The digital land model (DTM) is a numerical representation of the land surface z=f(x,y) and obviously an approximate representation, because the land has a discontinuous shape and is approximated by a continuous function. Are ASCII text files (x,y,z) with points density between 2 m — 30 m.
DTM is obtained by exploiting a virtual stereoscopic model,
made in the process of exploiting a stereogram.
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