Welcome to the Users PostGIS Wiki!

Everybody is welcome to contribute to this wiki.

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What is PostGIS?

PostGIS is an extension to the ​PostgreSQL object-relational database system that allows ​GIS (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.

• ​Foss4G 2009 State of PostGIS talk

Overview

• ​PostGIS Manuals
• Features of PostGIS
• PostgreSQL/PostGIS GEOS/PostGIS version support matrix
• PostGIS Tutorials
• ​PostGIS as a part of PostgreSQL (Article)]
• Tools that support PostGIS
• Gallery Collection of applications using PostGIS in the backend.
• PostgreSQL Case Studies
• PostGIS Hosters
• PostGIS Support and Consulting Services
• ​PostGIS Wikipedia entry
• PostGIS and ArcSDE/ArcGIS 9.3 Articles
• ​PostgreSQL general use user contributed functions and snippets

Contrast / Compare / Port Guides

Don't know if PostGIS is right for you or if another spatial db is more suited or you are porting from another/going to another and not sure the gotchas

• ​SQL Server 2008, PostGIS, MySQL function/feature Spatial compare
• ​Simon Greener's FOSS4G 2009 talk on Oracle Spatial/Locator and gotchas for porting between PostGIS/Oracle - complete with slides and sound

Compilation and Installation Guides

• Directions for PostGIS RPM Installation.
• Directions for PostGIS on Ubuntu.
• Directions for Compiling in Windows.
• Issues with Installing on Windows Vista Windows Vista Gotchas.
• Directions for ​Compiling PostGIS from source under/CentOS/Fedora/RedHat EL After Yum Install of PostgreSQL.

PostGIS Books

• ​PostGIS official manuals for all versions and for PostGIS JDBC driver.
• ​PostGIS in Action Due out in hard-copy Summer 2010. Manning Early E-Book purchaseable now.

Examples of Spatial SQL

• Find Nearby Features
• Find Nearby Features in Lat/Lon (EPSG:4326)
• Find Features far from nearest neighbor - Anti-Near Neighbor
• Join Spatial and Non-Spatial Tables
• Overlay Geometries in one table with Geometries in another
• Find Features Inside a Particular Polygon
• Clean Invalid Polygon Topology
• Find points on interior rings within a certain distance to exterior ring
• Splitting a Polygon with a Linestring
• Generating a hexagonal grid
• MultiPoint centroids from Multi geometries
• Examples OGR Examples
• Create a network topology from a set of noded linestrings
• Geocode a point along a line with a left/right offset
• Determining spikes in polygons
• Searching for spikes and removes them

Extending PostGIS

• PostGIS EJB3 Integration
• Postgis Topology - to be moved somewhere else ;)
• Raster support
  • WKT Raster - The new proposed raster implementation in PostGIS
  • ​PGCHIP - The GDAL Postgis driver for raster data - a corrected version can be found in current GDAL CVS
• WishList of features for the future.
• Code Sprint 2009 Notes

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?
• How to get distance measurement in meters?

Extras

• Geocoder TigerGeocoder

Notes

• Spatial Algorithm Web Sites

Useful Additional PL/PGSQL Functions

• PL/PGSQL Functions
• Neighbor Search Nearest Neighbor Search
• PL/PGSQL Pseudo Cascade Union Aggregate Function (use for pre-PostGIS 1.4

What is GEOS

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