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Just subtract the DEM from the DSM. As you said, DSM - DEM = CHM (DTM). No need to create points, just use the rasters. You can do this in ArcGIS Pro using the raster calculator: DSM - DEM https://www.earthdatascience.org/courses/use-data-open-source-python/data-stories/what-is-lidar-data/lidar-chm-dem-dsm/


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