[pdal] losing precision in PDAL pipeline

[Karl North]

Good morning once again PDAL'ers.  It's a new day, and a new issue...

I'm running a multi-step process using several executions of "pdal translate" and at the end assembling the various parts ( multiple LAS files ) from these executions into a final point cloud ( LAS file ) for delivery.  All of the "pdal translate" commands include the string : --writers.las.forward="all" in order to preserve the precision of the source data.

My problem is that at the final step where I use "pdal pipeline" to merge the various parts, my file precision gets truncated from 0.001 to 0.01 units.

Below is a simple minimalist sample JSON file that I am running through "pdal pipeline" to do the merge operation.  I have checked and all the input LAS files have 0.001 precision but the output LAS has only 0.01 precision.  I expected the forward=all line to preserve scales and offsets.

Please help.  What am I missing?

{
    "pipeline":[
        {
            "type":"readers.las",
            "tag":"WT_4447_596_step01b",
            "filename":"WT_4447_596_step01b.las"
        },
        {
            "type":"readers.las",
            "tag":"WT_4447_596_step02",
            "filename":"WT_4447_596_step02.las"
        },
        {
            "type":"writers.las",
            "inputs":["WT_4447_596_step01b","WT_4447_596_step02"],
            "forward":"all",
            "filename":"WT_4447_596_step03.las"
        }
    ]
}

Karl

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