[pdal] Modify the resolution

[Silvia Franceschi]

Ok, I was just trying to do this...
just an additional question: do I have to specify also offset_z and scale_z
even if  I don't want to change z values?
So I will put
offset_z 0
scale_z 1

Thanks!

Silvia


On Sat, May 11, 2019 at 3:47 PM James Klassen <klassen.js at gmail.com> wrote:

> 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
>>>
>>>
>>> _______________________________________________
>>> pdal mailing list
>>> pdal at lists.osgeo.org
>>> https://lists.osgeo.org/mailman/listinfo/pdal
>>
>>
>>
>> --
>> ing. Silvia Franceschi
>> Via Roma, 64
>> 38030 Castello di Fiemme (TN)
>>
>> tel: 0039 -3384501332
>> _______________________________________________
>> pdal mailing list
>> pdal at lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/pdal
>
>

-- 
ing. Silvia Franceschi
Via Roma, 64
38030 Castello di Fiemme (TN)

tel: 0039 -3384501332
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