Global Mapper v24.1

Creating a bare earth (DTM) tif file

Hi there,
I imported a .las file from generated by photogrammetry.  I chose the Binning option to create a bare earth surface.
Looking at the generated grid, it looks good and has excluded most of the vegetation - I'm interested in the topograpghy of the river bed so the vegetation shown on the banks is not a problem.
Then when I export the grid as a tif and open it up in other software it has a zig zag profile in cross section so it useless to me. 
I've tried all the different export settings and no luck.
Any ideas?


  • bmg_bob
    bmg_bob Global Mapper Programmer

    I'm not sure what you mean by a "zig-zag profile". Could you post a screen capture of the data?

    Also, when you export a grid to GeoTIFF, be sure to select the option to export 32-bit floating point pixels, especially if you are using units in the range of feet or meters.