PostGIS

From PostGIS website: PostGIS is a spatial database extender for PostgreSQL object-relational database. It adds support for geographic objects allowing location queries to be run in SQL.
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A list devoted to the discussion of the use and uses of the PostGIS/PostgreSQL spatial database system. 5777 19141
by Alain Benard
This list is devoted to discussion of ongoing development to the PostGIS spatial database. Technical issues and debates about changes to the internals of PostGIS belong here. 1952 7241
by Martin Davis-3