Raster

raster - Source: PreANVIL index http://www.anvil.eu.com/find/Glossary-english.htm

The representation of spatial data as a matrix of valued cells. Originally, a raster was a scan line in an electronic display such as a television or computer monitor. In geoprocessing, raster refers to a digital representation of the extent of geographic data sets using "grid cells" in a matrix. A raster display builds an image from pixels, small square picture elements of coarse or fine resolution. A raster database maintains a "picture" of reality in which each cell records some sort of information averaged over the cell`s area. The size of the grid cell may range from centimeters to kilometers. Many satellites transmit raster images of the earth`s surface. Reflectance of sunlight at a certain wavelength is measured for each cell in an image.

[Category=Geospatial ]

Source: Open Geospatial Consortium, 02 July 2011 09:39:44, http://www.opengeospatial.org/ogc/glossary

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raster - [data models] A spatial data model that defines space as an array of equally sized cells arranged in rows and columns, and composed of single or multiple bands. Each cell contains an attribute value and location coordinates. Unlike a vector structure, which stores coordinates explicitly, raster coordinates are contained in the ordering of the matrix. Groups of cells that share the same value represent the same type of geographic feature.

[Category=Geospatial ]

Source: esri, 25 July 2012 10:21:29, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation