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A GIS tool for merging attribute tables using spatial relationships
A spatial join is an operation in a geographic information system (GIS) or spatial database that combines the attribute tables of two spatial layers based on a desired spatial relation between their geometries.[1] It is similar to the table join operation in relational databases in merging two tables, but each pair of rows is correlated based on some form of matching location rather than a common key value.[2] It is also similar to vector overlay operations common in GIS software such as Intersect and Union in merging two spatial datasets, but the output does not contain a composite geometry, only merged attributes.
Spatial joins are used in a variety of spatial analysis and management applications, including allocating individuals to districts and statistical aggregation. Spatial join is found in most, if not all, GIS and spatial database software, although this term is not always used, and sometimes it must be derived indirectly by the combination of several tools.
^Longley, Paul A.; Goodchild, Michael F.; Maguire, David J.; Rhind, David W. (2011). Geographic Information Systems & Science (3rd ed.). Wiley. p. 360.
^Campbell, Jonathan; Shin, Michael (2011). Essentials of Geographic Information Systems. Saylor Foundation. p. 182. ISBN 9781453321966. Retrieved 5 January 2023.
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