In the sense of digital terrain modeling, there is a set of techniques for obtaining a Digital Elevation Model (DEM). But, as expected, modeling the terrestrial surface, its representation in a virtual space, involves certain problems that are related to the surface specificity itself and our way of measuring it. Numerical altitude models, once performed, find their usefulness as input data for derivation of some topographical attributes of geomorphometric parameters, morphometric variables or general information about the land respectively.