[pdal] translating coordinated

[Andrew Bell]

On Mon, Sep 24, 2018 at 2:25 PM Matt Beckley <beckley at unavco.org> wrote:

> Hello,
>
> I have a las file that I am trying to work with using PDAL.  I am able to
> georeference the file using lastools with the "reoffset" and
> "translate_xyz" parameters:
>
> las2las.exe -i input.laz -reoffset 357200 4742000 2150 -translate_xyz
> 357200 4742000 2150 -o output.laz
>
> However, when I try to do this with PDAL, it doesn't seem to work.  I've
> tried variants on a pipeline of:
>
> {
>             "type" : "writers.las",
>             "offset_x":"357200",
>             "offset_y":"4742000",
>             "offset_z":"2150",
>     "scale_x":"0.001",
>     "scale_y":"0.001",
>     "scale_z":"0.001"
> }
>
> But the coordinates are never properly translated.  I've tried playing
> with the scale, but nothing works.  There doesn't seem to be a way to add a
> fixed offset to the coordinates?
>
> The file is in UTM 33N coordinates, so a valid coordinate would be
> 357200,4742000 - for example.   I tried a scale of 1, but that also didn't
> work.
>

Hi Matt,

You need to read the PDAL documentation.  PDAL isn't lastools.

You'll need to put a reprojection filter in between the reader and the LAS
writer order to facilitate reprojection.  See:

https://pdal.io/stages/filters.reprojection.html

-- 
Andrew Bell
andrew.bell.ia at gmail.com
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