I learn that spatial data is often referred to as layers, coverages, or themes. Themes represent, in a special digital storage format, features on, above, or below the surface of the earth. Depending on the type of features they represent, and the purpose to which the data will be applied, themes will be one of 2 major types.
Vector data represent features as discrete points, lines, and polygons.
Raster data represent the landscape as a rectangular matrix of square cells.
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