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

[Carl Reed]

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.

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
    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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