2.5. Construction of a digital terrain model
2.5.1. The concept of the DEM and structure of the model
The DTM was originally used to design highways. The DTM is defined as an array of orderly values that are used to describe the spatial distribution of various properties of the Earth's surface (for example, mainly geomorphic information, object information, natural resource and environment information, and economical information). When the DTM is used only to describe and express spatial information, such as terrain relief and elevations, it is also called a DEM.
The DEM has many expression forms, the most common two of which are the regular grid DEM and the triangulated irregular network (TIN) DEM.
2.5.1.1. The regular grid DEM
The regular ...
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