Global Mapper v24.1

Can you explain LIDAR scan angle range?

I'm trying to filter LIDAR data based on scan angle so that I only get points that are directly below (nadir) the scanner. Global Mapper suggests that a number between -180 and 180 is required, but I'm having a hard to time understanding what this means.

Is the 0° scan angle straight down, or straight up, or something else? Thanks.


  • By the way, my lidar processing software thinks 0 is straight up and offers values from 0 to 360... So I'm not sure if this is based on a proprietary standard or if scan angle is based on some file format standard?