Visual Survey (Laser Scan) Overview

Applying Fundamental Measurement

Work Process to Dimensional Control

Technologies

Agenda

• Explanation of Dimensional Control and the Visual Survey Technology� Establishing the Fundamentals

� Understanding Benefits & Limitations

� Recognizing Value & Acceptance

• Implementing an Execution Strategy� Planning

� Determining Costs

• Roles and Responsibilities � Guidelines for the Project Engineer Using the Visual

Survey on the Project

� Key Factors To Remember

Establishing the Fundamentals

• Review Terminology

• Laser Scan Technology (Types)

• Understanding Dimensional Control and its Relationship to the Laser Scan Technology.

• Why Use Visual Survey Technology?

• What Should Determine the Use of the Visual Survey Technology?

• How Can Value Be Determined By Using the Visual Survey?

Terminology - Dimensional Control

“Dimensional control is a risk mitigation process that

is applied to every project execution task that requires

a dimensional accuracy.”

Dimensional Control Illustration

“Measure twice; cut once”

Terminology - Visual Survey

“ It is the deliverable that is created from

the culmination of measurement and visual

technologies”

“It is the Future

Direction of Survey”

Other Terminology

• Reference Control – The Point of Reference Where All Measurements for Engineering and Construction Will Be Tied To

• Scan Registration - Process in which Laser Scans are Tied to the Survey Control

• Point Cloud - Laser Scan Data from Multiple Scan Stations in a Defined Volume Space

• Segmentation – The Process of Separating and Isolating Groups of Points from the Laser Scan

• LASERGen – Software Developed by BitWyse Solutions to Work with the Laser Scan Data. (Used in the Past)

• LFM Viewer & LFM Server – Software Developed by Z+F to Work with the Laser Scan Data. (Currently Using)

Laser Scanning Technology

Laser Scan Technologies

• LIDAR (Light Detection & Ranging)

• Phase Based (AMCW - Amplitude Modulated Continuous Wave)

• Triangulation

Types of Laser Scanning

• Aerial

• Terrestrial

Dimensional Control and Laser Scanning

“The Laser Scanning Technology is a Dimensional

Control Tool”

What is the Relationship?

Laser Scan Technology Benefits

• More Accurate Measurement Information in Less Time than Traditional Methods

• Visual Representation of Measurement Data

• Integrates With Design Engineering CAD Applications

• Consolidates Multiple Measurement Tasks

Laser Scan Technology Limitations

• Extreme Temperatures

– Electronic Parts that Freeze Up or Overheat

• Highly Reflective Materials

– Mirrors, Water, Polished Chrome

• Steam, Rain, and Fog

• Strong Vibrations

Why Use Visual Survey Technologies Over Traditional Methods of Measuring?

What Factors Determine the Consideration of Using a Visual Survey Technology?

• Costs – Cost Risk in Having Accurate Dimensional Information During

Engineering and Construction

• Schedule– Risk to Schedules Impacted by Dimensional Errors that Occur

in Engineering and Construction

• Quality– Quality Risks in Engineering from and Constructing to

Existing Conditions

• Safety– Exposure Risks Going into Hazardous Environments to

Capture Existing Condition Information, and Re-Work in the Field Resulting from Dimensional Errors

“Execute Better, Faster, Cheaper and Safer”

Value of Laser Scan Technology

• Safety

– Reduced field exposure

– Reduced travel

• Quality

– Accurate as-built data/conditions

– 3D model in PDS for interference detection

– Accurate construction documents

• Cost effectiveness

– Reduced schedule cycle time for data gathering (80%)

– Promotes work sharing to low cost center

– Reduce field re-work to less than 1%

Savings ($100 MM Project)• Reduced field data gathering $0.4 MM• Work share opportunities $0.9 MM• Reduced rework $1.0 MM

$2.3 MM

Shortened Project Duration – 10%

Laser Scan Technology Acceptance

Sales of terrestrial 3D laser scanners topped $44.8 million in 2004, according to our latest estimate – a growth of 65% over the year before.

