Surveying and Levelling : PLOTTING THE OUTLINE OF THE GIVEN BUILDING-CROSS STAFF SURVEY : Practical 4

 PLOTTING THE OUTLINE OF THE GIVEN BUILDING-CROSS STAFF SURVEY

 

Aim:-

To plot the plan of an existing building by running a closed chain traverse and to find the 

area of the plot. 

 

Instruments Required:-

Chain, Cross staff, optical square, ranging rods, arrow & tape. 

Procedure:- 

1. Range and chain the lines around the given building to form a rectangle in clockwise/anti

clockwise direction. 

2. Measure all the offset points (Perpendicular/ Oblique) from the chain line.

3. Plot the building in a drawing sheet with suitable scale.

4. Subtract the un-built up area (open space) of the plot from the total area of the plot to find 

the built up area of the building. 

Result:- 

The plan of the building is plotted as shown in figure. 

Area of the plot   (a) =……………………

Area of the open space (b) = ……………………

Area of the building =     (a)-(b) = ……………………