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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.

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if merge didn't work they are not coincident. remember it is a computer. the lines can't just be coincident. they must be exact duplicates.every vertex must be the same. – Brad Nesom Dec 28 '11 at 23:15

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.

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