"Buildings and vegetation are removed, revealing the underlying topography."
I understand how vegetation could be removed, but buildings? How is that accomplished?
I understand how vegetation could be removed, but buildings? How is that accomplished?
https://desktop.arcgis.com/en/arcmap/latest/manage-data/las-...
There will be a different algorithm for each feature class. For example, points that are part of a building might be identified by finding groups of points that form a very flat surface. ML models can also do this based on training data.
https://pro.arcgis.com/en/pro-app/latest/tool-reference/3d-a...
The final digital elevation model (DEM) is then just taking the "Ground" class from the classified point cloud and using them to triangulate a surface. This differs from a digital surface model (DSM), which will triangulate a surface based on ground+building+vegetation points.
It the Scotland we have heather that can coat hills but I’m not sure that you’d be able to tell the difference between that and a forest canopy to assume a height and then subtract. Maybe there’s more than the point cloud to work with.
With this information, you can filter the point cloud to only include points from the final return, which is likely to be the ground/a solid surface unless the vegetation is very dense.