Islamic university-GazaFaculty of engineeringCivil engineering departmentSurveying (1)

Report )4)

Mapping a building by using linear measurement tools

Group names :

120091883م: اسامة محمد عبد الهادي

120092395م: يوسف عمر نصر

120093007م: حازم غازي الفرا

120092732م: صالح خضر االنقح

120091718م:احمد سعد الدين االغا

To Eng:

Ahmed F. Elhalaq

Day :Tuseday Date: 9/11/2010

Fig(2):Ranging Rod

Fig(1):The tape Fig(2):Arrows Arrows

Mapping a building by using linear measurement tools

Introduction:

Mapping buildings is very important, because it's used to make maps for the city that helps to deal with population urban planning for that city

Tools:

1-Tape: see figure(1)

2-Ranging Rod: see figure(2)

3-Arrows: see figure(3)

4-Compass: see figure(4)

Fig(4):compass

Methodology:

1-Determine the building and exploration the area before performing any field measurements we shape of the area, as well as, existing details and draws a reasonable sketch of the area .

2-Determine all chain lines around the building which we need they according the conditions below ,then draw they in the sketch.

3-Measure the angle between north direction and one of the chain lines.

4-Determine all corners of the building .

5-Measure the length of chain lines then record them.

6-We used the offset methods to mapping the building , where we measure the vertical distance from corners of the building to the chain lines by using the shortest distance then record its measurments.

7-To know drawing chain lines in the map we need to measure length of triangle sides which its two sides are part of two chain lines first of them we measure the angle between it and the north direction , then record them( see figure 5 ).

8- Finally we can draw the building in the map .

Conditions Of Chain line:

1-The chain line should be as close as possible.

2-Number of chain lines should be minimum.

3-Achain line should not pass through any obstacles.

4-From any chain point two points at least can be seen.

5-Chain points should be at firm ground.

6-Angles between chain lines are be between(30-120).

7-The shortest length of any chain line should be≥ 1/3 of the length of the longest one.

This figure show the triangles which we take it to know drawing chain lines in the map:

3m 3m 3.83m 3.78m 2m

5m 4.34m 3.6m 3m

2m 2m Figure(5)

Comment:

Tha experiment was easy and simple as telling how to mapping abuilding (practically) after it vague (theorical) but we have some difficulties in draw the map(manually )because it is the first time we do it.

Appendix:

Day: Tuesday

Date: 9/11/2010

Scale:

1:300

North direction:

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Title:Mapping abuilding by using lnear measurement tools