[gdal-dev] [OSGeo-Standards] Idea: GeoTIFF box in JPEG to addgeoreferencing

Tue May 20 03:00:18 PDT 2014

Peter, Carl et al
For the sake of clarification, I'd like to know in the " this includes GMLCOV and WCS." What does the "this" relates to ? (GMLJP2 ?, OGC/ISO discussion ? both ?
Moreover, I believe WCS is not directly related (or included) ... IMHO, the relationship between WCS (Web coverage Service) and these encodings (JPEG2000, JPEG, PNG) is only via the WCS encoding extensions (presently the GeoTIFF one, and the emergent JP2K one).

The version 2 of the OGC GML in JP2000 (GMLJP2) candidate is based on the GMLCOV schema.
My understanding of the OGC/ISO TC211 discussion is that it is related to the "Geo-enabled JP2K standard(s)", for which GMLJP2 is a candidate, being aware that there are others (such as the GeoTIFF box in JPEG2000 - also called GeoJ2(TM)).

Would there be additional discussion to bring GMLCOV to ISO TC211 (as an implementation standard for 19123) ?

Cheers
Emmanuel Devys

-----Message d'origine-----
De : gdal-dev-bounces at lists.osgeo.org [mailto:gdal-dev-bounces at lists.osgeo.org] De la part de Peter Baumann
Envoyé : mardi 20 mai 2014 09:27
À : Carl Reed; Even Rouault; gdal-dev at lists.osgeo.org
Cc : Jukka Rahkonen; standards at lists.osgeo.org
Objet : Re: [gdal-dev] [OSGeo-Standards] Idea: GeoTIFF box in JPEG to addgeoreferencing

On 05/19/2014 10:50 PM, Carl Reed wrote:
> Thanks, Peter.
>
> Also, FYI, version 2 of the OGC GML in JP2000 (GMLJP2) candidate 
> standard is in an OGC adoption vote until June 29.  There is also an 
> OGC/ISO discussion this week as to whether this OGC standards should also become an ISO standard.

Just for clarification: this includes GMLCOV and WCS.
cheers,
Peter

>
> Cheers
>
> Carl
>
>
> -----Original Message----- From: Peter Baumann
> Sent: Monday, May 12, 2014 3:39 PM
> To: Even Rouault ; gdal-dev at lists.osgeo.org
> Cc: Jukka Rahkonen ; standards at lists.osgeo.org
> Subject: Re: [OSGeo-Standards] [gdal-dev] Idea: GeoTIFF box in JPEG to 
> addgeoreferencing
>
> PS: not sure all on this list are aware of this overview page:
> http://external.opengeospatial.org/twiki_public/CoveragesDWG/Coverages
> BigPicture
>
> -Peter
>
>
> On 05/12/2014 11:38 PM, Peter Baumann wrote:
>> Hi all,
>>
>> just saw this, thought I'd chime in being the editor of GMLCOV :) Any 
>> questions, I'll gladly try to answer, I'm just on the road currently, 
>> so expect a delay of a day or so.
>>
>> Trying to respond to what has been raised below:
>>
>> On 05/12/2014 11:18 PM, Even Rouault wrote:
>>> Le lundi 12 mai 2014 23:05:21, Jukka Rahkonen a écrit :
>>>> Even Rouault <even.rouault <at> mines-paris.org> writes:
>>>>
>>>> ...
>>>>
>>>>>> In light of this, it may be better to use an xml or textual 
>>>>>> representation and embed it inside an XMP block, which is 
>>>>>> supported for many formats[1]. Also it would allow for easier human-reading.
>>>>> Yes, that's one possibility. Which comes back to GMLJP2 unless 
>>>>> there are
>>>> other
>>>>
>>>>> standards...
>>>>>
>>>>> I'd want to build on something that is a "real" standard or a 
>>>>> de-facto standard, but not reinvent everything from scratch.
>>>> What GMLJP2 gives as a bonus is the axis order trouble
>>
>> actually, no. GMLJP2 relies on GMLCOV which defines axis order. Each 
>> coverage has a Native CRS which is defined via an OGC URI (which, in 
>> the case of EPSG, refers to the OGP maintained database). In the CRS 
>> definition the axis is given unambiguously.
>>
>> If you don't want to go to that database, use the axisLabels 
>> attribute in the Envelope, it lists axes in their proper sequence.
>>
>>
>>>> and not totally
>>>> clear interpretation if origin is in the centre (probably it is) or 
>>>> in the corner of a pixel,
>>
>> naively, GMLCOV follows the pixel-in center interpretation. However, 
>> encodings may override this, such as GeoTIFF (see the pertaining 
>> adopted spec [1]).
>>
>> [1] https://portal.opengeospatial.org/files/?artifact_id=50118
>>
>>
>>>> and rectified grid does not support ground control points.
>>
>> yes, because it is rectified. If you want more degree of freedom do 
>> not use RectifiedGridCoverage but ReferenceableGridCoverage. In 
>> conjunction with GML
>> 3.3 ( a compatible enhancement of GML 3.2.1) this gives you irregular 
>> and warped grids. We're not completely done, though, and would be 
>> glad about your support in some advanced issues. Note that this work 
>> is all voluntary and relies on some project financing to be done. Up 
>> to now, EC and ESA have been generous, and so we are going ahead step by step.
>>
>>
>>>> Thus GMLJP2 is at least not better in everything, it has also 
>>>> drawbacks.
>>> Hi Jukka,
>>>
>>> Yes, for all your above reasons, I would prefer to avoid it.
>>
>> so which ones are remaining, following the clarification you mention below?
>>
>> cheers,
>> Peter
>>
>>> Although the axis order trouble (the one of EPSG) and interpretation 
>>> of origin (pixel center) should be mostly clarified with the revised version.
>>> As far as ground countrol points are concerned, I've not really 
>>> looked at the capabilities of GMLCov, so perhaps there's something in it for that.
>>> Otherwise, that would be indeed a drawback.
>>>
>>>> -Jukka Rahkonen-
>>>>
>>>> _______________________________________________
>>>> gdal-dev mailing list
>>>> gdal-dev at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>
>

--
Dr. Peter Baumann
  - Professor of Computer Science, Jacobs University Bremen
    www.faculty.jacobs-university.de/pbaumann
    mail: p.baumann at jacobs-university.de
    tel: +49-421-200-3178, fax: +49-421-200-493178
  - Executive Director, rasdaman GmbH Bremen (HRB 26793)
    www.rasdaman.com, mail: baumann at rasdaman.com
    tel: 0800-rasdaman, fax: 0800-rasdafax, mobile: +49-173-5837882 "Si forte in alienas manus oberraverit hec peregrina epistola incertis ventis dimissa, sed Deo commendata, precamur ut ei reddatur cui soli destinata, nec preripiat quisquam non sibi parata." (mail disclaimer, AD 1083)

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