DSM to DEM
Belldesigncompany
Global Mapper User
Does GM have a filter or process that creates a bare earth DEM from DSM LiDAR data? we are experimenting with aerial LiDAR data from UAVs and need bare earth data from the LiDAR.
Processing the RAW data is a new step to me.
Processing the RAW data is a new step to me.
Comments
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You can use the automatic ground classification option on the Lidar module toolbar (you must have a Lidar module license) to automatically identify a large percentage of the ground points in an unclassified point cloud. You can then grid the ground points to get a bare earth DEM.
You can also use the Lidar module's binned gridding to do a minimum value bin grid (DTM) with a somewhat large spacing value (maybe 5 times the native point space) to get something close to a bare earth DEM in most locations. The exception would be the surface of large buildings where all points within the bin grid spacing are well above the ground.
Thanks,
Mike
Global Mapper Guru
geohelp@bluemarblegeo.com
Blue Marble Geographics for Coordinate Conversion, Image Reprojection and Vector Translation -
Thanks, We'll check into that.
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