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I have a polylineZ feature that represents sewer lines. I am looking for areas where points along the line may be above ground elevation, representing aerial lines. The problem is that I need to compare points along the line, maybe every 5-10 feet, not just the vertices. If I only compare the elevation at the line vertices, these will usually be at ground elevation because they are where the manholes are located.

Any suggestions?

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  • Are you using the 3D Analyst extension with ArcGIS Pro or with ArcGlobe/ArcScene/ArcMap?
    – PolyGeo ♦
    Commented Sep 12, 2021 at 21:53
  • I can use 3D Analyst with either Pro or ArcMap. Thank you for responding!
    – slowe
    Commented Sep 16, 2021 at 11:42
  • as a workaround, you could use "densify" first.
    – radouxju
    Commented Sep 16, 2021 at 12:23
  • I came up with a possible workflow, but would love feedback on this, I have tested on a subset, but not for the entire dataset yet.  Run Add Z Information  Run Stack Profile (generates a table with elevations of DEM along line every 10 feet)  Join the Stack Profile table to the line feature by LINE_ID to FID  Locate lines where the Z_Max from the line is greater than the Z value from the stack profile.
    – slowe
    Commented Sep 17, 2021 at 15:12

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