Ex.36-1 Explain the following:

• Errors in plane tabling.
• Permissible centering error in setting of Plan Table for 1/2000 scale mapping.

Ex.36-2 While setting up a plane table at station P, it was found that the point 'p' representing the station P on sheet was not proper. The displacement of P was 30 cm in a direction right angles to ray PA drawn to a ground point A. Calculate the corresponding displacement of 'a' from its true position, for the following cases:

(i) Scale of the map 1:50,000 distance PA = 2000 m

(ii) Scale of the map 1:2000 distance PA = 50 m

(iii) Scale of the map 1 cm = 1 m, distance PA = 15 m.

<Answers>

<< Back