topic Re: How to calculate intermediate polygon between two polygons using ArcGIS in Geoprocessing Questions

How to calculate intermediate polygon between two polygons using ArcGIS

SlobodanKomatina1 — Thu, 31 May 2018 15:39:56 GMT

I have a two polygons, the big one and the small one inside of the big one. Now I want to create the new polygon which is on the average middle between these two (big and small). I have used Erase tool to create just one donate polygon (without the small one in the middle) and to create negative buffer, but that is not a good idea. New polygon should have some mix of geometries between small and big one.

NOTE that these two polygons doesn't have the same geometry.

All of these I want to finish using ArcGIS.

Re: How to calculate intermediate polygon between two polygons using ArcGIS

DanPatterson_Retired — Thu, 31 May 2018 15:51:17 GMT

Not clear... you say you want to do this in QGIS ...

perhaps try their discussion group https://gis.stackexchange.com/

Re: How to calculate intermediate polygon between two polygons using ArcGIS

SlobodanKomatina1 — Thu, 31 May 2018 16:07:07 GMT

Sorry, I have edited question now.

Re: How to calculate intermediate polygon between two polygons using ArcGIS

ChrisDonohue__GISP — Thu, 31 May 2018 16:28:56 GMT

Just a quick workflow idea that could be tried if you have access to Spatial Analyst or 3D Analyst. Untested, but I think this could work. It would need to be fleshed out with the specific processes (this is just the basic process).

Convert the polygons to lines
Combine into one feature class (if not already)
Add an integer field called "Elevation"
Populate one line with zero and the other with 100
Convert the lines to a surface (raster)
Contour the surface, specifying an elevation of 50. This will essentially produce the result you are seeking.
Convert to vector, then Convert the lines back to polygons.

Chris Donohue, GISP

Re: How to calculate intermediate polygon between two polygons using ArcGIS

SlobodanKomatina1 — Thu, 31 May 2018 17:20:17 GMT

Fantastic idea! Could you tell me which tools are the best to use to create the surface and which one to create 50m elevation Contour?

Re: How to calculate intermediate polygon between two polygons using ArcGIS

mneer — Thu, 31 May 2018 18:47:36 GMT

Just edit the polygon using Edit Toolbar, select the smaller/inner polygon. Once selected under Editor Toolbar select CLIP. You have a choice to Preserve or Discard the area of intersection. Discard it and calculate the area Easy Peazy