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Minimum Mapping Unit (MMU)

The minimum mapping unit (MMU) is the smallest size that determines whether a feature is captured from a remotely sensed image, such as an aerial photograph or a satellite image. Determination of the MMU defines the amount of detail captured in the process of image interpretation.

The concept of an MMU can apply either to visual image interpretation, such as photogrammetric compilation from an aerial photograph, or to digital image processing, such as satellite image classification. For visual image interpretation, MMU refers to the size above which an areal feature is represented as a polygon, the size or dimension below which a long, nar-row polygonal feature is represented as a line, and the size below which a small area is represented as a point. In addition, ...

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