Contour lines are lines connecting points of equal elevation. They are useful because they allow to better understand the shape of the land surface (the topography) on a map.
The Elevation Interval of a contour map is the difference in elevation between successive contour lines. Typical values of the Elevation Interval are 100, 50, 25, or 10 meters for areas with large elevation variations (e.g. mountains) and 5, 2, 1, or 0.5 meters for areas with small elevation variations (e.g. flat land).
|DTM||Contour Lines using the DTM|
|DSM||Contour Lines using the DSM|