2

I am trying to come up with the best process for identifying aerial sewer lines (typically over streams) using the pipe inverts and a LiDAR-derived DEM. In other words, locate the lines where the Z value is greater than the elevation of the DEM. I came up with the following workflow that involved converting the sewer lines to points and comparing the Z value of each point to the associated (=extract values to points) DEM elevation, which resulted in identifying SOME of the aerial lines, but many were missed and I am looking for a "best practice" workflow.

A colleague has suggested the various tools from the hydrology toolset: flow distance, slope/aspect, flow direction, then flow accumulation.

I am also curious if anyone out there has some ideas about to identify aerial sewer lines using the pipe inverts and DEM.

DEM - exaggerated symbology to show elevation changes.

enter image description here

Improve this question
2
  • Do you want to see the properties of the DEM or an image of the DEM itself?
    – slowe
    Jan 17, 2022 at 18:56
  • 1
    Uploaded images. I exaggerated the colors of the DEM to show elevation changes at the point of crossing.
    – slowe
    Jan 19, 2022 at 12:53

0

Reset to default

Your Answer

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

Browse other questions tagged or ask your own question.