Re: [pdal] Filters on LiDAR data for vegetation cover
Correct, there is no PDAL filter to isolate vegetation points amongst those classified as non-ground. Other filters, as suggested, may help to discriminate between buildings and trees, or misclassified non-ground. I've not done a lot of dense vegetation testing, but both PMF and SMRF should do reasonably well as long as points are making it all the way to the ground in the input data. Those filters, in my experience, struggle more with manmade structures than they do with vegetation.