nsalottery.blogg.se - Dsm digital terrain model

Format - we can distinguish three main structures: GRID (point / cell), TIN (irregular topological triangle network) and contour lines (vector).Wikimedia Commons, the free media repository, (accessed October 7, 2020). Digital surface model (DSM) - numerical representation of the terrain, including objects on its surface, such as buildings and trees.This model is devoid of any objects above the ground, such as buildings or trees.

Digital terrain model (DTM) - numerical representation of the terrain with its morphological forms.

DEM is the general name for a group of models with different characteristics, including: In addition, they are a source for derived products such as terrain slope and aspect. DEMs are one of the key datasets in Geographic Information Systems (GIS) and constitute the basis for many environmental spatial analyses. They are created as a result of the processing of aerial photos, laser scanning (LiDAR), geodetic surveying, or radar interferometry (InSAR).

Digital elevation models are models describing the terrain surface.