- PostGIS
Infobox_Software
name = PostGIS
developer =Refractions Research
latest_release_version = 1.3.3
latest_release_date =April 12 ,2008
operating_system = GNU/Linux, MS-Windows,Mac OS X ,POSIX compliant systems
genre =Geographic information system
license = GPL
website = http://postgis.refractions.netPostGIS (/post'-jis/) is an open source
geographic information system software program that adds support for geographic objects to thePostgreSQL object-relational database. PostGIS follows theSimple Features for SQL specification from theOpen Geospatial Consortium . As such, PostGIS includes:* Geometry types for points, linestrings, polygons, multipoints, multilinestrings, multipolygons and geometrycollections.
* Spatial predicates for determining the interactions of geometries using the 3x3Egenhofer matrix .
* Spatial operators for determining geospatial measurements like area, distance, length and perimeter.
* Spatial operators for determining geospatial set operations, like union, difference, symmetric difference and buffers.
*R-tree spatial indexes for high speed spatial querying.
* Index selectivity support, to provide high performancequery plan s for mixed spatial/non-spatial queries.The PostGIS implementation is based on "light-weight" geometries and indexes optimized to reduce disk and memory footprint. Using light-weight geometries helps servers increase the amount of data migrated up from physical disk storage into RAM, improving query performance substantially.
The first version was released in 2001 by Refractions Research under the
GNU General Public License , and development has continued since then actively. In 2006, PostGIS was certified as a compliant Simple Features for SQL database by theOpen Geospatial Consortium .There are a large number of software products that can use PostGIS as a database backend, including:
* ArcSDE 9.3
* Cadcorp SIS
*Feature Manipulation Engine
*GeoServer
*GRASS GIS (GPL)
* Interoperability Extension fromESRI
* Ionic Red Spider
*Kosmo (GPL)
*Manifold System
* Mapnik (LGPL )
* MapDotNet Server
*MapServer (BSD)
*MapGuide (LGPL )
* MezoGIS
*OpenJUMP (GPL)
*Quantum GIS (GPL)
*TerraLib (LGPL)
*TerraView (GPL)
*uDig (LGPL)See also
*
Well-known text and binary, descriptions of geospatial objects used within PostGISExternal links
* [http://postgis.refractions.net/ PostGIS]
* [http://www.postgresql.org/ PostgreSQL]
* [http://pgrouting.postlbs.org/ pgRouting]
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