I have been trying to remove artefacts from a published DTM but it is proving problematic. One can run a band-pass filter to remove short wavelengths but it tends to affect a lot of the data.
If anyone has some experience of producing a true “bare-earth” model that would be great. I do not have the original LiDAR data.
Attached an example of the Ordnance Survey DTM for Avebury Circle in Wiltshire, UK.
Thanks for any pointers