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minimum mapping units For a given map scale, the size or dimension below which a long narrow feature is represented as a line and a small area as a point. For example, streams and rivers will be represented as lines if their width is less than .
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MMU- Minimum Mapping Unit. The smallest area (usually a polygon) mapped.
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A factor known as a minimum mapping unit comes into play. Minimum mapping unit asks the question of how small something is before it is not represented on the map.
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For instance, it is very hard to distinguish anything smaller than about 1/50th of an inch on a map (the theoretical "minimum mapping unit").
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Using too small a cell size will significantly increase the storage space and processing time required, without adding precision to the map. To create an effective cell size, base the cells on map scale and on the minimum mapping unit of the other ...
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 See also: Area, GIS, Information, Cover, Map
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