“Plan the Work, and

Work the Plan

Planning an Execution Strategy

Factors That Determine Using the Visual Survey or Another Dimensional Control Method

• Scope– Determine the Amount of

Information to be Captured

• Costs– Determine the Estimated Costs

for Visual Survey and Traditional Measurement Tasks

• Schedule– Determine When to Execute To

Maximize the Value

• Safety– Determine the Safety Risks

• Risks– Determine Cost Risks

• Logistics– Determine Logistical Issues

that May Impact Dimensional Control Tasks

Planning - When To Execute The Visual Survey

• After All Disciplines Have Defined and Submitted Their As-Built Dimensional Requirements

• After the Field Execution Plan Has Been Developed

• After the Selected Jacobs Pre-Qualified Service Provider Has Fulfilled the Client’s Requirements to Execute Work In Their Facility

• After an Understanding of the Project Scope, Field Execution Schedule, and Deliverable Requirements and Schedule Between Jacobs and the Service Provider

• After the Jacobs Field Representative Who Understands the Project Requirements, and is Knowledgeable of the Visual Survey Process has Been Identified To Go To the Client Facility To Direct the Visual Survey Service Provider

Planning – How To Execute The Visual Survey

• Establish the Reference Control

• The Jacobs Field Representative Will Locate Scan Station Setups and Review Scans For Quality Assurance

• Ensure Site Obstructions That May Interfere with the Visual Survey Are Removed

• Ensure Activities Are Coordinated With Unit Operators to Minimize Traffic Where The Visual Survey Is Being Executed

• Ensure Climate and Site Conditions Meet Acceptable Conditions for the Laser Scanner To Operate At Acceptable Performance

Determining Costs

Planning an Execution Strategy

How to Estimate the Cost of the Visual Survey

• Determine the Number of Scans Based on Project Discipline Requirements

• Determine Number of Days to Execute Based on Number of Scans and Complexity

• Determine Expenses Based on Number of Days and Travel Location

• Determine if the Visual Survey Will be Executed on One or More Trips

• Factor in Costs for Specialty Items (i.e. Special Training Needs, Special Equipment)

Visual Survey Proposal

• Summary of Scope

• Estimated Number of Scans to Collect

• Estimated Number of Days to Collect the Information

• Estimated Number of Days to Process the Scan Information and Generate Deliverables

• Cost Breakout for Services and Expenses

• Unit Rates

Required Items That Are To Be Included In

the Service Provider Proposal:

Visual Survey Deliverables

• Registered Scan Data Delivered on Hard Drive That is Compatible with Jacobs Software

• Electronic Plot Plan Identifying Scan Station Location

• Digital Imagery

• Detailed Survey Report

• Excel Spreadsheet of All Surveyed Targets Used to Register Scan Data

Required Deliverables From the Service

Provider:

Cost Estimate Example to Execute a Visual Survey

• Site 600’L x 320’W x 100’H

• 400 - Tie-ins

• 270 - Laser Scan Setups

• I – Trips to the Facility

• 8 – Days in the Field

• 3 Service Provider Personnel

• 1 Jacobs Personnel

• Invoiced Amount $85,000 For Visual Survey Services (Services and Expenses)

• Estimated $10,000 For Jacobs Personnel (Hours and Expenses)

Cost Estimate Example to Execute the Same Project with Traditional Methods

• Site 600’L x 320’W x 100’H

• 400 - Tie-ins

• 2 - Trips to the Field

• 10 – Days in the Field

• 10 - Jacobs Personnel

• Estimated $110,000 for Jacobs Personnel (Hours and Expenses)

• Estimated $25,000 for Additional Survey Services

Project Engineering's Role

Guidelines for the Project Engineer Using the Visual Survey on the Project

• Ensure the Reference Control for the Project Has Been Established for the Project

• Works With the Project Team to Determine if the Visual Survey is a Cost Effective Solution For the Project

• Develop the Cost Estimate for Implementing the Visual Survey on the Project

• Ensure the Visual Survey is Added as a Scheduled

• Collect All Project Discipline Requirements to Create the Visual Survey Cost Estimate

Guidelines for the Project Engineer Using the Visual Survey on the Project

• Work with Sub-Contracts to Issue a Request for Proposal from the Service Providers

• Coordinate and Plan the Execution of the Visual Survey at the Site with the Client To Ensure No Un-expected Conflicts Will Occur

• Act As the Point of Contact if Questions Pertaining to the Project Arise Addressing Visual Survey Scope

• Make Sure All Project Disciplines are Utilizing the Visual Survey on the Project

Key Factors to Keep in Mind

• Never Assume When it Comes to Dimensional Control and Survey.

• The More Effort in the Planning Will Return the Most Value in the Deliverable.

• Challenge Yourself and Others to Use this Technology to Your Advantage.

• The Work Process Should Always Drive the Technology, and NOT the Technology Driving the Work Process.

• There is Only One Thing That Is for Certain, Change is Inevitable.

• The Dimensional Control Process Will Be Used on a Project, But the Methods of How It Will Be Executed Will Be Determined By Project

Questions?