Calculate slopes in GM18?

csherwood

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?

bmg_bob

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

csherwood

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_d7

how to get the slope by percentage

bmg_bob

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