The next derivative of the DTM is contours, with the interval 0,5 FT, 1 meters or 2,5 FT.
Aside from the DTM map contours can also be obtained from the measurement of terrestrial.
DTM is a further derivative of contours, with intervals of 0.5 meters, 1 meters or 2.5 meters.Aside from the DTM contour maps can also be obtained fromterrestrial measurements.