PostGIS Online is a project started by Nicklas Avén.
This site will allow you to dynamically try PostGIS SQL statements on line without even installing PostGIS. You can try some of the examples in chapter 2 of our book that are self standing examples and watch these dynamically displayed on a map.
For example type in an SQL statement such as:
SELECT ST_GeomFromText('POLYGON((-0.25 -1.25,-0.25 1.25,2.5 1.25,2.5 -1.25,-0.25 -1.25), (2.25 0,1.25 1,1.25 -1,2.25 0),
(1 -1,1 1,0 0,1 -1))') As the_geom
Then click the Map 1 button and watch as the geometry is drawn on the screen.
Stay tuned for our next book pgRouting: A Practical Guide published by Locate Press due out 1st or 2nd quarter 2017. Preview drafts available. Content is now feature complete.
© Leo Hsu and Regina Obe 2014