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

Peter Baumann p.baumann at jacobs-university.de
Tue May 20 00:26:54 PDT 2014

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
> 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/CoveragesBigPicture
> -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
    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
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