The LAS files are indeed classified, but as specific as I am looking to do, nor are they 100% correct. The LAS files have classes of low, medium, and high vegetation, but there are only points of low vegetation, and zero returns that are classified as medium or high vegetation. I have been on the island and ground truthed many areas, and there are distinct areas of grass, and others of forested (high trees). Based on this, there should at least be some points classified as medium or high vegetation. The area I am investigating is a small island. The water around the island is also incorrectly classified as ground.
I am not sure if it is even possible to edit or correct the inherent classifications.
At this point, to distinguish habitats, I plan to create a DEM and a DSM, for the exact same area, and the difference between them should give different vegetation levels. Does this make sense?
In creation of a DEM from an LAS dataset, I need to use a filter, but I do not know what points to filter.
Oh, and I am still waiting on the metadata for the LiDAR data, when I receive it I will communicate its sources. Leading Edge Geomatics provided the data.