[OSGeo-Standards] What's GMLCOV and GMLCOV for JPEG2000?
mateusz at loskot.net
Thu Jul 24 15:07:10 PDT 2014
Joan, thanks for the very informative explanation.
On Jul 24, 2014 6:21 PM, "Joan Masó" <joanma747 at gmail.com> wrote:
> Let me try to add some more details the answer a little bit:
> All this "complexity" comes from the advantages of the modular
> specification that OGC is in using. The thing seem even more complicated if
> the standards are published for comments in revers order. Sorry about it.
> The idea is the following:
> * GMLCOV is a data model (as previously said) for coverages (e.g it is
> used in WCS 2.0) and has been around for more that 2-3 years.
> * GMLCOV is abstract and can be applied to any GML or non-GML format if
> you know how.
> * GMLCOV for JPEG2000 tells you how to match the concepts in GMLCOV with
> the concepts that already exists in JPEG2000. In the end you have a small
> GML document that describes a JPEG2000 file.
> * Now, how and where to use a GMLCOV for JPEG2000?:
> * You can use the XML embedding mechanism that JPEG2000 has and embed
> it inside the JPEG2000. GMLJP2 v2.0 tells you how to do it.
> * You can use it in combination with WCS 2.0. We can guess how to do it
> or we can wait that WCS standards working group releases another standard
> talking about this. WCS.SWG is planning to do it but I can not give you a
> There is a UML diagram in the specification that tries to explain all this
> relations. I'm not saying it is clear but now that all this has been said
> it might help.
> In the past there was a GMLJP2 v1.0 that used something similar to GMLCOV
> but different so from WCS.SWG we worked to harmonize GMLJP2 with GMLCOV and
> GMLCOV for JPEG2000 is the result.
> I hope this helps,
> Joan Masó
> On Thu, Jul 24, 2014 at 3:12 PM, Peter Baumann <
> p.baumann at jacobs-university.de> wrote:
>> Hi all,
>> GMLCOV is OGC's data model for coverages ; this is an interoperable,
>> conformance-testable implementation model for the abstract (hence,
>> non-interoperable) ISO 19123. It is good for n-D spatio-temporal regular &
>> irregular grids, point clouds, and meshes.
>> While formally defined in GML, GMLCOV does not depend on GML encoding. As
>> Mateusz has pointed out correctly, many encodings are possible, such as
>> JPEG2000. This figure  explains encoding variants. GMLJP2 adds GML info
>> to JPEG2000. As JPEG2000 can carry further information, this is used to add
>> in more (sub) coverages and features around the central grid image. For
>> example, annotations can be added into a GMLJP2 image this way.
>>  http://en.wikipedia.org/wiki/Coverage_data
>>  http://en.wikipedia.org/wiki/File:Coverage_encoding_variants.png
>> On 07/24/2014 02:39 PM, Stefan Keller wrote:
>>> Hi Mateusz
>>> Thanks a lot for the quick response.
>>> So put in other words:
>>> It's about a geospatial coverage format
>>> * under the hood of JPEG
>>> * with a OGC GEOCONV-alike metadata encoding
>>> * and a JPEG-alike regular raster/regular grid data encoding?
>>> 2014-07-24 14:22 GMT+02:00 Mateusz Łoskot <mateusz at loskot.net>:
>>>> On 24 July 2014 13:41, Stefan Keller <sfkeller at gmail.com> wrote:
>>>>> * What is roughly GMLCOV and GMLCOV for JPEG2000?
>>>> GMLCOV is the overall of OGC GML Coverage encodings.
>>>> GMLCOV for JPEG2000 is a proposal to extend the GMLCOV
>>>> with yet another non-GML encoding format of a geospatial coverage,
>>>> that is, JPEG2000.
>>>> The idea is similar to GMLCOV extensions for GeoTIFF, NetCDF and other
>>>> Best regards,
>>>> Mateusz Łoskot, http://mateusz.loskot.net
>>> Standards mailing list
>>> Standards at lists.osgeo.org
>> 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
>> "Si forte in alienas manus oberraverit hec peregrina epistola incertis
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