown on the Contract Drawingsin Appendix H.

d. Survey of existing structures as specified inClause 11.

e. Setting-out during construction.

f. Structural monitoring.

5.2 Planimetric Control

5.2.1 Framework

5.2.1.1 Planimetric control shall be made up of aframework to provide a suitable foundation for theproduction of a reliable survey. The framework shallcomprise of all of the following elements:

a. Primary points connected by directmeasurement and located at a nominal distanc1000 m or ...... m apart and not less than 500m or ...... m apart.

b. Secondary points tied into the primary pointsand located at a nominal distance of 250 m or...... m apart and generally not less than 100 mor ...... m apart.

c. Minor control points as required for mappingat the specified scale.

5.2.2 Location of Permanent Ground Markers

5.2.2.1 The primary and secondary control points

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hall be defined by permanent ground markers. Prioro installation the approximate locations of theermanent ground markers shall be defined in one of

he following ways:

. Marked on a set of plans by the SurveyContractor and submitted together with adiagram of the proposed control framework tothe Survey Advisor for approval.

. Marked on the Contract Drawings scheduled inAppendix H.

.2.2.2 Final positions of permanent groundarkers shall be determined by terrain and

ntervisibility constraints. Any position which differsubstantially from that defined in Clause 5.2.2.1 shalle subject to approval by the Survey Advisor.

.2.2.3 Minor control points shall not beermanently marked.

.2.3 Construction of Permanent Ground Markers

.2.3.1 Permanent Ground Markers shall betable for a period of 5/..... years and shall be of aonstruction which conforms to the types illustrated inppendix J.

.2.4 Survey Grid

.2.4.1 The planimetric control shall be related tone of the following:

. A plane rectangular grid with an origin definedby the nearest National Grid 10 km intersectionto the south-west of the survey area and withthe same orientation as the National Grid.

The origin of the plane grid shall be .......m Eand .......m N.

The origin values selected shall ensure that allsurvey grid co-ordinates are positive.

. An existing grid ...............................................................................................................

. An arbitrary plane local grid .............................................................................................

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5.2.4.2 A description of the grid system usedshall be defined on one of the following:

a. A key plan or data fileb. Each survey plan or data file

5.2.5 Accuracy Acceptance Criteria

5.2.5.1 The acceptance criteria specified beloware in terms of internal rather than absolute accuraciesand are given as permitted deviations for distances,angles and levels. Internal accuracies are more criticato the construction process than the absolute accuracyof points in a higher co-ordinate system.

5.2.5.2 The relation between the permitteddeviation (PD) and root mean square error (rmse) is:PD = 2.5 x rmse.

5.2.5.3 Where the control system forms anetwork, it shall be observed by measuring sufficientdistances and angles to obtain a redundant number ofobservations, which shall then be adjusted by a leastsquares method.

5.2.5.4 When comparing measured distances andangles with those derived from the adjusted co-ordinates the differences shall not exceed the followingpermitted deviations:

a. Primary Points

Distances: either ± 0.5√L mm or ± .... √L mmAngles: either ± 0.035 degrees or ± .... degrees √L √LAs an offset: either ± 0.61√L mm or ± .... √L mm

b. Secondary Points

Distances: either ± 0.75√L mm or ± .... √L mmAngles: either ± 0.045 degrees or ± .... degrees √L √LAs an offset: either ± 0.75√L mm or ± .... √L mm

c. Minor Control

Distances: either ± 1.0√L mm or ± .... √L mmAngles: either ± 0.09 degrees or ± .... degrees

√L √LAs an offset: either ± 1.5√L mm or ± .... √L mmwhere L is the distance in metres between the pointsconcerned. In the case of angles, the shorter of the twodistances defining the angle shall be used.

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2.6 Schedule of Permanent Control Stations

2.6.1 A schedule shall be prepared giving thellowing information:

a. Station designationb. Plan co-ordinatesc. Level value (where available)d. Descriptione. Ordnance Survey triangulation stations

(if used)

2.7 Location Diagrams

2.7.1 A location diagram shall be prepared forch permanent ground marker on a standard form, aample of which is shown in Appendix K.

2.8 Control Framework Diagram

2.8.1 A simple plan shall be prepared of theanimetric control framework showing the surveyednnections between the permanent ground markers.

3 Vertical Control

3.1 Framework

3.1.1 Permanent ground markers andrmanent bench marks (if required) shall bennected by levelling and adjusted to the datum benarks.

3.2 Location

3.2.1 The vertical control framework shall befined by the permanent ground markers of the

animetric network and the permanent bench marks e locations shown on the Contract Drawingsheduled in Appendix H.

3.3 Construction

3.3.1 Permanent bench marks shall be stabler a period of either 5/ ..... years and theirnstruction shall conform to the illustration given inpendix L.

3.4 Datum

3.4.1 All levels shall be related to one of thellowing:

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a. Ordnance Datum -Newlyn/Liverpool.

b. Other datum ..............................

5.3.4.2 The value of the datum bench mark towhich the survey is related shall be confirmed bycheck levelling to other existing bench marks.

5.3.4.3 The location, description and value ofeach datum bench mark used shall be quoted on onthe following:

a. A key plan or data fileb. Every survey plan or data file

5.3.5 Accuracy Acceptance Criteria

5.3.5.1 When comparing measured heightdifferences with those derived from the adjustedreduced levels, the differences shall not exceed thefollowing permitted deviations:

a. Between bench marks, primary stationsand other closed loops in the framework:either ± 12√K mm or ± .... √K mm, where Kis the distance levelled in km

b. Between adjacent secondary stations orminor control points less than 300 m or ...... apart: either ± 5 mm or ± ...... mm

5.3.6 Schedule of Bench Marks

5.3.6.1 A schedule shall be prepared giving thefollowing information:

a. Bench mark designationb. Level valuec. Descriptiond. Ordnance Survey bench marks (if

used)

5.3.7 Location Diagrams

5.3.7.1 A location diagram shall be prepared foreach datum bench mark and for each other permanebench mark on a standard form, an example of whicis shown in Appendix M.

5.3.8 Level Framework Diagram

5.3.8.1 A simple plan shall be prepared of thevertical control framework showing the levelled


connections between the bench marks.

5.4 Control Report

5.4.1 On completion of the fieldwork and adjustment,a comprehensive control report shall be prepareddetailing the methods used and checks applied, anyproblems encountered and demonstrating that theresults achieved are in compliance with thisSpecification.

5.4.2 An advance copy of the report, together withcopies of the horizontal and vertical control frameworkdiagrams, schedules of stations and bench marks, anstation and bench mark location diagrams, shall besubmitted to the Survey Advisor for his approval. Onapproval, this shall form part of the final report.

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Chapter 6Revision or Upgrading of Existing Mapping

6. REVISION OR UPGRADING OF EXISTINGMAPPING

6.1 Scale

6.1.1 Revision mapping is required at the followingscale(s):

a. 1:1250b. 1:2500c. 1:10,000d. Other .........................................

6.2 Area to be Surveyed

6.2.1 The areas to be surveyed at each scale shall beshown on the Contract Drawings scheduled inAppendix H.

6.3 Base Mapping

6.3.1 The base mapping shall be as follows:

a. National Grid series Ordnance Survey mapsb. Other .........................................

6.4 Source of Base Mapping

6.4.1 The source of the base mapping shall be asfollows:a. Supplied by the Design Organisationb. To be purchased/supplied by the Survey

Contractorc. Other .........................................

6.5 Base Mapping Source Medium

6.5.1 Drawings

6.5.1.1 The medium of the base mapping sourceshall be as follows:

a. Transparencyb. Positive filmc. Negative filmd. Sepiae. Published paper plansf. Other .........................................

...............................................

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.5.2 Digital

.5.2.1 The medium of the base mapping sourcehall be as follows:

. Magnetic tape - ¼”, for use on tape streamer.

. DOS disk - 3½”, 5¼”, High Density, DoubleDensity.

. Other.........................................

.6 Planimetric Detail to be Revised orUpgraded

.6.1 The planimetric detail to be revised or upgradedhall conform to that currently adopted by therdnance Survey with additions and deletions in

espect of 1:1250 and 1:2500 scale mapping asetailed in Clauses 6.7 and 6.8 respectively.

.7 Additional Details

.7.1 The additional details required at 1:1250 and:2500 scale shall be as specified below:

.8 Detail Not Requiring Revision

.8.1 The following details shall not be revised unlesspecifically required in Clause 6.7.:

. Parcel numbers and sizes

. County and administrative boundaries of anykind

. Changes or additions to house names andnumbers

. Minor detail within residential property, parksand ornamental gardens

. Individual trees

. Small details which are not relevant to thesescales such as guide posts, mile stones,boundary stones, troughs, etc

. High and low water marks

. Antiquities

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Chapter 6Revision or Upgrading of Existing Mapping


jor
i. Non-statutory footpaths and bridleways
j. Isolated buildings of less than 2 mm2 at mapscale

k. Building divisions in built up areas whichcannot be identified externally

l. Detail obscured or not clearly definable

m. Other.....................................................................................................................................

