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D

Dielectric constant

Electrical property of matter given as a factor by which the electric field between charges is decreased or increased relative to vacuum.

Digital Elevation Model (DEM)

A Digital Elevation Model (DEM) is a bare earth elevation model representing the surface of the Earth without features like houses, bridges, and trees.

Digital Surface Model (DSM)

A digital surface model is an elevation model that includes the top of buildings, tree canopy, powerlines and other features above the bare earth.

Digital Terrain Model (DTM)

DTM is a bare earth representation of the Earth’s surface that is augmented by natural features such as ridges and breaklines.