The struggle is real… especially in low brush and tall grasses.
- What’s your point density look like in the wooded area?
- What’s the brush density?
- Method of ground truthing survey within the trees?
- Fallen trees vs rock out crops?
one thing to try is run classification in a couple other programs and carefully check in Cross-X. PS you can upload a ground extracted point cloud to another project in RockCloud, do a compare command, and directly look at the different ground extractions in those problem areas.
That’s where I’d start when facing deviations like that.