6.9 Planimetric Accuracy

6.9.1 The accuracy of the revision shall be the sameas that of the base maps used.

6.10 Height Information

6.10.1 Contours

6.10.1.1 Contours shall be required at the followingvertical intervals:

Map Scale Contour Interval1:1250 either 1 m or ..... m1:2500 either 2 m or ..... m1:10,000 either 5 m or ..... mOther ..... m

6.10.2Spot Heights

6.10.2.1 Spot levels shall be required on the maps atthe following locations:

a. At salient points such as hilltops, bottoms ofdepressions and saddles

b. Along the centre of all roads and publicaccesses at ...m intervals, road intersectionsand significant changes of gradient.

c. Along the centres of sets of railways at ..... mintervals

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At water level at the time of survey or ofphotography, along rivers, streams and mawatercourses at ..... m intervals

At any other positions indicated on theContract Drawings scheduled in Appendix H

Other ........................................................................................

11 Height Information Accuracy

11.1Contours

11.1.1 Contours shall be accurate to half thertical interval specified or to ..... m.

11.2Spot Heights

11.2.1 Spot heights shall be accurate to thellowing tolerances:

ap Scale Hard Surfaces Other Surfaces1250 ± 0.2 m or ± ..... m ± 0.3 m or ± ..... m2500 ± 0.3 m or ± ..... m ± 0.5 m or ± ..... m10000 ± 1.0 m or ± ..... m ± 1.6 m or ± ..... m



Chapter 7New Mapping

7. NEW MAPPING7.1 Scale

7.1.1 A survey shall be performed to produce newmapping at the following scales:

a. 1:1250b. 1:1000c. 1:500d. 1:200e. 1:100f. 1:50g. Other.........................................

7.1.2 The areas to be surveyed at each scale shall bas shown on the Contract Drawings scheduled inAppendix H.

7.2 Features/Detail to be Surveyed

7.2.1 Control Points

7.2.1.1 The following features and details shallbe surveyed:

a. Ordnance Survey trigonometrical stationsb. Permanent survey stationsc. Ordnance Survey bench marks used in the

surveyd. Permanent bench marksf. Other.........................................

7.2.2 Building/Structures


a. The plinth (or roof) line of all permanentbuildings

b. Open sides of buildingsc. Pre-fabricated housesd. Hutments, campse. Outbuildingsf. Garden shedsg. Glasshousesh. Covered passages and archwaysi. Internal property divisions between abutting

buildings where visible externallyj. Ruins or partially demolished buildings or

foundations - by the walls and masonry visiblat the time of the survey


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k. Names and numbers of all buildings, tradepremises or plots

l. Buildings under constructionm. Bridgesn. Overhangs and canopieso. Other.........................................

..............................................

..............................................

7.2.3 Boundary Features


a. Fences (showing type and height)b. Gatesc. Stilesd. Hedges - showing type, height and widthe. Walls - showing type, height and widthf. Boundary markersg. Other .........................................

..............................................

7.2.4 Roads, Tracks and Footpaths


a. Kerb line or edge of surfacing to carriagewaysb. Tracks and bridle pathsc. Rides and drivesd. Footwayse. Pedestrian crossingsf. Stepsg. Traffic islandsh. Paths in public groundsi. Paths in private groundsj. Tunnels and/or underpassesk. Changes of paved surface materialsl. Bridges and subwaysm. Other.........................................

..............................................

..............................................

7.2.5 Street Furniture and Visible Service Features


a. Call boxes - type identified, eg police, RAC,AA, etc


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b. Letter boxesc. Bus stopsd. Lamp postse. Telecommunication polesf. Electricity polesg. Vent pipesh. Road signsi. Road and street name boardsj. Hoardingsk. Notice boardsl. Traffic signal and control boxesm. Vehicle detector padsn. Drains or gullieso. Fire hydrantsp. Stop valves and stop cocksq. Manhole and inspection coversr. Covers or lights to cellarss. Parking meters and ticket machinest. Barriersu. Bollardsv. Marker Postsw. Other.........................................

..............................................

..............................................

7.2.6 Railways

7.2.6.1 The following features and details shall besurveyed:

a. Gauge faces of railway running railsb. Points and cross-oversc. Level crossingsd. Bufferse. Platformsf. Bridgesg. Signal boxesh. Signalsi. Telephone pointsj. Height gaugesk. Overhead electrification gantries - with

heightsl. Tunnelsm. Air shaftsn. Water troughso. Warning signsp. Cable troughs and runsq. Point/signal operating rods/wiresr. Other.........................................

..............................................

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2.7 Water, Drainage and Coastal Features

2.7.1 The following features and details shall besurveyed:

a. Lakesb. Pondsc. Reservoirsd. Riverse. Streamsf. Water coursesg. Ditchesh. Canals and towpathsi. Wellsj. Springsk. Marshesl. Locksm. Aqueductsn. Water towerso. Culvertsp. Millracesq. Syphonsr. Sluice gatess. Weirst. Waterfallsu. Fordsv. Mooring postsw. Pumpsx. Troughsy. Tanksz. FountainsA. Sewer outfallsB. Piers, jetties and landing stagesC. Harbour walls and breakwatersD. Groynes and sea defencesE. TunnelsF. Hydraulic ramsG. The direction of flow of all rivers,

streams and cater coursesH. Other.........................................

..............................................

2.8 Slopes and Earthworks

2.8.1 The following features and details shall besurveyed:

a. Cuttings and embankmentsb. Terraced slopesc. Retaining wallsd. Moundse. Open pitsf. Quarries

April 1996OR USE OUTSIDE THE AGENCYONIC DOCUMENT ARE UNCONTROLLED



g. Rock outcropsh. Tipsi. Adits and mineshaftsj. Other .........................................

7.2.9 Woods, Trees and Recreation Areas


a. Playgrounds and sports facilitiesb. Parks and open spacesc. Trees and Woods

(i) Details of species, girths/diameter(measured 1 m above the ground), height anspread (drawn) of all trees greater than....m girth shall be supplied and plotted toscale.

(ii) Isolated trees above ..... m trunkdiameter

(iii) Individual trees above ....m trunkdiameter in wooded areas.

(iv) Tree count with average girth, heightand spread in wooded areas.

(v) Canopy line to be plotted.

(vi) Staked saplings - individual and/orareas thereof to be plotted.

(vii) Schedule of trees.

d. Ornamental garden features....................e. Other........................................

7.2.10Industrial


a. Tanksb. Conduits and pipesc. Valve chambersd. Filter bedse. Transformers (boundary fences only)f. Electricity sub-stations and switch boxes

boundary fences only)g. Pylon bases and reference numbersh. Overhead lines and cablesi. Flagstaffs and masts

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d

j. Gas storage vessels and pipesk Other .........................................

7.2.11Key Points

7.2.11.1 The planimetric co-ordinates of the keypoints shown on the Contract Drawings scheduled inAppendix H shall be surveyed to the accuracyspecified in the appropriate Clause of thisSpecification.

7.2.12Spot Levels

7.2.12.1 The spot levels of the following featuresshall be surveyed:

a. Pavements, kerbs, channels and centre-line ofroads at ..... m intervals between cross-sections

b. Steps and ramps (top and bottom)

c. Corners of buildings and other structures

d. Floor levels of buildings (or, wheninaccessible, threshold levels which shall beclearly annotated)

e. Railway lines (highest rail/both rails at ..... mintervals)

f. Centre of railways at sleeper level at ..... mintervals

g. Hilltops, depressions and saddles

h. Top and bottom of embankments at ..... mintervals

i. Ditches, outfalls, stream, culverts and drainsincluding bank and bed/invert levels at ..... mintervals

j. Water levels (with date of survey) of rivers,streams, water courses, canals, ponds, lakesand reservoirs, and where applicable, floodwater levels

k. Storm water gullies, manholes, inspectioncovers, ducts and conduits

l. Heights of overhead cables (specify)..........

m. At additional locations indicated on theContract Drawings scheduled in Appendix H

n. Other .........................................

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7.3 Accuracy

7.3.1 The planimetric co-ordinates of directlysurveyed points shall be correct to ± ..... m rmse oncarriageways and hard surfaces, and ± ..... m rmse onother surfaces, when checked from the nearest contropoint.

7.3.2 The levels of directly surveyed points shall becorrect to within ± ..... m rmse on carriageways andhard surfaces, and to within ± ..... m rmse on othersurfaces, (except on ploughed or otherwise brokensurfaces), when checked from the nearest controlpoint.

