Definition: Map extent
UN - Geographic Information Systems
The coordinates in map units that define the rectangle that encloses all features contained in a specific map display or a GIS database; i.e., the minimum and maximum x and y coordinates in a digital database or the part of a database shown in a map display
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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