Table of contents
1. DEM
1. Digital elevation model
Digital elevation model (Digital Elevation Model), referred to as DEM, is to realize the digital simulation of ground terrain through limited terrain elevation data (that is, the digital expression of terrain surface shape). A solid ground model is a branch of the Digital Terrain Model (DTM), from which various other terrain feature values can be derived.
It is generally believed that DTM describes the spatial distribution of various geomorphic factors including elevation, such as slope, slope aspect, slope change rate and other factors including linear and nonlinear combinations. DEM is a zero-order simple single-item digital geomorphic model. , other landform characteristics such as slope, aspect and slope change rate can be derived on the basis of DEM. Learn about DEM in one article