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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
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    Please check these answers – Moh May 23 '18 at 20:01
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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

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