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Dissolve tool keeps missing out two polygons

- - - - - ArcGIS dissolve polygon

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I'm trying to dissolve polygons based on a code number in the attribute table.


It all works well, with an exception of two polygons that fail to dissolve - they literally drop out from the output. It affects always the same two polygons. The dissolve process is successful, the layer is generated, just with two "holes" in it. ArcGIS does not give me any error message or anything.

I have tried messing with the source dbf file to see whether there are perhaps some funky characters in the code field, but it seems to be fine. The code is really just a simple number (12 and 707 specifically).

The only thing that seems to have perhaps some relevance is that both of those missing polygons happen to be parts of large cities, therefore they consist of higher number of small polygons to be dissolved (but still nothing that ArcGIS could not handle). Other than that I have really zero clue what could be wrong...

Any hint, tip or idea would be much appreciated! Thanks!

I'm using ArcGIS 9.3





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Have you tried to repair the geometry?

Hugo Ahlenius
Nordpil - custom maps and GIS

Matthew Hampton

Matthew Hampton

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Maybe try a sequential dissolve?  Or remove the offending poly's and dissolve them separately, then append?

co-cartographic creator of boringmaps.com

Also tagged with one or more of these keywords: ArcGIS, dissolve, polygon

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