7.3.3 Features which cannot be surveyed to thespecified accuracy without extensive clearing shall betreated in one of the following methods:

a. Surveyed approximately and annotated/labelled accordingly.

b. Cleared by, or with the authority of, theSurvey Advisor or Design Agent.

7.3.4 The co-ordinates of key points as defined inClause 7.2.11 shall be accurate to within ± ..... m rmswhen checked from the nearest control point.

7.4 Definition

7.4.1 The spacing of points on planimetric featuresshall be such that interpolated points are correct towithin ± ..... m on hard or well-defined features, and towithin ± ..... m on other features.

ALTERNATIVELY

The spacing of points on planimetric features shall besuch that the straight line joining any two adjacentpoints on a feature shall not deviate from the trueposition of that feature by more than ± ..... m on hardor well-defined features, and by more than ± ..... m onother features.

ALTERNATIVELY IN EITHER OF THE ABOVE,..... could be replaced by more than twice the accuracspecified in Clause 7.3.1.

7.4.2 The spacing of levels shall be such that theground configuration, including all discontinuities, iscorrectly represented except for minor features such a

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mall banks and ditches which are insignificant inrms of earthworks quantities.

.4.3 The spacing of levels shall be such thatterpolated points shall not deviate from the trueround surface by more than ± ..... m on hard or well-efined surfaces, and by more than ± ..... m on otherurfaces.

.5 Presentation

.5.1 The presentation of surveyed information shalle as defined in Clause 12.7.



Chapter 8Aerial Photography

8. AERIAL PHOTOGRAPHY

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8.1 Purpose of Photography

8.1.1 The photography shall be of an image andgeometric quality suitable for the following purposes:

a. Photogrammetric mapping

b. Photomosaics

c. Orthophoto mapping

d. General interpretation

e. Other .........................................

8.2 Type of Photographic Coverage

8.2.1 The type of photographic coverage shall be asfollows:

a. Stereoscopicb. Monoc. Obliqued. Other .........................................

8.3 Area

8.3.1 The areas to be surveyed at each scale shall beas shown on the Contract Drawings scheduled inAppendix H.

8.4 Scale

8.4.1 The nominal scale of the photography shall notbe smaller than the following:

1:..... for 1:..... scale mapping1:..... for 1:..... scale mapping1:..... for 1:..... scale mapping1:..... for 1:..... scale mapping1:..... for 1:..... scale mapping

8.5 Direction of Flight Lines

8.5.1 The direction of flight lines shall be as definedin one of the following:

a. Selected by the Survey Contractor and a copyof the flight plan supplied to the DesignOrganisation.

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. Conform within normal flying standards to theflight plan detailed in Appendix N

. Other .........................................

.6 Type of Aerial Film

.6.1 The film used shall be as follows:

. Monochrome

. Colour

. Monochrome infra-red

. False colour infra-red

. Other .........................................

.7 Film Identification

.7.1 Photographic products shall contain a blockhowing the following information:

. Reference number or title of project

. Date and time of photography

. Altitude above sea level

. Number of optical unit

. Negative numberMean photographic scale

. Focal length

.8 Paper Prints

.8.1 Contact prints or proofs shall be made of gooduality materials and comply with one of thellowing:

. Materials on which ink and pencil can be useon both sides, samples of which shall havebeen approved by the Survey Advisor

. Other .........................................

.9 Diapositives

.9.1 Diapositives or transparencies shall be producn a stable base film, or as specified below:

. .................................................

.10 Duplicate Negatives

.10.1Duplicate negatives shall be supplied and beroduced in one of the following methods:

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Chapter 8Aerial Photography


a. With a wrong reading image when viewedemulsion up

b. With a right reading image when viewedemulsion up

8.10.2The duplicate negatives shall be produced on astable base film with tone reproduction (densitydistribution) to the same quality as the originalnegatives.

8.11 Camera

8.11.1The camera used shall be appropriate for thepurposes defined in Clause 8.1. The focal length ofthe camera shall be agreed with the Survey Advisor,prior to photography being undertaken.

8.11.2Where photography is to be used for mapping, metric survey camera should be used, fitted with a lenthat is designed to give a residual radial distortion notgreater than 15 mm within 100 mm of the principalpoint. The film should be held in the intended imageplane during exposure, to maintain sharp focus andhold image distortion so that the original negative orcontract diapositives produced from them does notcontain residual y-parallaxes after relative orientationin excess of 20 mm anywhere in the model. The focalength of the camera should be agreed with the SurveAdvisor.

8.12 Filters

8.12.1The Survey Contractor shall select filters toprovide suitable tone reproduction, except where thefilters to be used are specified below:

a. .................................................

8.13 Flying Conditions

8.13.1Photography shall be taken at a solar altitudesuch that detail in shadow is acceptable.

8.13.2Where photography is an end product, it shallbe flown in conditions when the visibility does notsignificantly impair the tone reproduction in thenegative. Relevant detail shall not be lost as a resultof atmospheric haze or dust. The extent of lostcoverage shall comply with one of the following:

a. Photography shall be substantially free from

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cloud or smoke. Isolated areas of cloud orsmoke shall not be cause for rejection of thephotography provided the intended use is notimpaired

. Photography shall be completely free of cloudor smoke

. Other .........................................

.13.3Special conditions related to timing or seasonor photography shall be as specified below:

. .................................................

.14 Materials to be Delivered

.14.1Film Negatives

.14.1.1 All films exposed on the Survey Contracthall be dealt with as follows:

. Delivered to the Survey Advisor

. Delivered to the Design Organisation

. Stored by the Survey Contractor

.14.2Other Materials to be Delivered

.14.2.1 The following materials shall be delivered:

. An index plot at 1:...... scale supplied in theform of:

(i) ...... sets of transparencies(ii) ...... sets of negatives(iii) ...... sets of paper prints(iv) Other ...............................

. ...... sets of contact prints or proofs

. ...... sets of duplicate negatives

. One copy of all film reports

. Other .........................................



Chapter 9Surveys for Noise Evaluation

9. SURVEYS FOR NOISE EVALUATION

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9.1 Area to be Surveyed

9.1.1 The areas to be surveyed shall be as shown onthe Contract Drawings scheduled in Appendix H.

9.2 Building Levels

9.2.1 Individual buildings and groups of buildings tobe surveyed shall be represented by simplified blockson the Contract Drawings. Levels shall be taken at tfollowing points relative to these blocks and theirpositions recorded on the Survey Drawings.

a. Ground levels at each of the block corners

b. Ground levels at intermediate distances of..... m along the block faces

c. Ground levels at other locations along theblock faces as shown on the ContractDrawings scheduled in Appendix H

d. The eaves and highest roof (ridge/parapet)level at each end of the block and at thepositions specified in b. and c. above

9.3 Roof Types

9.3.1 Types of roofs shall be identified by the SurveyContractor as typical of the simplified block (pitched,gable end, hipped end, flat roof etc) and recorded onthe Survey Drawings.

9.4 Representative Ground Levels

9.4.1 Representative ground levels, shall be taken asnear as possible to the locations shown on the ContrDrawings scheduled in Appendix H. Final positions othese ground levels shall be recorded on the SurveyDrawings.

9.5 Accuracy

9.5.1 Levels shall be accurate to ± 0.15 m rmse or± ..... m.


9.6 Presentation

9.6.1 The results of the spot height level survey fornoise evaluations shall be presented in the mannerdetailed in Clause 12.8.


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Chapter 10Underground Services

10. UNDERGROUND SERVICES

10.1 Area of Investigation

10.1.1The area to be investigated shall be one of thefollowing:

a. The whole of the area covered by the SurveyContract

b. The specific areas shown on the ContractDrawings scheduled in Appendix H

10.2 Investigation Requirements

10.2.1The investigation shall be carried out using oneof the options given in Clause 10.3. All investigationsshall be confined to mains services, except for thefollowing:

a. ...............................................

10.3 Types of Survey

10.3.1 From Service Records

10.3.1.1 This shall comprise the addition of utilityservices record information and local authoritydrainage, relating information where possible tocommon detail, services ‘furniture’, trench scars andoverhead lines.

10.3.2 From Service Records and On-Site VisualInvestigation

10.3.2.1 This shall include the requirements of Clause10.3.1, together with the lifting, where permissible, ofall services covers except where damage to cover orframe would result, and identifying the contents ofchambers. Service runs shall be assumed to bestraight. Additional requirements shall be as follows:

a. Drainage

(i) Measure all invert and backdropdepths

(ii) Show all pipe sizes and direction offlow

(iii) Link manholes by proving connection

b.

