PostGIS

Boston Geographic Information Systems

Checkout our PostGIS in Action book. First chapter is a free download

PostGreSQL Object Relational Database Management System

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PostGIS in Action is out in hard-copy,
download the first chapter
and SQL Primer for free. Tips and Tricks for PostGIS

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PostGIS

An opensource spatial extender for the PostGreSQL Database Management System developed by Refractions Research. PostGIS has also reached OGC compliance.

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SQL Cheat Sheet: Query By Example

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This Document is available under the GNU Free Documentation License 1.2 http://www.gnu.org/copyleft/fdl.html & for download at the BostonGIS site http://www.bostongis.com