Definition: Minimum mapping unit
UN - Geographic Information Systems
Generally the size of the smallest feature that will be included on a map. Also, at a given map scale, this is the size or the dimension at which a small, compact polygon feature is represented as a point or a long narrow polygon feature is shown as a line. For example, a town is shown as a polygon if its size is larger than 3 mm on a page, but as a point if it is smaller.
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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