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Merging small polygons with biggest adjacent polygon using ArcGIS Desktop?

Jose_AlbertoNúñez

I have a polygon shapefile classifieds in different regions, and cities inside them. In each city there are many small polygons <2ha, that I'd like to merge to the biggest polygon adjacent to each one of them, as long as these polygons belong to the same city and region.

I don't want that polygons neighbors located in different city and region be united.

I'm looking for an automatic solution. I tried eliminate tools but ArcGIS does not differentiate the union between cities and regions.

Any ideas?

thanks

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Jose_AlbertoNúñez

Hi @Joshua Bixby

Thank you. Yes, i can do it that you talk me, but the problem is that i have 190 cities, so i need repeat the proces 190 times, it is so much time to do it. I would like to find a automatic solution because is a problem that i usually have.

Thank you

JoshuaBixby

Jose, I understand now the limitation you are running into with using selections. Just brainstorming, but what about the following:

Make Feature Layer using a WHERE clause to limit records to given region and city
Select By Attribute to select small polygons.
Eliminate to merge the small ones into larger ones in same
Delete tool to remove feature layer
Repeat steps 1-4 for each region/city pair

Jose_AlbertoNúñez

Thanks Joshua Gardner Bixby I tried Modelbuilder with Iterate Feature Selection on region and cities, where ArcGIs select regions and cities iterate form, but them i need select micro polygons there, a second selections to use Eliminate> I could not do it, in the secod selection ArcGis use all polygons. I do not know python, can you help me please? Than you

Jose_AlbertoNúñez

Thanks Mir Hashmi‌ You are right, the cities are inside regions. I do not know python. Could you help me with the script? thank you

JoshuaBixby

Have you tried running Eliminate after creating a selection set for all polygons that have the same region and city? I suspect that would work. If so, you could write a Python script to automate the selections and using Eliminate.

MirHashmi

If you are looking for automation, this can be achieved through a python script that will loop through all the city polygons and filter out the polygons except the selected city and run the union over them. This is based on an my understanding that Cities are inside Regions and you need to merge all those smaller polygons inside city polygons.

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