I am trying to improve the DSM by removing trees from being used in final DSM. I am not able to use the DTM as I find that it introduces huge errors in its smoothing algorithm (like 8 meters). The DSM looks great, but I need a clean surface (no trees are significant shrubs) as I am trying to create a surface model that will be used for mine planning. The area covers about 1,000 hectares and is mostly good for the surface (low grass, gravel roads) but on north facing slopes I have a significant amount of trees and taller shrubs. But, I still have probably 3000 trees that show up in the DSM. I have Global Mapper and thought about tracing contours that reliable (Taking out the tree influence), but I see this taking a good solid week. Any easy way to remove trees in a timely way? I have attached some images showing DSM, DTM, Ortho.
If anyone has other ideas, including using 3rd party software, it would be greatly appreciated.