I am using ArcGIS Desktop 10.0.

I have two polygon layers showing storm surge and I want them both to be combined to look like a smooth transition into each other. However, they have an overlap and it makes the appearance of them poor if they are combined using merge or union.

Would it be easier to convert them into rasters and perform a calculation through that?

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  • How do you want to combine different overlapping values - mean, max, etc.? Also, what software are you using?
    – phloem
    Commented Apr 25, 2018 at 17:24
  • @phloem Mean for sure. I just want the values to be continuous across the region. But I also don't want there to be double the cell values where the overlap occurs. I am using ArcGIS 10.0 Commented Apr 25, 2018 at 17:33
  • What do you mean that the appearance is poor when you use union? Is it the sharp breaks you don't like?
    – phloem
    Commented Apr 25, 2018 at 18:35
  • @phloem Yea when I used union there was a very sharp break between the features and it didn’t look natural. Commented Apr 26, 2018 at 2:17
  • In that case, I'd consider converting to raster, combining, then smoothing.
    – phloem
    Commented Apr 26, 2018 at 15:40

1 Answer 1


you can accomplish it using this tool. http://pro.arcgis.com/en/pro-app/tool-reference/analysis/symmetrical-difference.htm


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