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(iv) Show all connections at manholes

Other services

(i) Relate chamber contents to recordinformation

(ii) Relate record information as in a.above

.3 From Service Records, On-Site Visualstigation and Route Tracing

.3.1 This shall include the requirements ofses 10.3.1 and 10.3.2, together with theing:

Drainage

(i) Determine outlets to manholes

(ii) Electronically trace the actual route

(iii) Locate concealed manhole positions

(iv) Electronically trace pumping mainand show depths at ..... m intervals

Water and Gas (including LPG)

(i) Electronically trace all detectablewater and gas mains

(ii) Show depths at ..... m intervals onmains

(iii) Provide sizes from(i) records(ii) visual site investigation(iii) excavation

Electricity(i) Electronically trace all high medium andlow voltage cables, street lighting, controlcables, etc

(ii) Provide depths of cables at ..... mintervals

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Chapter 10Underground Services


d. Telephones(i) By arrangement with the relevant

utility company, electronically traceall cable routes

(ii) Show depth to top of ducts at jointboxes and the number of ducts

e. Other services or structures(i) Electronically trace route of ..........

...............................................

(ii) Show depth at ..... m intervals of............................................

10.4 Schedules and Reports

10.4.1Where information is based on records, aschedule shall be compiled showing the service, thecontact address, telephone and fax numbers, and thetitle, reference number, scale and date of the sourcedata. This shall be contained in Appendix G.

10.4.2All information obtained from records shall beannotated (R) on the final services drawings anddigital data files.

10.4.3A report shall be prepared on the investigationof the services. This shall include details of anyparticular difficulties encountered during the Surveyand any qualification regarding the accuracy of theinformation shown. A cautionary note shall beprovided on all final services drawings and digital datafiles detailing any limitations in the informationprovided concerning completeness and accuracy.

10.5 CCTV Surveys

10.5.1A CCTV survey shall be carried out on thefollowing services using colour/black and whitephotography:

a. All foul and storm water sewers in excess of..... mm diameter

b. Those sewers indicated on the plan providedwith the Contract Drawings scheduled inAppendix H

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. Jetting of sewers required prior to survey.

0.5.2 The following results shall be provided:

. .................................................

0.6 Presentation

0.6.1For presentation, services shall be grouped asndicated in Clause 12.6.1 and shown as indicated inable in Clause 12.7.1.

0.6.2The conventions, abbreviations, line types andther representational features to be used shall be

hose given in Appendix P.

April 1996R USE OUTSIDE THE AGENCYNIC DOCUMENT ARE UNCONTROLLED


Chapter 11Existing Structures

11. EXISTING STRUCTURES

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11.1 Location

11.1.1The structures to be surveyed shall be shown onthe Contract Drawings scheduled in Appendix H. Thebrief names and descriptions of the structures are asfollows:

11.2 Detail to be Surveyed

11.2.1The existing structures shall be surveyed for thefollowing:

a. Plans at .......... scaleb. Sections at .......... scalec. Elevations at .......... scale.

11.2.2The following features and defects shall besurveyed:

a. Features ................................b. Defects ................................

11.3 Dimensions

11.3.1The following items shall be dimensioned.a. Spansb. Headroomsc. Clearances

11.3.2Dimensions shall be correct to ± ..... mm.

11.4 Spot Levels

11.4.1Spot levels shall be surveyed at those pointsindicated on the Contract Drawings scheduled inAppendix H. The location of control points shall beagreed with the Survey Advisor. The accuracy of spotlevels shall be ± ..... mm on hard or well-definedsurfaces and ± ..... mm on other surfaces.

11.5 Key Features

11.5.1Key features to be surveyed shall be specifiedby the Survey Advisor. The co-ordinates of keyfeatures shall be accurate to ± ..... mm, when checkedrelative to the control points agreed in Clause 11.4.

11

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Presentation

.1The presentation of survey information shall befined in Clause 12.9.

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Chapter 12Presentation of Drawings

12. PRESENTATION OF DRAWINGS

12.1 General

12.1.1The final drawings shall show all the surveyeddetails specified.

12.1.2Where digital data is specified the finaldrawings shall be produced by one of the following:

a. Entirely from the digital data fileb. Other .........................................

12.2 Drawing Format

12.2.1The layout of the survey drawings shall be asshown on the Contract Drawings scheduled inAppendix H.

12.2.2The Survey Advisor shall provide a sample ofthe title block and general arrangement to be used foall drawings.

12.2.3Adjoining drawings shall conform to one of thefollowing:

a. Butt jointedb. Overlapped by ..... mm with detail drawn to a

cut linec. Overlapped by ..... mm with all common deta

shown on both drawingsd. As shown in 12.2.1, where drawings do not

form a straight line

12.2.4Final drawings shall be drawn at the scale(s)and on the sheet size(s) specified in Appendix R.

12.3 Grid

12.3.1The grid shall be shown on all drawings at..... mm intervals by one of the following:

a. Continuous linesb. Symmetrical crosses at grid intersections with

ticks at the sheet edges

12.3.2The grid values shall be shown at the sheetedges.

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12.4 Revision/Upgrading of Existing Mapping

12.4.1Revised planimetric detail, additions and heightinformation as specified in Clauses 6.6, 6.7 and 6.8respectively shall be treated in one of the followingways:

a. Shown on the base mapping source mediumspecified in Clause 6.5.

b. Recompiled and shown as a strip survey of thearea specified in the Contract Drawingsscheduled in Appendix H. The strip shall beplotted in the top half of an ..... size sheet andorientated such that the proposed centre line isgenerally parallel to the sheet edge

c. Other .........................................

12.4.2Contours shall be plotted at ..... mm verticalintervals with every ....m contour shown as a doublethickness line. The value of the contours shall beshown at distances along the contour of not more than..... mm. Where contours are very close together,values shall only be shown on thickened contours.

12.4.3In flat areas where the distance betweencontours is likely to exceed ..... mm additional spotheights shall be shown at the following locations:

a. As indicated by the Survey Advisor on theContract Drawings scheduled in Appendix H

b. Other .........................................

12.5 New Mapping

12.5.1All surveyed detail specified in Clause 7 shallbe represented as specified in Clause 12.7.

12.5.2Contours shall be plotted at ..... mm verticalintervals with every ....m contour shown as a doublethickness line. The value of the contours shall beshown at distances along the contour of not more than..... mm. Where contours are very close together,values shall only be shown on thickened contours.

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Chapter 12Presentation of Drawings


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12.5.3In flat areas where the distance between conis likely to exceed ..... mm additional spot heights shbe shown at the following locations:

a. As indicated by the Survey Advisor on theContract Drawings scheduled in Appendix H

b. Other .........................................

12.7 Plan Presentation

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12.6 Underground Services

12.6.1Where drawings of underground services arrequired they shall be grouped as follows:

a. Each service shown on a separate sheet

b. All services shown on the same sheet

c. Building and Civil Engineering (B and CE)services (foul and storm water sewers, washown on the same sheet

d. Mechanical and Electrical (M and E) servic(gas, electricity, telecommunication, etc)shown on the same sheet

e. Other .........................................

12.7.1Levels, contours and underground services information shall be shown as follows:

Feature On detail sheet As separate In full tone on As overlaydrawing half tone detail

sheet

Levels

Contours

Services

............

12.8 Noise Evaluation

12.8.1Levels for noise evaluation shall be added tounmarked copies of the Contract Drawings specified inClause 4.12 at the positions stated in Clauses 9.2 and9.4.

12.8.2For clarity, levels shall be prefixed GL, EL orRL for ground level, eaves level and ridge (or roof)level respectively.

12.9 Existing Structures

12.9.1The plan position of the structure and any floorplans required shall show the features specified inClause 11.2.2.

FRO

12.9.2Elevations shall show the features and defectsspecified in Clause 11.2.2. They shall be clearlyannotated to describe the elevation.

12.9.3Sections shall be compiled from the plans andelevations. They shall be designated as Section A-A’etc and the line of the section shall be clearlyindicated on the plan.

12.9.4Dimensions, levels and coordinates of keyfeatures shall be shown on the plan survey andelevations as specified by the Survey Advisor.



Chapter 13Presentation of Digital Data

13. PRESENTATION OF DIGITAL DATA

13.1 Introduction

13.1.1 The supply of digital data can be relativelystraightforward, or potentially complex. This Clauseassumes the Design Organisation is obtaining data for anestablished modelling / CAD system, and that majorfacets of the design and implementation are thereforeexplicitly defined. Completion of the options in thisClause and in Appendix S which gives featuredescriptions shall satisfy this requirement. Where theDesign Organisation has developed its own system, or isnot using a pre-defined system, guidance is given onareas of relevance. Definitions used in this Clause aredefined in Appendix T.

