[postgis-users] pointcloud : change pcid ?

[Rémi Cura]

Yep.
For the downgrading I tried it a while ago for a subset of the same schema,
https://github.com/Remi-C/pointcloud/blob/master/lib/pc_api.h#L445

The idea was that usually we don't need all dimensions, particularly when
working on the geometry.
So I wrote a couple of functions to allow a pc_explodes with only a subset
of dimensions.

The condition was the dimension should have the same name.

I guess non mapped dimensions could be filled with O or null or Nan?

Cheers,
Rémi-C

2014-10-31 1:04 GMT+01:00 Paul Ramsey <pramsey at cleverelephant.ca>:

> Correct, I was thinking more PC_Transform(pcpatch, pcid), which would look
> for common dimension names and map between them by default, or could maybe
> accept a mapping (dim->dim) to control the conversion. But yes. Danger I
> suppose in downgrading data (pushing a 4 byte into 2 byte) but that could
> be left to users to avoid or not on their own (emit warnings on downgrades
> maybe).
>
> On Wed, Oct 29, 2014 at 4:54 AM, Rémi Cura <remi.cura at gmail.com> wrote:
>
>> I'm sorry I think I was unclear.
>> I don't want to acces point,
>> I just want to change the pcid of a patch.
>> For the moment it seems to imply a complete destruction/reconstruction of
>> a new,
>> which is really really not efficient.
>>
>> Basically in this case I would like a function PC_SetPCID(pcpatch)
>> I understand that such function is very hard to create in the genral
>> case, because you would have to put mappings between attributes.
>>
>>
>> Cheers.
>> Rémi-C
>>
>>
>>
>>
>> 2014-10-28 19:08 GMT+01:00 Stephen V. Mather <svm at clevelandmetroparks.com
>> >:
>>
>>  ​Ah. Yes, I think if you are accessing a point within a patch, you have
>>> to unpack the patch. It's one of those tradeoffs...
>>>
>>>
>>>    [image: http://sig.cmparks.net/cmp-ms-90x122.png] Stephen V. Mather
>>> GIS Manager
>>> (216) 635-3243 (Work)
>>> clevelandmetroparks.com <http://www.clemetparks.com>
>>>
>>>
>>>
>>>
>>>     ------------------------------
>>> *From:* postgis-users-bounces at lists.osgeo.org <
>>> postgis-users-bounces at lists.osgeo.org> on behalf of Rémi Cura <
>>> remi.cura at gmail.com>
>>> *Sent:* Tuesday, October 28, 2014 1:33 PM
>>> *To:* PostGIS Users Discussion
>>> *Subject:* Re: [postgis-users] pointcloud : change pcid ?
>>>
>>>  Now the only solution I found is to break a patch into point, then
>>> break point into attributes,
>>> then construct a  new point with correct pcid and attributes, then
>>> construct a new patch !
>>> Cheers,
>>> Rémi-C
>>>
>>> 2014-10-28 17:31 GMT+01:00 Stephen V. Mather <
>>> svm at clevelandmetroparks.com>:
>>>
>>>>  How do you mean? What are you doing now?
>>>>
>>>>
>>>>    [image: http://sig.cmparks.net/cmp-ms-90x122.png] Stephen V. Mather
>>>> GIS Manager
>>>> (216) 635-3243 (Work)
>>>> clevelandmetroparks.com <http://www.clemetparks.com>
>>>>
>>>>
>>>>
>>>>
>>>>     ------------------------------
>>>> *From:* postgis-users-bounces at lists.osgeo.org <
>>>> postgis-users-bounces at lists.osgeo.org> on behalf of Rémi Cura <
>>>> remi.cura at gmail.com>
>>>> *Sent:* Tuesday, October 28, 2014 11:01 AM
>>>> *To:* PostGIS Users Discussion
>>>> *Subject:* [postgis-users] pointcloud : change pcid ?
>>>>
>>>>    Hey,
>>>>  any pointcloud users has an idea about changing the pcid of a patch
>>>> without breaking it into pieces?
>>>>  Cheers,
>>>> Rémi-C
>>>>
>>>> _______________________________________________
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