Preface
PostGIS (pronounced post-jis) is a spatial database extender for the PostgreSQL open source relational database management system. It’s the most powerful open source spatial database engine. It adds to PostgreSQL several spatial data types and over 300 functions for working with these spatial types. It does for PostgreSQL what Oracle Spatial/Locator does for Oracle, what IBM DB2/Information spatial DataBlades do for DB2 and Informix, and what geometry/geography types packaged in Microsoft SQL Server 2008+ do for SQL Server. PostGIS supports many of the OGC/ISO SQL/MM-compliant spatial functions you’ll find in these other OGC-compliant databases as well as numerous additional ones that are unique to PostGIS.
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