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The term georeference, used as both a noun and a verb, has many and varied definitions in geographic information science. Most simply, to georeference is to specify the geographic location of some object, entity, phenomenon, image, concept, data, or information. A georeference, therefore, is the description of the location of something relative to the earth. All data used within GIS must be georeferenced. The term geocode is sometimes used synonymously with georeference, either as a noun or verb, though it is more often used with a more specific meaning relating to the transformation of street addresses to point locations on a map or in a GIS layer. More specifically, this transformation is referred to as address matching. This entry provides a basic framework of definitions ...

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