[pdal] losing precision in PDAL pipeline

[thejus kambi]

Hello Karl,

By default the scale value used in PDAL is 0.01. So if you need higher
precision you may want to provide "scale_x", "scale_y" and "scale_z"
parameters in your input and output.

Warm Regards,
Thejus


On Thu, Aug 8, 2019 at 10:29 AM Karl North <karln at surdex.com> wrote:

> 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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