GIS Dictionary
Definitions for GIS terms related to operations such as analysis, GIS modeling and web-based GIS, cartography, and Esri software.
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filter
See Also:
focal analysis
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[spatial analysis]
On a raster, an analysis boundary or processing window within which cell values affect calculations and outside which they do not. Filters are used mainly in cell-based analysis where the value of a center cell is changed to the mean, the sum, or some other function of all cell values inside the filter. A filter moves systematically across a raster until each cell has been processed. Filters can be of various shapes and sizes, but are most commonly three-cell by three-cell squares. 
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[data analysis]
A desktop GIS operation used to hide (but not delete) features in a map document or attribute table. -
[data analysis]
A constraint used to define a subset of data.
