DEM (Digital Elevation Model).
DEM files contain the elevation of the terrain over a specified area, usually at a fixed grid interval over the “Bare Earth”.
Contour map shows the elevation and slope of the ground surface by means of contour lines. Contour maps are the best way to visualize the slope of the terrain whether the terrain is flat or undulating. Contour map helps to finding out the depth of cutting and filling. It helps to identify the suitable site for any project
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