From PostGIS in Action, Third Edition by Leo S. Hsu and Regina O. Obe
In this article, you’ll learn what a topology is, how to build a topology from scratch, and how to use commonly available geometry data.
By Chris Garrard
This article, excerpted from the book Geoprocessing with Python, will show you how to use OSR to assign SRS information to your data so that GIS software, including OSR, and know how to work with it.
Using spatial references with OSR (PDF)
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