Definition: Overlay
UN - Geographic Information Systems
The combination of two data layers that are in the same geographic reference system. Overlay can be done for cartographic display purposes, or the two layers can be physically combined to create a new GIS data set (e.g., polygon overlay, point-in-polygon, line-in-polygon).
Source:
United Nations, "Handbook on Geospatial Infrastructure in Support of Census Activities", Department of Economic and Social Affairs, Statistics Division, Studies in Methods, Series F No. 103, New York, 2009
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