I have two polygons that are coincident. I want to merge them in to one polygon and delete the line that is between the two polygons; the merge didn't do it; it kept the line in between them. How do I get rid of this stupid line in ArcGIS 10.
Use the dissolve tool. Setup the dissolve without specifying a "dissolve field" so that attributes won't be taken into consideration when the dissolve process is performed. If you have to maintain borders between other polygons, specify a dissolve field where the two polygons in question have the same value.