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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overlay
See Also:
spatial overlay
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[analysis/geoprocessing]
A spatial operation in which two or more maps or layers registered to a common coordinate system are superimposed, either digitally or on a transparent material, for the purpose of showing the relationships between features that occupy the same geographic space. -
[analysis/geoprocessing]
In geoprocessing, the geometric intersection of multiple datasets to combine, erase, modify, or update features in a new output dataset. 
