[pdal] obtaining classifications from a .ept file

[Matt Beckley]

Hello all,

Just wondering if it is possible to get a list of all possible
classifications contained in an .ept file?

I've tried the 'summary' option:
pdal info --summary ept://
https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MD_VA_Sandy_NCR_2014_LAS_2015

it runs quickly and provides the metadata, but doesn't give the range of
available classifications.  A 'pdal info' without the summary option runs
for a long time and then crashes.

I also tried:
pdal info --stats --filters.stats.dimensions=Classification
--filters.stats.count=Classification ept://
https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_MD_VA_Sandy_NCR_2014_LAS_2015

But this also runs for a long time, and then crashes.

Sorry, but I'm still learning PDAL, and entwine, so there might be an
obvious answer that I just missed (or maybe it just isn't possible)?

Thanks,

matt.
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