[pdal] Modify the resolution

[Andrew Bell]

If you don't want the defaults, you need need to specify values. See the
documentation for details about default values.

On Sat, May 11, 2019, 4:01 PM James Klassen <klassen.js at gmail.com> wrote:

> If you don't set Z, I believe it will use the defaults/automatically
> determined values for Z.
>
> Personally, if I like to set all 6 (x/y/z both offset and scale) if I set
> any of them.  It probably doesn't make any difference, but it seems like
> less room for surprises later.
>
> On Sat, May 11, 2019, 08:53 Silvia Franceschi <silvia.franceschi at gmail.com>
> wrote:
>
>> 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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