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Calculate slopes in GM18?

csherwoodcsherwood Posts: 14
in Elevation Data
I have an elevation grid (DEM) and want to calculate the slopes for the whole map (not just view them). I keep seeing references to export in "Float/Grid format" and checking the "slopes" option...but my export options don't include either of those choices. How do I make a raster of slopes and slope directions?
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Best Answer

  • bmg_bobbmg_bob Global Mapper Programmer Posts: 2,233
    Answer ✓
    Hello,

    Try this:
    1. File | Export | Export Elevation Grid Format...
    2. Select Export Format dialog, choose Float/Grid File
    3. Click OK
    4. Float/Grid Export Options dialog has several options related to exporting slope or slope direction values instead of elevation.  Are you saying that those options are not on your Float/Grid Export Options dialog?
    I used Global Mapper v18.2.1 (b070617) [64-bit] [+Lidar] - REGISTERED

    Cheers,
    Bob

Answers

  • csherwoodcsherwood Posts: 14
    Thanks. I was stuck thinking that the Export Format pull down was only specifying the file format. It seems like it would be more direct to allow that as a calculation under Analysis that could then be exported in any raster format, but this works.
  • suresh_d7suresh_d7 Posts: 6
    how to get the slope by percentage
  • bmg_bobbmg_bob Global Mapper Programmer Posts: 2,233
    suresh_d7 said:
    how to get the slope by percentage
    Hello,

    On the Float/Grid Export Options screen, choose "Export Slope Values Instead of Elevations" and "Export Percent Slope Values Rather than Degrees".

    Cheers,
    Bob
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