PostGIS is an extension for the PostgreSQL object-relational database that adds support for geographic objects.
PostGIS is an extension for the PostgreSQL object-relational database that enables the storage of geographic objects. PostGIS is designed according to the OpenGIS Simple Feature Access for SQL specification published by the Open Geospatial Consortium.
The current stable version is PostGIS 2.2.0 (released October 7th, 2015) which adds in volumetric geometry support, more advanced spatial clustering functions, in-database raster processing, and new high-speed native code address standardizer.
PostGIS has been developed by Refractions Research and others and is released under the GNU General Public License.