Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I dissolved the polygons specifically to get a unified outline without any interior boundaries showing. Now I've got a partially broken interior line within the polygon.

This is for cartographic display reasons; I know that I can display the polygon without a boundary, but I'm already using that technique to display another layer in the map.

I used the dissolve tool in ArcMap 10 (ArcInfo) SP4.

Why does this tool leave artifacts of previous polygon boundaries??

Polygon artifacts

share|improve this question
up vote 8 down vote accepted

There was a sliver between the original polygons. You will have to edit those vertices out.
You could use the eliminate (arcinfo).
Also this question has some direction
Also another direction to what you did would be the trace command (resources.esri)

share|improve this answer
That is to say they need to exactly share that border? – Roy Jun 18 '12 at 13:58
yes, that is how dissolve works. I think there is a tolerance seting but from my old school experience you don't have much control over how the tol is applied. – Brad Nesom Jun 18 '12 at 14:11
Thanks, I inserted vertices on one of the polygons with snapping and everything went through the second time. – Roy Jun 18 '12 at 14:14

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.