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Environmental Applications of Digital Terrain Modeling

Environmental Applications of Digital Terrain Modeling

Hardcover

Series: Analytical Methods in Earth and Environmental Science

Geology

ISBN10: 1118936213
ISBN13: 9781118936214
Publisher: Wiley-Blackwell
Published: Apr 30 2018
Pages: 368
Weight: 2.10
Height: 0.90 Width: 7.10 Depth: 10.10
Language: English

A digital elevation model (DEM) is a digital representation of ground surface topography or terrain. It is also widely known as a digital terrain model (DTM). A DEM can be represented as a raster (a grid of squares) or as a vector based triangular irregular network (TIN). DEMs are commonly built using remote sensing techniques, but they may also be built from land surveying. DEMs are used often in geographic information systems, and are the most common basis for digitally-produced relief maps. The terrain surface can be described as compromising of two different elements; random and systematic. The random (stochastic) elements are the continuous surfaces with continuously varying relief. It would take an endless number of points to describe exactly the random terrain shapes, but these can be described in practice with a network of point. It is usual to use a network that creates sloping triangles or regular quadrants.

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Geology