[pdal] PDAL v2 spatial reference difference

[Evert Etienne]

Dear all,

I have a question about some behaviour I don’t understand when using PDAL.
We are in the middle up updating PDAL from 1.8.0 to 2.1.0. We have some unit tests checking the spatial reference system reading in our code.
In 1.8.0, the spatial reference read (using info—metadata `spatialreference`) from a test pointcloud (https://pdal.io/tutorial/reading.html#a-basic-inquiry-example <https://pdal.io/tutorial/reading.html#a-basic-inquiry-example> interesting.las) was the following

'PROJCS["NAD_1983_Oregon_Statewide_Lambert_Feet_Intl",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic_2SP"],PARAMETER["standard_parallel_1",43],PARAMETER["standard_parallel_2",45.5],PARAMETER["latitude_of_origin",41.75],PARAMETER["central_meridian",-120.5],PARAMETER["false_easting",400000],PARAMETER["false_northing",0],UNIT["foot",0.3048,AUTHORITY["EPSG","9002"]]]’

But using 2.1.0, this becomes the following

'PROJCS["NAD_1983_Oregon_Statewide_Lambert_Feet_Intl",GEOGCS["GCS_North_American_1983",DATUM["North_American_Datum_1983",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]]],PROJECTION["Lambert_Conformal_Conic_2SP"],PARAMETER["latitude_of_origin",41.75],PARAMETER["central_meridian",-120.5],PARAMETER["standard_parallel_1",43],PARAMETER["standard_parallel_2",45.5],PARAMETER["false_easting",400000],PARAMETER["false_northing",0],UNIT["foot",0.3048,AUTHORITY["EPSG","9002"]],AXIS["Easting",EAST],AXIS["Northing",NORTH]]’

I am lost on 2 topics
- How can a read operation change the data returned, is there some lookup being done (proj version causing this?)
- Are these 2 equivalent or what causes this to change and be different?

Very possibly i am missing some crucial background information on these spatial references, so feel free to point me to relevant documentation or changelogs.

Thanks in advance!

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