13.2 Purpose of Data and Basic Data Structure

13.2.1 When digital data is the end product of a geodeticsurvey, the general requirement is for one or more ofthree purposes: a digital terrain model, a cartographicmodel, or a geographic model. While there isinformation common between the three models, it is oftenimpractical to contain all information in one data set.The model(s) required for this Project are as follows:..................................................................................................................................................................

13.3 Data Classification

13.3.1 Data Modelling

13.3.1.1 If the classification is not pre-defined by themodelling / CAD system in use by the DesignOrganisation, and selected for the supply of data, it willbe necessary to establish a data model. The basicrequirements of such a model and the associated recorddefinition are described in Appendix T.

13.3.2 Data Set Grouping

13.3.2.1 Subject to the physical constraints noted inClause 14.2, the transfer set shall be one of thefollowing:

a. A single logical data set containing all features

April 1996 ELECTRONIC COPY NOT FPAPER COPIES OF THIS ELECTRON

b. Supplied in ..... data set(s), the grouping of datafor each set being as identified in the Feature Code Tablein Appendix S.

13.4 Data Structure

13.4.1 Data Format

13.4.1.1 The data shall be compatible with one ofthe following:

a. Modelling / CADsystem ............................Version ....................................

b. Transfer / exchange format ............................Level ....................................Version ....................................

13.4.2 Geometric Definition

13.4.2.1 If features are not described by Clause 13.4, itwill be necessary to supply a data model and recorddefinition, the general requirements for which aredescribed in Appendix T. This shall include thefollowing:

a. Coordinates in metres to the accuracy defined inClause 3, GENERAL REQUIREMENTS.

b. Unique junction points

c. Crossing, or ‘T’ unique junction points betweensimilar features

d. A permitted level of data redundancy notexceeding ..... %

e. A distance between two adjacent points on thesame feature of not less than ..... metres, except where thepoints, such as short returns, are essential to accuratelydefine the shape.

f. A default text alignment either parallel to thegeneral alignment of the survey or East-West.

13.4.2.2 Height information which is not required asdiscrete surveyed points (spot heights), or is not a heightvalue of planimetric data, shall be defined as follows:

OR USE OUTSIDE THE AGENCYIC DOCUMENT ARE UNCONTROLLED

13/1

Chapter 12Presentation of Digital Data


a. Digital contours (continuous 2-D feature withheight attribute)

b. A digital terrain model with points at ..... metrespacing, normal to the nominal grid, with height suppliedin metres to ..... decimal places

13.5 Presentation

13.5.1 Data Representation

13.5.1.1 If presentation drawings are required, theproduct shall be defined in Clause 12, PRESENTATIONOF DRAWINGS.

13.5.2 Symbols

13.5.2.1 The symbol references shall be as defined in thefeature code table given in Appendix S.

13.5.3 Coverage

13.5.3.1 Each data set shall be one of the following:

a. A single logical data file, the limits of which coverthe survey area

b. A series of files with geographical boundaries asdefined in Appendix R.

13.6 Proofs

13.6.1 Any proofs required in this Clause are concernedwith completeness of the digital data and are only toexamine content, coding, etc.

13.6.2 Proof drawings or prints, which have not beenretouched, shall be made from each data set(s), in thegroups defined in the feature code table in Appendix S.Proofs shall be supplied on paper or other suitable media.

13.6.3 The Survey Advisor may require colours or extraplots to be produced to discriminate between the mainfeatures of each grouping. The data proofs may be eitherto any convenient sheet size or as defined in Appendix Q.

13.6.4 Overlaps and border information are not required.The project grid shall be plotted, and where relevant shallbe aligned to the National Grid. If several proof plots aresupplied, a simple index diagram shall be included.

1

1pCr

1Ooa

ELECTRONIC COPY NOT FOPAPER COPIES OF THIS ELECTRON

13/2

3.7 Data Integrity

3.7.1 There are three elements to data integrity;hysical, logical and data validity. Many modelling /AD systems validate some, or all of these elements on

eading data into the system.

3.7.2 Where this is not the case, the Designrganisation may find it appropriate to consider the usef validation software. Areas to be considered, if suchn option is adopted, are identified in Appendix U.

April 1996R USE OUTSIDE THE AGENCYIC DOCUMENT ARE UNCONTROLLED


Chapter 14Products to be Delivered

14. PRODUCTS TO BE DELIVERED

14.1 Drawings

14.1.1All transparencies, unless otherwise agreed bthe Survey Advisor, shall be supplied with the imageprinted in a positive form on dimensionally stablematerial with matt surfaces. They shall be produceeither by digital methods or by acceptable flat bedprocesses.


y

d

14.1.2Master transparencies shall be forward readingand plotted on material not less than ..... mm thick.Duplicate transparencies shall be reverse reading andplotted on material not less than ..... mm thick.

14.1.3The number of copies of drawings required shallbe as specified in the following table:

Preliminary drawings Final drawings

Advance transparencies

Master transparencies

Duplicate transparencies

Paper plots

Dyeline copies

a

14.1.4Two sets of proof plots of the final drawingsshall be sent to the Survey Advisor, who shall returnone set within ..... working days with any amendmentrequired to be incorporated in the final drawings.

14.1.5 The approved Final Drawings shall be retaineby the Contractor for a period of one year from theissue of the final certificate (Clause 31 Conditions ofContract), during which time they shall be madeavailable to the Survey Adisor on request. At the endof the one year period the Final Drawings shall bedelivered to the Employer unless otherwise directed.

14.2 Digital Data

14.2.1 Media Type

14.2.1.1 Data shall be supplied on the following:

a. Medium ........................................b. Size ........................................c. Capacity ........................................d. Compatible with operating system..............e. Version / revision ............................

O

t

s

d

14.2.2 Coverage

14.2.2.1 When writing data sets to the medium, thefiles shall comply with the following:

a. Span several volumes with the mediasequentially numbered

b. Not span the media volumes, the data filesbeing split as necessary with each containingcorrect headers and terminators

14.2.3 Annotation

14.2.3.1 Where multiple media and/or multiple datasets are supplied, the Survey Contractor shall supply list of all media, stating individual contents.

14.2.3.2 Each media item shall be individuallylabelled with the Project title, reference number, anddate. In addition each item shall be uniquelyreferenced in the form ‘Item 1 of 9’.

14.3 Final Report and Schedules

14.3.1The final report shall be typed and bound. Itshall describe the methods, techniques and equipmenused in the survey, the parameters used in thetransformation from the National Grid and the closingerrors in both the plan and level nets and in the


14/1

Chapter 14Products to be Delivered


connections to Ordnance Survey control. Where theOrdnance Survey control is proved to be out oftolerance the course of action agreed with the SurveyAdvisor shall be stated.

14.3.2 The report shall also include the following:

a. A schedule of PGMs showing referencenumber, National and local grid coordinate andlevel related to project datum

b. A schedule of PBMs showing referencenumber, level related to project datum andcoordinate to the nearest metre

c. Station descriptions of all PGMs and TBMsshowing the type of marker, a location sketchwith reference to permanent points of detail,coordinate and level

d. A diagram of the plan control showing allconnections within the net and to OrdnanceSurvey control (if used) with an indication ofthe accuracy of closures

e. A diagram of level control showing allconnections between PGMs, TBMs andOrdnance Survey Bench Marks (if used) withmisclosures

f. Copies of Ordnance Survey TriangulationStation descriptions for all stations used in thesurvey

g. Copies of Ordnance Survey Bench Mark listsshowing Bench Marks used, missing, damagedor out of tolerance

14.3.3All source survey information shall be safelyretained by the survey contractor for a period of three/..... years from the date of completion of the contract.


14/2


Chapter 15References


15. REFERENCES

15/1

1. Health & Safety at Work etc Act 1974.

2. Construction Products Directive. (89/106/EEC).

3. BS EN 471 : 1994 - British Standards InstitutionSpecification for high visibility wartning clothing.

4. Traffic Safety and Control (Traffic Safety) Measures - Chapter 8 of the Traffic Signs Manual.

BIBLIOGRAPHY

1. National Joint Utilities Group (NJUG) - Quality Control Procedures for Large Scale Ordnance Survey Mapsdigitised to 1988. NJUG Publication No13



APPENDIX A

A/1

SCHEDULE OF LANDOWNERS AND OCCUPIERS

Reference Drawing Numbers ...........................................................................................................................

Plot number Name, address and telephone Status Permission to enter landnumber given to/date

Appendix A



TABLE OF FEATURE SYMBOLS

B/1

Appendix B



B/2

Appendix B



REQUIREMENTS FOR TRAFFIC SAFETY AND MANAGEMENT

Traffic Safety and Control (Traffic Safety) Measures

“When surveying work is being carried out on or close to an existing highway, the Contractor shall displaysuitable warning signs in accordance with Chapter 8 of the Traffic Signs Manual”.

