Drape DTM 2.0 gx

JenniferHare1
JenniferHare1 Posts: 2
in Oasis montaj

Hi,

Does anyone know if the Oasis Airborne QC tool- 'Calculate Draped Survey Altitude' uses the Canadian Geological Survey's Drape DTM v.2.0 gx or algorithm? The CGS's doc for Drape DTM v.2.0 refers to drape_dtm.gx but I cannot find this gx.

Just wondering if it is the same tool as found in the Airborne QC extension.

Thanks,

Jennifer Hare,

NV5 Geospatial

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Best Answer

  • FrankKiss
    FrankKiss Posts: 1 Diamond Rank Badge
    Answer ✓
    URL https://doi.org/10.4095/295442

    Geological Survey of Canada of_7690, Drape DTM 2.0: software to calculate a smooth drape surface for an airborne geophysical survey, Authors: Dumont, R., Z. Bardossy (2014), select Download(s) of_7690.zip (750.4 KB)

Answers

  • JenniferHare1
    JenniferHare1 Posts: 2

    Thanks Frank! Was able to get that gx and will test it. Much appreciated.

  • ElizabethBaranyi2
    ElizabethBaranyi2 Posts: 16 mod

    This is a tardive reply, intended for the benefit of future perusals.
    The "Calculate Survey Drape Altitude" of the Om Airborne QC workflow is not the same as Drape_DTM.gx published by Dumont of the GSC. The Om tool operates on a GDB path and not on a DEM grid. The application notes of "Calculate Survey Drape Altitude" describe the equation as illustrated below, with a minimum limit imposed on the smallest radius covering a valley. Since it operates on a GDB it does not take into account ensuring survey/tie line intersections are at the same drape elevation. Maybe a future improvement

    image.png

    As an example see illustration below:

    image.png

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