So I have two shapefiles that show storm surge height values for two different areas. Nevertheless, they overlap for a good portion of their areas. When I merge them together, it seems that the polygons in the overlap area default to showing the maximum height.

Is there a way for them to instead average together so the overlap can be an average of polygons from the different shapefiles rather than the maximum values?

  • what software are you using? – JamesPatrick May 23 '18 at 13:25
  • ArcMap 10.6. I also can load the data using ArcGIS Pro if that has more capabilities for something like this. – Daniel Katleman May 23 '18 at 14:09
  • when merging there should be an option to select average – neogeomat May 23 '18 at 14:21
  • @neogeomat do you know where? It might be in the field map part but I haven't seemed to locate it. – Daniel Katleman May 23 '18 at 14:38
  • 1
    Please check these answers – Moh May 23 '18 at 20:01

Figured it out!

I ended up performing a union on the two layers. Then I added a new field, selected only the polygons that overlapped, and performed a field calculator averaging the height values from the two separate layers on only those selected polygons.

  • Accept your own answer with the checkbox! – BERA Aug 26 '18 at 9:28

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.