[OSGeo-Standards] What's GMLCOV and GMLCOV for JPEG2000?

Joan Masó joanma747 at gmail.com
Thu Jul 24 09:21:41 PDT 2014

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 [1]; 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 [2] 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.
> HTH,
> Peter
> [1] http://en.wikipedia.org/wiki/Coverage_data
> [2] 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?
>> --Stefan
>> 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
>>> encodings.
>>> Best regards,
>>> --
>>> Mateusz  Łoskot, http://mateusz.loskot.net
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> --
> 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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