[pdal] Attempting to filter out (1) Unclassified points flagged as Withheld

[Rose Phillips]

Hi pdal'ers

These are my attempts to filter out (1) Unclassified Points flagged as withheld in LAS filers for further analyses.
Any chance you guys can point to where I have gone wrong?

pipelines I have tried using pdal 2.3.0: to filter out (1) unclassified points flagged as withheld;

1.

{
    "pipeline" : [
    {
        "type" : "readers.las",
        "filename" : "input.las"
    },
                {
                                "type":"filters.range",
                                "limits":"Classification![129:129]"
                },
    {
        "type" : "writers.las",
        "a_srs" : "EPSG:2193+7839",
        "filesource_id" : "0",
        "filename" : "output.las"
    }
    ]
  }

2.
{
    "pipeline" : [
    {
        "type" : "readers.las",
        "filename" : "input.las"
    },
                {
                                "type":"filters.range",
                                "limits":"Classification![129:129]",
                                "where":"Classification!=129"
                },
    {
        "type" : "writers.las",
        "a_srs" : "EPSG:2193+7839",
        "filesource_id" : "0",
        "filename" : "output.las"
    }
    ]
  }

3.
pdal info --stats C:\Temp\scan_angle\test_file\CL2_BW24_2020_1000_4526.las --filters.range.limits=Classification![129:129] --filters.stats.dimensions=Classification --filters.stats.count=Classification

All my outputs have these points still intact in their files and the pdal info doesn't appear to support this filter.

Kindest regards
Rose Phillips
Elevation Data - Land Information New Zealand

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