<h2>PostGIS in Action: PostGIS Online SQL tutorials</h2>
<p><a href="http://www.postgisonline.org/" target="_blank">PostGIS
Online</a> is a project started by <a href="http://blog.jordogskog.no/" target="_blank">Nicklas Avén</a>.</p>
<p>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.</p>
<p>For example type in an SQL statement such as:</p>
<code>
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
</code>
<br><br>
<p>Then click the Map 1 button and watch as the geometry is drawn on the
screen.</p><a href="http://www.postgis.us/page_postgis_online">http://www.postgis.us/page_postgis_online</a><br><br><a href="http://www.postgisonline.org/">http://www.postgisonline.org/</a><br clear="all"><br>-- <br><a href="http://thusbeginstheweb.blogspot.com/">http://thusbeginstheweb.blogspot.com/</a><br>