[pdal] Conifer Identification/ return points that are below certain height below max veg height

[Sion Williams]

I'm trying to find a sneaky/elegant way of distinguishing Broadleaf and
Conifer trees from a 'Leaf Off' aerial survey made up of 27000laz tiles.
Looking at a transect example of the veg class there are no lidar returns
below a certain height for Conifers.(that are surrounded by other trees)

So any ideas how to filter(or add a dimension) the lidar below say 1.5m
below the max returns(this could be referenced to a tif file for max height)
and also the opposite for returning the top 1.5m values to then add to say
a grouping filter. which could then go towards a tree count or a learning
model.

For conifer identification i have also looked at the lidar Intensity values
but is a hit and miss process at the moment

Many thanks for any help given

Cheers

Siôn
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