“Where work is carried out on or adjacent to a highway open to vehicles the Contractor shall ensure that thework force and site supervisory staff at all times wear high visibility warning clothing as specified in BS EN 471: 1994.

Road name and Special requirements Required byreference number

C/1

Appendix C



ACCESS REQUIREMENTS

Reference Drawing Numbers .........................................................................................................

Plot number Details of access requirements

D/1

Appendix D



RESTRICTIONS TO THE SURVEY PROGRAMME

Reference Drawing Numbers .....................................................................................................................

Plot Details of known restrictions to the survey programme Restrictionnumber required by

E/1

Appendix E



SCHEDULE OF CONTACTS

Organisation Address, telephone and fax numbers Name and position or rank of individual contacts

F/1

Appendix F



SCHEDULE OF EXISTING INFORMATION ON UNDERGROUND SERVICES

SERVICE AUTHORITY & ADDRESS DRAWING NUMBERS & REMARKS

NOTES:Information obtained from records should be treated with caution and further investigation is advised.

In the absence of evidence to the contrary the routes of confirmed connections between manholes areassumed to be direct.

Underground services plotted from existing records are clearly identified on the plan. The sources of theinformation are listed above.

G/1

Appendix G



SCHEDULE OF CONTRACT DRAWINGS

Drawing number Title of drawing

H/1

Appendix H



40 mm dia Aluminium disc withcentre hole to suit road pindiameter

Pin surrounded by 200mmsquare of white paint onpaved surface.

white paintroad pin

aluminiumdisc

CROSS SECTIONFULL SIZE

PLANFULL SIZE

Road Pin100 mm

min

Fig. 1

PERMANENT GROUND MARKER TYPE 1(FOR DENSE, VERY STABLE PAVED SURFACES)

CONSTRUCTION OF PERMANENT GROUND MARKERS

J/1

Appendix J



10mm projection to ground level

PLAN1/10 SIZE

Fig. 2

PERMANENT GROUND MARKER TYPE 2(FOR NON AGRICULTURAL SITES AND

UNPAVED SURFACES)

CROSS SECTION1/10 SIZE

0.10m

Concrete backfilland collar withtrowelled surface.

max 0.60mmin down torock level.

20mm rustresistant steelrod marked withcentre punchmark at top.

0.30m

0.50m

0.50m

max. 1.20m mindriven to refusal

CONSTRUCTION OF PERMANENT GROUND MARKERS

J/2

Appendix J (contd)



PLAN1/10 SIZE

Fig. 3

PERMANENT GROUND MARKER TYPE 3(FOR AGRICULTURAL SITES)


Extension length to be left in positionuntil instructed to be removed and handedto Survey Advisor. Hole to be backfilled.

Brightly coloured detachableprotective cap.

Concrete collar(not required for driven tubes)

Approx. 50mm I.D. steeltube driven (or placed) todepth shown, extendableby continuity connection toprecise location verticallyabove the driving point atground level.

Approx.50m I.D.

0.20m

1.20m

0.60m

0.60m

J/3

Appendix J



Fig. 4PERMANENT GROUND MARKER TYPE 4

(FOR SOFT SURFACES)

Steel or Alloy tube

Groundsurface

optional concrete collar

The illustration shown is diagramatic only and is notintended to refer to any particular proprietary type.

fine mark cross

J/4

Appendix J (contd)



LOCATION OF PERMANENT GROUND MARKERS

PERMANENT GROUND MARKER RECORD SHEET Page of

Location: Contract No:

PGM No./ Name

Description of PGM

Arbitrary/ N.G. Coords E N Ht

Detailed Location Diagram

Marker Established by..................................... Date.....................................................

Record Prepared by ....................................... Date.....................................................

Revisited by .............................................. Date.....................................................

Remarks

K/1

Appendix K



PLAN1/10 SIZE

Fig. 5

PERMANENT BENCH MARK TYPE 1(FOR MARLS, SILTS AND GRANULAR SUBSOILS)


Brightly coloureddetachableprotective cap

Projection up toground levelmax 0.05m

Plastic barspacer topositioninner rod

100mm I.D.rust resistantsteel pipe(sleeve)

20mm dia.rust resistantsteel rod with0.10m long 'T'bar 10mm dia.welded to end

Soil backfill

Top of inner rodtrimmed smoothand level.

Concrete collarwith trowelledsurface

0.50m

0.50m

0.50m

0.10m

0.20m

20mm

0.20m

0.20m

Wood or metal discto support outer

steel pipe

Concrete backfill

max 1.50mmin down to

rock level

CONSTRUCTION OF PERMANENT BENCH MARKS

L/1

Appendix L



CONSTRUCTION OF PERMANENT BENCH MARKS

L/2

Appendix L (contd)

PLAN1/10 SIZE

Fig. 6PERMANENT BENCH MARK TYPE 2

(FOR HEAVY CLAY SUBSOILS)


Brightly coloureddetachableprotective cap

Projection up to groundlevel max 0.05m

Plastic barspacer topositioninner rod

100mm I.D.rust resistantsteel pipe(sleeve)

20mm dia. inner steel rod

Soil backfill

Top of inner rodtrimmed smoothand level.

Concrete collarwith trowelledsurface

0.50m

0.50m

0.50m

0.10m

0.20m

20mm

0.20m

Wood or metal *disc to supportouter steel pipe

max 1.50mmin down to

rock level

max 1.50mmin drivento refusal.

Note*= rust resistant

*

*



LOCATION OF PERMANENT BENCH MARKS

PERMANENT BENCH MARK RECORD SHEET Page of

Location: Contract No:

PGM No./ Name

Description of PGM

Arbitrary/ N.G. Coords E N Ht

Detailed Location Diagram

Marker Established by..................................... Date.....................................................

Record Prepared by ....................................... Date.....................................................

Revisited by .............................................. Date.....................................................

Remarks

M/1

Appendix M



FLIGHT PLAN FOR AERIAL PHOTOGRAPHY

N/1

Appendix N



REPRESENTATION OF UNDERGROUND SERVICES

CONVENTIONS

Where the Design Organisation or Survey Advisor is responsible for compiling the schedule of undergroundservices, the linestyles and abbreviations shall be depicted in the following manner:-

Drainage (Foul) > Drainage (Storm) >

Water Main (Fresh) O/H

Water Main (Fresh) U/G Water Main (Salt) O/H SWWater Main (Salt) U/G SW

Central Heating O/H CHCentral Heating U/G CH

Hydraulic Main O/H HHydraulic Main U/G H

Gas Main O/H GGas Main U/G G

Compressed Air O/H CACompressed Air U/G CA

Fuel Pipe O/H FPFuel Pipe U/G FP

Steam Pipe O/H SSteam Pipe U/G S

British Telecom O/H TBritish Telecom U/G T

Electricity Cable O/H √Electricity Cable U/G √

P/1

Appendix P


ABBREVIATIONS

Appendix P

AAV Automatic air valve

Abnd Abandoned

(AC) Assumed connection

AC Asbestos cement

a/g Above ground

AG Air grating

AGL Airfield ground lighting

ALK Alkathene

(AR) Assumed route but provedconnection

AV Air valve

B Bollard

B&CE Building & civilengineering

BB Belisha beacon

Bd Backdrop

BIG Back inlet gully

BL Bed level

BT British Telecom

CA Compressed air

CC Control cable

CCTV Closed circuit television

CE Cleaning eye

CH Central heating

CI Cast iron

CJ Cable joint

CL Cover level

CM Cable marker (low Cable on wall)

CP Catch pit

CPP Cathodic protection point

ELECTRONIC COPY NOT PAPER COPIES OF THIS ELECTR

P/2

CR Cable riser

Cul Culvert

CV Control valve

CWS Cold water service

d Approx depth of service

D Diesel

DFL Duct floor level

DH Divisional hydrant

DI Ductile iron

dis Disused

DL Duct level

DLB Disused light base

DM Domestic main

DP Downpipe

DrC Drainage channel

DSS Distribution sub- station

DT Disconnection trap

ECM Electric cable marker

ECP Electric cable pit

ECR Electric cable riser

EDB Electric distribution board

EH Escape hatch

EHV Extra high voltage

EL Effluent level

EM Electricity meter

EP Electric pole

EPT Earthing point

ER Earthing rod

April 1996FOR USE OUTSIDE THE AGENCYONIC DOCUMENT ARE UNCONTROLLED

Volume 5 Section 1Part 2 Appendix P

ABBREVIATIONS (Cont’d)

