Documentation

Stable Branch User Documentation

This documentation is for the released branches and will contain corrections and errata as they are available

PostGIS 2.4 (HTML) (PDF) (EPUB)
PostGIS 2.3 (HTML) (PDF) (EPUB)
PostGIS 2.2 (HTML) (PDF) (EPUB)

In Development User Documentation

This documentation is for the unreleased version currently under development, and is frequently updated and changed. Work is in progress for other languages: Italian, French, Portuguese, Japanese, German, Korean, Spanish, Polish and more coming. To signup to help translate the manual into your language of choice go to PostGIS Transifex

PostGIS 2.5
Translated versions are a work in progress and ordered by completeness of the translation
HTML: en ja br de ko_KR es it fr
PDF: en br de it es fr
EPUB: en
Reference Section
Raster Reference Section
Topology Section

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Getting Help

Free and Commercial Support

Tutorials & Cheatsheets

Books

Mastering PostGIS - covers PostGIS 2.2, released in May 2017, English
PostGIS In Action 2nd Edition - 2nd Edition (Covers PostGIS 2.0-2.1, PostgreSQL 9.1-9.3 (highlights of 9.4) - Released April 2015 English
PostGIS Cookbook Released January 2014 (covers 2.0-2.1) English
PostGIS 2 Analisis Espacial Avanzado - (PostGIS 2.0 released April 2013) Spanish
PostGIS Essentials - (PostGIS 2.2 released April 2015)

Web Sites

Planet PostGIS - keep a pulse on what people are saying about PostGIS and learn how to take advantage of new features as they are added.
GIS Stack Exchange may already have your answer: search before you ask!

PostGIS

Spatial and Geographic objects for PostgreSQL