[pdal] Modify the resolution

[James Klassen]

You need to set scale_x, scale_y, and scale_z

On Sat, May 11, 2019, 08:27 Silvia Franceschi <silvia.franceschi at gmail.com>
wrote:

> 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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