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PostGIS http://postgis.refractions.net/PostGIS adds support of geographic objects to the PostgreSQL object-relational database. In fact, PostGIS “spatially enables” the PostgreSQL server, allowing it to be used as a backend spatial database for geographic information systems (GIS), much like ESRI’s SDE or Oracle’s Spatial extension. PostGIS follows the OpenGIS “Simple Features Specification for SQ
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