SCHOOL OF ARCHITECTURAL,

BUILDING &

DESIGN

BACHELOR OF QUANTITY SURVEYING (HONOURS)

AUGUST 2014

[QSB 60203] SITE SURVEYING

Fieldwork 1

Group Member: Eley Chong Shu Hui 0319458

Melvin Lim 0315772

Moy Chin Hoong 0314014

Muhammad Hakim 0310371

Lecturer : CHAI VOON CHIET

Contents

Contents Pages

Objective 1

Introduction to auto level 2

Field Data 3

Adjusted Data 4

Summary 5

Objectives

To allow us to have a better understanding or knowledge about the process of using the

instrument (Auto-level) rather than learning from a video in class.

To enable us to have the experience in using auto-level such as setting up, collaborating,

leveling and recording data.

To allow us to learn more about the life being a quantity surveyor.

To allow us to experience and expose to the actual working environment in site such as working

under the hot weather.

To allow us to have the teamwork while carrying out the fieldwork.

To enable us to learn how to analyze the data collected.

To allow us to understand how to distribute different types of error from the data collected on

field.

To enable us to have a basic knowledge on how to set up the points for leveling.

To allow us to have the ability to undertake the site measurements and calculations.

To enable us to know the precautions to be taken while using Auto-level.

Introduction to auto level

Automatic levels have been with us since the middle of the twentieth century. Today, they are so

common place that the adjective “automatic” is frequently not even used. But this advance in

technology has been the single most significant feature in the history of vertical distance measurement.

The basic principle of optical leveling is to create a line of sight through the telescope that is normal to

the direction of gravity at that point. Before automatic levels, this was done by ensuring that the vertical

axis of the level was truly vertical. Other adjustments ensured that the line of sight was perpendicular to

this vertical axis. The basic advance of the automatic level is that the level of perfection in verticality of

the axis is no longer critical.

Even the well-made pre-automatic instruments, ensuring that the axis was vertical had practical

limitations, thus requiring the surveyor to relevel the instrument with every sighting. The practical

problem resolved for the surveyor is that this releveling is no longer necessary. The technology in the

instrument “automatically” does it.

Auto Level Auto level with rod

Field Data

Field Data by Using Rise and Fall Method

Bench Mark (BM)

Back Sight (BS)

Fore Sight (FS)

Rise Fall Reduced

Level

1.165 100.000

1 1.655 3.510 2.345 97.655

2 1.725 1.590 0.065 97.720

3 1.283 1.630 0.095 97.815

4 1.643 1.530 0.247 97.568

5 1.403 1.428 0.215 97.783

6 1.395 1.405 0.002 97.781

7 1.465 1.580 0.185 97.596

8 1.403 1.425 0.040 97.636

9 3.495 1.285 0.118 97.754

10 1.513 1.305 2.190 99.944

11 1.490 0.023 99.967

18.178

-18.145

18. 178 2.779

-2.746

2.779 100.000

- 99.967

0.033 0.033 0.033

Field Data by Using Height of Collimation Method

Bench Mark

(BM)

Back Sight

(BS)

Fore Sight

(FS)

Height of

Collimation

Reduced

Level

1.165 101.165 100.000

1 1.655 3.510 99.310 97.655

2 1.725 1.590 99.445 97.720

3 1.283 1.630 99.098 97.815

4 1.643 1.530 99.211 97.568

5 1.403 1.428 99.186 97.783

6 1.395 1.405 99.176 97.781

7 1.465 1.580 99.061 97.596

8 1.403 1.425 99.039 97.636

9 3.495 1.285 101.249 97.754

10 1.513 1.305 101.457 99.944

11 1.490 99.967

18.178 -18.145

18.178

100.000 - 99.967

0.033 0.033

Adjusted Data

Allowable error is 12√(11) = 39 mm (permissible error)

Adjusted Data by Using Rise and Fall Method

Bench Mark (BM)

Back Sight (BS)

Fore Sight (FS)

Rise Fall Reduced

Level Correction

Adjusted Reduced

Level

1.165 100.000 0.000 100.000

1 1.655 3.510 2.345 97.655 +0.003 97.658

2 1.725 1.590 0.065 97.720 +0.006 97.726

3 1.283 1.630 0.095 97.815 +0.009 97.824

4 1.643 1.530 0.247 97.568 +0.012 97.580

5 1.403 1.428 0.215 97.783 +0.015 97.798

6 1.395 1.405 0.002 97.781 +0.018 97.799

7 1.465 1.580 0.185 97.596 +0.021 97.617

8 1.403 1.425 0.040 97.636 +0.024 97.660

9 3.495 1.285 0.118 97.754 +0.027 97.781

10 1.513 1.305 2.190 99.944 +0.030 99.974

11 1.490 0.023 99.967 +0.033 100.000

18.178

-18.145

18.178 2.779

-2.746

2.779 100.000

- 99.967

100.000

-100.000

0.033 0.033 0.033 0.000

Adjusted Data by Using Height of Collimation Method

Bench Mark (BM)

Back Sight (BS)

Fore Sight (FS)

Height of Collimation

Reduced Level

Correction Adjusted Reduced

Level

1.165 101.165 100.000 0.000 100.000

1 1.655 3.510 99.310 97.655 +0.003 97.658

2 1.725 1.590 99.445 97.720 +0.006 97.726

3 1.283 1.630 99.098 97.815 +0.009 97.824

4 1.643 1.530 99.211 97.568 +0.012 97.580

5 1.403 1.428 99.186 97.783 +0.015 97.798

6 1.395 1.405 99.176 97.781 +0.018 97.799

7 1.465 1.580 99.061 97.596 +0.021 97.617

8 1.403 1.425 99.039 97.636 +0.024 97.660

9 3.495 1.285 101.249 97.754 +0.027 97.781

10 1.513 1.305 101.457 99.944 +0.030 99.974

11 1.490 99.967 +0.033 100.000

18.178 -18.145

18.178

100.000 - 99.967

100.000 -100.000

0.033 0.033 0.000

Summary

An auto level, leveling instrument, or automatic level is an optical instrument used to establish or check

points in the same horizontal plane. It is used in surveying and building to transfer, measure, or set

horizontal levels. The first thing we did was to set up the auto level. This was done by adjusting the foot

screw to bring the bubbles to the center of the circular level and plate level. We moved the base ten

times to get different readings. Everything went well but the readings were not that perfect so we had to

do some error distributions.

The given Bench Mark of Reduced Level was 100.00m and 11 point was set up. Therefore, the

allowable error is 12√(11) = 39 mm, while the error obtained from the fieldwork was just 33 mm, which

means it is acceptable.