Hi PostGIS Users,<br><br>Have what I hope is a simple problem that I'm not sure how to solve with PostGIS. I think I need to do a self-join on 0 overlap, but I'm just not certain.<br><br>Given a number of polygons, some overlapping, some not, I want to produce the geometries of all non-overlapping areas...ie all unique "pixels". This has specifically to do with catalogs of overlapping imagery over an area, where I have polygons for each scene and want to compute unique pixels. <br>
<br>Would I join a table with itself to achieve this?<br clear="all"><br>Cheers,<br>dylan<br>