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PostGIS adds support for geographic objects to the PostgreSQL object-relational database. In effect, 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 SQL" and has been certified as compliant with the "Types and Functions" profile.
The postgis-utils package provides the utilities for PostGIS.
The postgis-client package contains the client tools and their libraries of PostGIS.
The gui package provides shp2pgsql-gui for PostGIS.
Just-in-time compilation support for PostGIS.
The postgis-upgrade package contains the previous version of Postgis as well as the current version of Postgis built against the previous version of PostgreSQL necessary for correct dump of schema from previous version of PostgreSQL.