"snapping" polygons together

Question

I have a set of polygons representing administrative districts. The districts were digitized by hand, and there are small spaces between polygons where the polygons should be touching. There are probably also overlapping polygons. How can I have the polygons snap together, filling the gaps and removing overlap?

QGIS / ArcGIS or Python library solution preferred (but algorithm suggestions welcome)

I have asked this question at gis.stackexchange.com. There doesn't seem to be a tool to do this, so I'm also looking for a computational geometry approach to implement myself. — zoo, Jun 14 '11 at 14:51
Ok, fair enough. Sorry if my first answer was a bit impolite. — steenhulthin, Jun 14 '11 at 15:36

score 5 · Answer 1 · answered Jan 12 '12 at 07:37

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I know this post is 6 months old but ayway, you can use the Integrate tool in ArcGIS which should do what you want.

answered Jan 12 '12 at 07:37

Martin Gunia

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great solution because it doesn't require a special license and should be the accepted answer – f.thorpe May 18 '21 at 20:07

score 3 · Accepted Answer · answered Jun 27 '11 at 07:02

Old school ArcInfo had a "clean" function - I think they did the same thing in geoprocessing if you use a geodb. In that function you set a tolerance for snapping lines and points together. The clean gets rid of all those slivers (the technical term for what you are talking about).

For Qgis:

This thread should be of some help to you http://hub.qgis.org/issues/3126

steenhulthin · Answer 3 · 2011-06-14T15:33:28.373

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You can find a tool in the ArcGIS world called: geometry repair. You can use the python API.

edited Jun 14 '11 at 15:33

answered Jun 14 '11 at 15:25

steenhulthin

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But this tool repairs corrupted files, fixing invalid geometry in single features. It does not help with the problem in the question. – MarkJ Jun 15 '11 at 20:11

"snapping" polygons together

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