Question

Distinguish between the following:

Contours and Form Lines.

Answer 1

Sr. No.	Basis	Contours	Form Lines
1.	Definition	Lines joining points of equal elevation.	Estimated lines showing shape, not exact height.
2.	Accuracy	Accurate; based on survey data.	Approximate; not based on measurements.
3.	Labelled	Always labelled with height.	Usually unlabelled.
4.	Use	Detailed topographic maps.	Preliminary or sketch maps.