ET Electronically traced

EWS Emergency water supply

FA From above

FA Fire alarm

FAI Fresh air inlet

Fb From below

FD French drain

FFP Fuel fill point

FH Fire hydrant

FHO Fuel hydrant outlet

FHPM Fuel high point marker

FL Floor level

FLt Flood light

FLM Fuel line marker

FLPM Fuel low point marker

FM Fire main

FP Feeder pillar

FPR Fuel Pipe riser

F&R Flow & return

G Gully

GC Gas cock

GM Gas meter

GP Gully pot

GPP Gas protection point

GPR Gas pipe riser

GS Gas syphon

GT Grease trap

GV Gas valve

HB Hand basin

HBL Hatch box level

HD Heating duct

April 1996 ELECTRONIC COPY NOT FPAPER COPIES OF THIS ELECTRO

HL High level

HP Heating pipe

ht Height

HV High voltage

HW Head wall

HWS Hot water service

IC Inspection chamber

IL Invert level

IT Interceptor trap

K Kerosene

KO Kerb outlet

L Light

LB Link box

LD Land drain

LDU Link disconnecting unit

LH Lamp hole

LHP London hydraulic power

LL Low level

LP Lamp post

LPG Liquid petroleum gas

LV Low voltage

MC Mercury Communications

M&EE Mechanical & Elect Eng

MH Manhole

Mkr Marker

NFI No further information

NIC Not in commission

o/h Overhead

OL Obstruction light

OT Oil trap


P/3

Volume 5 Section 1Part 2Appendix P

ABBREVIATIONS (Cont’d)

Pd Depth to top of pipe

PDC Power distribution console

Pe Polyethylene

PE Pot end

POL Petrol oil lubricants

PP Pressure point

PR Pipe riser

PRV Pressure reducing valve

PVC Polyvinyl chloride

(r) From records

Rad Radiator

RE Rodding eye

RG Road gully

RMU Ring main unit

RWP Rain water pipe

RWS Rain water shoe

RV Reflux valve (non return)

SA Soakaway

SC Stop cock

SD Sump depth

SE Side entry

SI Spun iron

SL Sump level

Sof.D Soffit depth

Sof.L Soffit level

SP Stand pipe

Spr Sprinkler

ST Stop tap

StB Strobe beacon

StL Strobe light

SV Sluice valve

ELECTRONIC COPY NOPAPER COPIES OF THIS ELEC

P/4

SWG Switchgear

Ta To above

Tb To below

Tc Depth to top of cables

TCR Telephone cable riser

Td Depth to top of duct

TL Traffic light

TP Telephone pole

Trans Transformer

u/c under construction

u/g underground

UPVC Unplasticised PVC

(UTL) Unable to lift without damage

(UTT) Unable to trace

V Vent

(VI) Verbal information

VP Vent pipe

WD Way duct

WL Water level

WM Water meter

WO Wash out

WP Waste pipe

WPR Water pipe riser

WTK Water tank

April 1996T FOR USE OUTSIDE THE AGENCYTRONIC DOCUMENT ARE UNCONTROLLED



SCHEDULE OF FINAL DRAWINGS

Schedule of Drawings, Scales & Sheet Sizes

SCALE SHEET SIZE REMARKS

1/xxxx Ax (xxxxmm.xxxxmm)

OR

Sheet Size:-

xxxmm

xxxmm

xxxmm

xxxmm

xxxxmm

Q/1

Appendix Q



DEFINITIONS FOR DIGITAL DATA

This Appendix concerns the transfer of digital data from the Survey Contractors system. To avoid ambiguity,the following definitions shall apply.

Attribute

Characteristics and/or descriptions attached to a feature. A feature may have none, or many attributes.

Cartographic Model

A data set, the primary requirement of which is to produce a graphic output. Coding is often limited toinformation for drafting purposes, such as line or symbol type, and often includes data such as grid and border,titles etc.

Clean Data

A data set with unique junction points.

Data Set

A part of a transfer set which may be homogeneous (ie a noise survey data set), or a geographical subset.

Digital Ground or Terrain Model (DGM or DTM)

A data set usually representing the ground surface (ie ‘bare earth’, excluding buildings). The model is most oftendefined by a regular grid of ‘posts’, each of which has a height. Additional data may include break lines to recordheights for definite changes of slope.

Feature

A point or line defined by two or three dimensional coordinates. By definition, a point has no dimensions but mayrequire an orientation and/or scale attribute for output as a symbol. Curves are features defined by a series ofstraight lines, or a series of points with a regular or complex curve attribute.

Field

A field is a unique unit of data, eg a height coordinate field.

Geographic Model

A data set which explicitly includes the relationships (topology) associated with the geometry. It will sometimesinclude attributes which are not spatial (ie ownership). This form of model is most suitable for analysis in ageographical information system.

R/1

Appendix R



Headers and Terminators

The first and last records of a data set. They usually contain information to explicitly identify the start and finishof a data set.

Null Height

A height entry which is interpreted as no value. Usually an impossible value such as -999 m.

Record

A logical group of fields which is written with a terminator character.

Symbol

A graphic representation of a feature (usually a point). Not usually inherent in the data themselves, but a resultof interpretation by the processing software and/or definition by the user.

Transfer Set

The complete data for the project, including supporting information.

Unique Junction Points

Clean data occur when any junction point has only one set of coordinates (2 or 3-D as appropriate): ie ingraphic terms there are no under- or over-shoots. Normally, points will only be added to create a ‘crossing’ or‘T’ junction where one would sensibly occur to complete a polygon (such as a fence and wall etc). A junctionwould be illogical between a river and fence, or an overhead line and road.

Volume

A physical item of media. A transfer set may be written to several volumes.

R/2

Appendix R



S/1

FEATURE CODING SCHEME FOR GEODETIC SURVEYS

The column of default codes may be amended to those preferred by the Survey Advisor, who may wish toconsider alpha or numeric codes, or both. Sample ‘default codes’ and ‘line / symbol defintions’ have beeninserted for a few examples only. The Survey Advisor should insert those codes he requires. The column of line/ symbol reference will also require setting to preferred options.

Notes for Completion

Columns 1, 2, 4, 5, and 6 shall apply unless explicitly amended.

If Groups (column 7) are not identified, all features will fall in Group 1, and will be supplied as a single logicaldata set.

Comments may be added in column 8.

The listing of a Feature description does not imply the data will be surveyed. Survey Contractors must examineClauses 6 and 7 to determine the requirements for a particular survey.

Column 1 2 3 4 5 6 7 8

Feature Description Default Structure Default Other Line/ Group CommentsCode Attributes Attributes Symbol ref

CONTROL POINTS

Ordnance Survey trigonometrical stations OSTS point RNPermanent survey stations PSST point RNOrdnance Survey bench marks used OSBM point RNSite bench marks BM point RNControl line, other than above CL lineControl point, other than above CP pointControl text CTXT text NS

Appendix S



Column 1 2 3 4 5 6 7 8


BUILDINGS AND STRUCTURES

The plinth line of buildings BLDG line W1,HTOpen sides of buildings OBLD line WI,HTRuins RUIN lineFoundations FNDN lineGlass houses and glass roofed extensions GLAS line HTPassageways PASS lineBuilding division BDIV lineOverhangs, roof line line NS(CL)Bridges line NS(CL)Headwalls and retaining walls line HTTunnels and subways lineNS(CL)Airshafts lineBuilding/structure line, other than above lineBuilding/structure point, other than above pointBuilding/structure text text

BOUNDARY FEATURES

Fences line HT,TYGates line,2 pointHT,TYStiles line,2 pointHedge centre line line WI,HT,TYLine Hedge extent, (hedge to right) line HT,TYWall centre line line WI,HT,TYWall face line HT,TYBoundary marker pointBoundary line lineBoundary feature line, other than above lineBoundary feature point, other than above pointBoundary feature text textKerb line to carriageway lineEdge of hard surface to carriageway lineChange of surface lineEdge of track or unsurfaced footpath lineEdge of hard surface to footway lineHighway centre line lineRoad markings lineRoad/track/footpath line, other than above lineRoad/track/footpath point, other than above pointRoads, tracks and footpaths text text

S/2

Appendix S (Contd)



Column 1 2 3 4 5 6 7 8


STREET FURNITURE AND VISIBLE SERVICE FEATURES

Call box lineLetter box lineBus stop pointLamp post pointTelecommunications pole pointElectricity pole pointVentpipe pointRoad sign line,2 points TXRoad and street name boards line,2 points TXHoardings lineNotice boards lineTraffic signals pointUtility cabinets lineVehicle detector pads lineDrains and gullies lineFire hydrant pointStop valve and stop cock covers lineManhole and inspection covers lineCovers or lights to cellars lineParking meters pointBarriers lineBollards lineMarker posts pointStreet furniture lines, other than above lineStreet furniture points, other than above pointStreet furniture text text

RAILWAYS

Gauge faces of railway running lines line GABuffers linePlatforms lineSignals lineTelephone points pointLoading gauge lineOverhead electrification gantries line CLWarning signs lineCable troughs and runs linePoint/signal operating rods/wires lineMile posts pointRailway feature lines, other than above lineRailway feature points, other than above pointRailway text text

