Merge smaller polygons that are within a larger polygon

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04-11-2015 03:46 PM
MalcolmLittle
New Contributor III

Hello,

I am trying to find the best way to merge small polygons into one polygon. They have to be merged to match provincial subdivisions. What I'm working on you can see below:

BC combined layers.jpg

So I have to merge the little aquamarine polygons into one for each subdivision, delineated by the grey lines. There are roughly 3260 aquamarine polygons, and 153 subdivision polygons. In the end I would need 153 (or less since some subdivisions do not contain aquamarine polygons) aquamarine polygons.

Any thoughts on how?

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SepheFox
Frequent Contributor

Hi Malcolm, I would do a spatial join, using your aquamarine polygons as the target, and the subdivisions as the join features. That will put the subdivision info into each polygon in your other layer. Then I would dissolve your little polygons, using subdivision ID, or name or whatever unique ID they have, as the dissolve field.

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SepheFox
Frequent Contributor

Hi Malcolm, I would do a spatial join, using your aquamarine polygons as the target, and the subdivisions as the join features. That will put the subdivision info into each polygon in your other layer. Then I would dissolve your little polygons, using subdivision ID, or name or whatever unique ID they have, as the dissolve field.