Definition: Raster

UN - Geographic Information Systems

A geographic data model that represents information as a regular array of rows and columns, similar to a grid or image. Raster cells are usually, but not always, square. Area or line features are represented as groups of adjacent raster cells with the same value.
Source:
United Nations, "Handbook on Geospatial Infrastructure in Support of Census Activities", Department of Economic and Social Affairs, Statistics Division, Studies in Methods, Series F No. 103, New York, 2009
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