[pdal] Pdal writers.ept_addon question

[JR Hickey]

Hi,

I can’t seem to get pdal’s writers.ept_addon to add the Classification
dimension to my existing ept data set.

Let me explain my current workflow (I know it is not optimal, but we are
working on it). 1) First a field team gathers Lidar data; then does a first
pass to convert the Raw to las data. 2) Then the data is added to an ept
structure. 3) Eventually (weeks or months after) another team will extract
part of the data and do a manual classification. 4) Now I would like to add
the classification information to the existing ept structure.

I have looked at the examples online (pdal.writers.ept_addon and FOSS4G
2019 Bucharest slides) and still can’t seem to make it work.

My pipeline is this as follows

[{             “type”:”readers.ept”,

                “filename”:”~/entwine/existing_data/ept.json”

},

{              “type”:”writers.ept_addon”,

                “addons”:{“~/entwine/Classified_data”: “Classification”}

]

The process takes a little time and I get no error messages. But when I
extract the dataset to laz, there is no classification information.

Something of note, in the entwine ept-data of the Classified_data, for each
x-x-x-x.laz file, there is a x-x-x-x.bin that was created. Is this normal,
what is in the bin?

Another bit of information, I have previously sorted (using GPStime) the
data to ensure that the octrees contain the same points in the
existing_data and Classified_data.

Thanks for any help. I am really stumped on this one.

JR
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