spatial frequency
spatial frequency In remote sensing, the frequency of change per unit distance across an image. High spatial frequencies include those changes which occur in very close proximity, such as fine lines, low spatial frequencies include those changes which occur over greater distances, such as broad bands. The ability of the human eye to discern spatial frequency is limited and so selective removal of certain spatialfrequency ranges within an image may result in a more interpretable image with less noise. See also SPATIAL-FREQUENCY FILTER.
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spatial frequency