Synthesis

Publisher Summary This chapter defines the key criteria in the algorithm's sensitivity to DEM high-frequency noise and the possibility of its suppression. This is because any DEM contains errors, but filtering techniques are unable to remove all the errors from DEMs. All calculation methods of geomorphometry more or less increase the manifestation of high-frequency noise in models of topographic variables that may limit the possibility to use and interpret such models. One other important factor influences the selection of a particular calculation algorithm. This is the type of DEM grid. It is important to realize that widespread calculation methods to process DEMs on a plane square grid cannot be applied to handle DEMs on a spheroidal equal angular grid. This is associated with principal differences in the geometry of these grid types.