[GRASSLIST:3149] processing of LIDAR data

[Robert S. Nuske]

Dear list,

Does anybody has any experience with LIDAR data processing within GRASS or
could point me to any resources?

I am looking especially for ways to extract a DTM from LIDAR data of
forested areas, but also for any general advice on LIDAR data processing
within GRASS.

My main problem at the moment is still the extraction of a DTM (points
representing the bare earth) from the LIDAR point cloud. So, I am looking for
ways to filter effectively point clouds. I will use LIDAR data of dense Sitka
spruce stands. This data has a quite high overall point density (3-4 points
per sqm), but the number of ground hits is naturally very low ("penetration"
rate less than 20%).

The only thing I have read so far is the GRASS Book (Open Source GIS: A GRASS
GIS approach) and Brovelli's paper (LIDAR Data Filtering and DTM Interpolation
Within GRASS). 


Thanks for your comments.
Robert

____________________________________________
 Robert S. Nuske
 
 Forest Research
 Northern Research Station
 Roslin, Midlothian EH25 9SY  
 Scotland, UK

 email: robert.nuske at forestry.gsi.gov.uk 
____________________________________________