The Sandbox

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!!What is PostGIS

PostGIS is an extension to the [PostgreSQL | ​http://www.postgresql.org] object-relational database system that allows [GIS | ​http://en.wikipedia.org/wiki/Geographic_information_system] (Geographic Information System)
objects to be stored in the database. PostGIS does for PostgreSQL what Oracle Spatial does for Oracle, ArcSDE does

for Microsoft SQL Server/Oracle.

!!Overview

• [Features of PostGIS | FeaturesOfPostgis]
• [PostGIS as a part of PostgreSQL (Article) | ​http://www.postgresonline.com/journal/index.php?/archives/7-PostGIS-for-geospatial-analysis-and-mapping.html]
• [Tools that support PostGIS | ToolsSupportPostgis]
• [Gallery] Collection of applications using PostGIS in the backend.
• | PostgreSQL Case Studies
• [PostGIS Hosters | PostGISHosters]
• [PostGIS Wikipedia entry | ​http://en.wikipedia.org/wiki/PostGIS]
• [PostGIS and ArcSDE/ArcGIS 9.3 Articles | Postgisarcgis]

!!Installation Guides

• Directions for [PostGIS RPM Installation|PostgisRpmInstallation].
• Directions for [PostGIS on Ubuntu| PostgisOnUbuntu].

!!Examples of Spatial SQL

• [Find Nearby Features|ExamplesFindNearby]
• [Find Features far from nearest neighbor - Anti-Near Neighbor | ExamplesAntiNear]
• [Find Overlapping Features|ExamplesFindOverlapping]
• [Join Spatial and Non-Spatial Tables|ExamplesJoinTables]
• [Overlay Geometries in one table with Geometries in another|ExamplesOverlayTables]
• [Find Features Inside a Particular Polygon|ExamplesInsidePolygon]
• [Clean Invalid Polygon Topology|CleanPolygons]

[Find points on interior rings within a certain distance to exterior ring|ExamplesInsidePolygon2]

• [Splitting a Polygon with a Linestring|SplitPolygonWithLineString]
• [Generating a hexagonal grid|GenerateHexagonalGrid]
• centroids from Multi geometries |ComputeMultiCentroid
• [OGR Examples]

!!Extending PostGIS

• [PostGIS EJB3 Integration| SpatialEJB3]
• PostgisTopology - to be moved somewhere else ;)
• [Raster support|RasterNotes]

[WKT Raster - The new proposed raster implementation in PostGIS|WKTRasterHomePage] [PGCHIP - The GDAL Postgis driver for raster data | ​http://simon.benjamin.free.fr/pgchip/] - a corrected version can be found in current GDAL CVS

• [WishList] of features for the future
• [Code Sprint 2009 Notes|Sprint2009Notes]

!!Newbie Common Problems and Questions

• [function addgeometrycolumn("unknown", "unknown", integer, "unknown", integer) does not exist]
• [What is the measurement returned by ST_Distance?]
• [What unit of measurement do PostGIS functions use? | PostGISFunctionMeasurement]
• [How to get distance measurement in meters|distance_in_meters]

!!Extras

• | Tiger Geocoder

!!Summer of Code

• [SummerOfCode2006]

!!Notes

• SpatialAlgorithmWebSites

!!Useful Additional PL/PGSQL Functions

• [PL/PGSQL Functions|plpgsqlfunctions]
• [Nearest Neighbor Search]
• [PL/PGSQL Pseudo Cascade Union Aggregate Function | upgis_cascadeunion]

!!Known issues/patches pending review

• [IssuesPatchesPending]

!!What is GEOS

[GEOS] is a C++ port of the JTS Topology Suite. It is used by PostGIS to implement Topological functions.

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