- I'm using Ubuntu Linux and have installed QGIS 3.22 which has native support for LAS files. I think that LAStools is for MS Windows only?
- I can load the LAS data and see a pretty image.
- Next, I want to use the ground classified spot heights to make a Digital Elevation Model, e.g. this procedure which requires a shapefile.
- Is there some way to extract ground classified XYZ from the LAS and save that as a shapefile? Or is there some other way to create a DEM? This is looking too difficult for me.
- I installed PDAL (Point Data Abstraction Library). PDAL is free, open source and includes lots of modern tools for point cloud data. PDAL is run from a terminal, which makes it fast (large datasets are difficult in QGIS).
- I followed the instructions here for creating a DEM and, with reference to the PDAL website, I quickly learned how to write the JSON 'pipelines' (scripts). PDAL also has filters for Delaunay triangulation and interpolation of that output (in more recent versions).
I recommend PDAL for processing point cloud data.