S/3

Appendix S (Contd)



Column 1 2 3 4 5 6 7 8


WATER DRAINAGE AND COASTAL FEATURESEdge of lake, loch, pond or reservoir lineEdge of river lineEdge of stream, ditch lineEdge of watercourse lineEdge of canal lineWell lineSpring pointEdge of marsh lineCulverts lineSyphons lineSluice gates or lock gates lineWeirs lineFords lineMooring posts linePumps lineTrough lineTanks lineFountains lineGroynes and sea defences lineWater feature lines, other than above lineWater feature points, other than above pointWater feature text text

SLOPES, EARTHWORKS, SURFACE MODELTop and bottom of cuttings and embankments lineGround break lines (defining ground form) lineEdge of rock outcrop lineTop and bottom of cliffs lineContours lineSurface triangulation side line, 2 pointSpot levels pointSlope/earthwork feature line, other than above lineSlope/earthwork feature point, other than above pointSlope and earthwork feature text text

WOOD, TREES AND RECREATION AREAS

Tree trunk line GH,SP,HTTree and wood canopy lineFlowerbeds linePitch marking lineOther wood/tree/recreation feature line lineOther wood/tree/recreation feature point pointWood/tree/recreation feature text text

INDUSTRIAL FEATURES

Tanks linePipes, above ground lineValve chambers linePylon bases lineOverhead telecom cable lineOverhead electricity cable lineIndustrial feature lines, other than above lineIndustrial feature points, other than above lineIndustrial feature text line

S/4

Appendix S (Contd)



Column 1 2 3 4 5 6 7 8


CARTOGRAPHIC

Flow arrows (downstream) line, 2 pointMarsh symbols line, 2 pointGradient tadpoles (uphill) line, 2 pointCliff face symbol line, 2 pointLevel mark pointTree symbol point

TRANSPARENT FEATURES

Area seeds pointVirtual segments lineSurvey extent line

FEATURE CODES FOR MEASURED BUILDING SURVEYBUILDINGS AND STRUCTURES

Beams lineColumns lineWall faces, structural lineWall faces, non structural lineDoorways lineWindows lineParapets lineStep risers lineBuilding or structure line, other than above lineBuilding or Structure point, other than above pointBuilding or Structure text text

SERVICES

Electrical cable runs lineElectrical sockets pointElectric light switches pointElectric light point pointElectric light line lineTelephone cable runs lineTelephone points pointComputer cable runs lineComputer points pointGas pipe runs lineGas points pointWater pipes runs lineTap points pointBasins, sinks, baths and toilets lineHeating pipe runs lineRadiators lineFire Hydrant pipe runs lineFire Hydrant points pointServices line, other than above lineServices point, other than above pointServices text text

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Appendix S (Contd)



Column 1 2 3 4 5 6 7 8


FURNITURE

Desks and Tables lineFiling Cabinets lineShelves lineFurniture line, other than above lineFurniture point, other than above pointFurniture text text

FEATURE CODES FOR UNDERGROUND SERVICES SURVEY

UNDERGROUND SERVICES

Electricity main or service lineGas pipe lineWater main pipe lineSewerage/drainage pipe lineTelecommunications cable/duct lineSurface apparatus - general pointManhole/inspection cover pointArea of special sensitivity lineLimits of underground chamber lineThrust block pointPUSWA road description lineImprovement line lineObserved plant position pointSupports point

NOTE: This feature coding scheme conforms with the standard system published by the NationalJoint Utilities Group.

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Appendix S (Contd)



ATTRIBUTE MNEMONICS

The following attribute mnemonics are to be used if attribute data are required.GA GaugeHT HeightWI WidthDI DiameterTY TypeTX TextCL ClearanceDP DepthGH GirthSP SpreadCL Cover levelIL Invert levelNS Non surface (specify separation)RN Reference numberFC Feature code

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Appendix S (Contd)



SYMBOL DEFINITIONS FOR OUTPUT

This Appendix defines the symbols referenced in the feature code table in Appendix S. These symbols shall beused for output from digital data, if drawings are specified in Clause 12.

SYMBOL DEFINITION

1.Triangulation Station RN AttributeOriginsize

Comment:- Base parallel to grid.Ref.No. positioned preferred parallel to grid/line of survey.

2.Bench Mark -------Origin

RN Attribute

Comment:- Ref.No. positioned to right preferred parallel to grid/line of survey

3. Pylon

-------Origin

WI

Comment:- Positioned to correct orientation and scale unless below ...metres WIThen symbolised to WI ..... at correct orientation.

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Appendix T



Data Model and Record Definition - a brief introductionIf the data model is not defined by the modelling / CAD system in use by the Client, it will be necessary todefine one, and define the various records in use by the model.There are four generic data models for geodetic data.

Raster - All data is defined in two dimensions only by a succession of pixels. No features, attributes, orrelationships are identified, nor can they be.

Coded Strings - The data defines the geometry by a succession of coordinate pairs or triplets. Point and linerelationships as simple as a solid line, or as complex as attributes allow can be defined. This is the mostcommonplace data model and is the basis of most modelling / CAD systems.

Link and Node - A series of segments (links) connected only at terminals (nodes). Link and node data haverelationships (topology) which are no longer dependent just on position, but can be represented in a logical datamodel such that the data can be mathematically manipulated. The classic illustration is the road network model.The nodes are junction points, the links represent possible routes, which may not be in their geometric position.

Structured Data (Object Related) - The term structured is often used, but this is misleading as all data - evenraster - have some structure albeit very simple.

The term object related is more precise, as in the real world entities (or objects, such as a house) are defined interms of geographical position, and have attributes assigned to them.Once the choice of model type is made, the Client must then decide on the relationships needed for the project.An example of a basic data relationship is given below.

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Appendix T



Database Attribute(notional) FEATURE

Section Line Point Name

Line Geometry Point Geometry

After defining the data model the record definition is made. A fictitious example definition, which must be madefor every record type is given below.

2-D GEOMETRIC RECORD

PurposeOnce a 2-D line or point has been identified then its position has to be defined.

LayoutAssuming a line consisting of two sections joining three points

REC-SERIAL NO = 17GEOMETRY TYPE = L (for line)NO-COORDS = 3 (number of coords for

this line)X-COORD = xxxxx.xxx(format as appropriate)Y-COORD = yyyyy.yyySEPARATOR = ;X-COORD = xxxxx.xxxY-COORD = yyyyy.yyySEPARATOR = ;..etcEND-OF-RECORD =<lf> (line feed for end of record)

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Appendix T



Other Considerations

There are other items which may be relevant to the data model and record definitions, as described below.

Description of line features - typically described by a series of coordinates to be joined by straight lines onoutput.

Curves may be a series of coordinates sufficient to define the shape by straight lines at nominal scale, or discretepoints sufficient to define the shape at nominal scale with a suitable algorithm. The algorithm should bespecified.

Text may be defined by a coordinate pair / triplet, to define position, with orientation and height attributes.Default orientation is typically East - West to the nominal grid.

Position will typically be lower left corner of start of text.

Orientation will usually be radial from North in degrees / grads.

Text height will need defining, either in metres or millimetresat nominal scale.

The justification and position of text (for eventual display, as opposed to attribute text) may be relevant. While adefault position, with some display overlapping to detail, may be satifactory for minor descriptions, it may not beso for road names etc.

Alternatively, text can be digitised as line features at nominal scale and orientation.

The data model may also include some attributes of data quality, precision, etc.

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Appendix T



DATA INTEGRITY VALIDATION

Validation of data on input to the modelling / CAD system, is particularly important when data volumes orcomplexity are such that visual inspection of the data on a workstation is inadequate.

There are three elements to data integrity - physical, logical and data validity.

Physical validation concerns the recorded data file. Obvious check of file size and date, may only be valid if thewhole system - Survey Contractors, Design Organisations and Clients - use the same computer operating systemand same commands to read and write data.

A more rigorous check is some form of sum checking. In this case a program reads the entire file, summing theindividual bytes as it proceeds. A repeat of the check using the same algorithm on the receiving system shouldresult in an identical answer.

Precautions are necessary. The most obvious source of potential ‘error’ is where one system saves to exact filelengths, and another with fixed length blocks. The data are identical but one file is longer.

Logical validation concerns the record structure of the file. Software to check this can be very complex. Theobjective is to check for valid record construction, order and size: ie the file should begin with a valid headerrecord which should contain certain fields; feature records should be followed by geometry records; etc.

Data validity concerns the range of individual values: ie if a geometry record has specified 15 coordinatetriplets, are there 15; are they of the correct magnitude; is there a proper record terminator?

This software is often combined with logical validation programs.

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Appendix U