I've been scouring the forums to see if there is a way to detect sharp, unnatural elevation changes greater than a certain amount in ArcGIS Pro. I've run across an issue in some DEMs where there are drop offs in a relatively flat area where there shouldn't be, likely due to mosaicking. Any suggestions?

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  • 4
    Slope tool then threshold the value?
    – Hornbydd
    Jan 23 at 16:37

1 Answer 1


Use the slope tool in Arc with D8 or Dinf checked, and output set as degree. It will generate a raster which you can then threshold in your raster calculator. These sharp changes are likely above 85° so you can use a conditional such as 'if('slope.tif' > 85, 1, 0)' such that (condition, 1 if true, 0 if false).

Assuming you want to investigate where these sharp lines are occurring, convert this new binary raster to polygon using the polygonize tool and apply a small buffer to highlight these areas encountering this issue.

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