GIS Dictionary

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  1. [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.
  2. [analysis/geoprocessing] In geoprocessing, the geometric intersection of multiple datasets to combine, erase, modify, or update features in a new output dataset. Media/overlay.gif

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