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.
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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