[pdal] Modify the resolution

[Silvia Franceschi]

Hi Howard,
thanks for the useful information, I tried to follow your tutorial to
assign a CRS and some real world coordinates to my point cloud using these
parameters:
 "type":"writers.las",
            "a_srs": "EPSG:25832",
    "offset_x": "676686.38353",
    "offset_y": "5144012.94443",
            "filename":"output.las"

The program seems to work but if I then run an info, it seems that nothing
has changed.
Am I missing something?

Any suggestion is welcome! :-D

Silvia


On Thu, May 9, 2019 at 2:41 PM Howard Butler <howard at hobu.co> wrote:

>
>
> On May 9, 2019, at 7:25 AM, thejus kambi <thejus.kambi at gmail.com> wrote:
>
> Hello,
>
> Is there a way to modify the resolution of coordinates stored in the
> LAS/LAZ files. I find currently the file stores upto 2 decimal places. Is
> there a way to increase or decrease it?
>
>
> Thejus,
>
> You control these with the writers.las.scale_{x|y|z} options of
> writers.las https://pdal.io/stages/writers.las.html Additionally, if you
> are working exclusively with LAS data, you might also issue the
> --writers.las.forward=all option to carry forward all metadata, including
> scale/offset from a single file transformation.
>
> pdal translate in.las out.las --writers.las.scale_x=0.001
> --writers.las.scale_y=0.001 --writers.las.scale_z=0.001
> --writers.las.offset_x=auto --writers.las.offset_y=auto
> --writers.las.offset_z=auto
>
>
> pdal translate in.las out.las --writers.las.forward=all
>
>
> There are a couple of reasons why we do not default these options to
> always being set:
>
> * What are we to do if the translation includes multiple files at once?
> * Ambiguities that result from changing the LAS version
> * What are we to do in situations where multiple LAS files are being
> written?
>
> It is a surprise, but users have to be explicit about their LAS metadata
> settings with PDAL. Once they are, they should be able to achieve most
> everything they need.
>
> Additionally, I wrote a tutorial of these issues on the website at
> https://pdal.io/tutorial/las.html
>
> Hope this helps,
>
> Howard
>
>
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-- 
ing. Silvia Franceschi
Via Roma, 64
38030 Castello di Fiemme (TN)

tel: 0039 -3384501332
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