[postgis-users] PostGIS 1.3.3 on Windows XP Unstable

[Bresnahan, Mike]

> How the hell do you get it to do a real union?

Heh. Intuitive ArcMap is not. It took me forever to figure it out as well. You can do a union a couple different ways. The way that seemed to work the best for this is to:
 
1) Run ArcMap
2) Add the shapefile to your map
3) Open the edit toolbar.
4) Click on Start Editing.
5) Select the entire dataset by left clicking and then dragging a rectangle around the geometry.
6) Select Union from the menu on the edit toolbar.
 
You should see the union happen right before your eyes.
 
I think I tried the Union Tool like you did and didn't get what I expected. I think it just did a union on each individual feature instead of doing an aggregate union.
 
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