Contour Lines using the DTM

 
Video: Watch the instructional video related to Contour Lines and DTMhere.

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). 

 
Information: The contour lines generated using the DTM (Digital Terrain Model) are useful when the area is covered by objects, like buildings. The objects are filtered out for the DTM generation and they do not affect the contour lines based on the DTM.

 

   
DTM                  Contour Lines using the DTM 

 

   
DSM                  Contour Lines using the DSM 
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