[postgis-users] illustration for relations

[Nicolas Ribot]

> Are there any illustrative drawings available for the (GEOS or not) Geometry
> Relationship/Processing Functions in postgis?
> I've looked on http://geos.refractions.net/ on http://www.jump-project.org/
> (has some but not all) and tried with google, but to no avail.
> This seems like a basic part of documentation to me.
> Anyone?
>

A really nice source of information for such drawings can be found on
the JTS website.
The test suite is providing nice explanations of such relationships:

http://www.vividsolutions.com/jts/JTSHome.htm

Nicolas