Question

A building is an obstacle to :

• A. Ranging but not chaining
• B. Chaining but not ranging
• C. Neither chaining nor ranging
• D. Both chaining and ranging

Answer 1

The correct option is D Both chaining and ranging

Obstacles in chaining are obstruction to measurement such as rivers, lakes, building, etc.

Obstacles in ranging are the obstruction to view such as hill, building. These obstruct ranging as both end stations of the survey line are not intervisible.

Note: Rivers, lakes etc are not obstruction to ranging as they do not obstruct view.

Chaining

• It is the measurement of horizontal distance either by chain or tape.
• It is suitable for small areas with fairly levelled ground.

Ranging

• It is the process of establishing intermediate points on a survey line joining two stations.