RE: Issue 27: correction of the description of the Coverage in Linked Data deliverable

Ø  OGC's Coverage Implementation Schema (CIS, formerly GML 3.2.1 Application Schema - Coverages, GMLCOV) is interoperable indeed, and maps to standard formats, such as GML, GeoTIFF, and NetCDF.

Sorry to be persnickety, but I don’t understand this.

The abstract model in ISO 19123 provides the structures for mapping from any coverage implementation to any other.

The GMLCOV and its proposed successor the OGC Coverage Implementation Schema provides a concrete implementation of a significant subset of coverages used in practice, but not all (e.g. WaterML2, TimeseriesML). And I can’t see the SDWWG recommending to drop netCDF, GeoTIFF, WaterML2, TimeseriesML in favour of CIS (it fails the laugh test). So what status do you propose for CIS in the context of SDWWG?

Simon

From: Peter Baumann [mailto:p.baumann@jacobs-university.de]
Sent: Saturday, 10 October 2015 5:07 AM
To: Frans Knibbe <frans.knibbe@geodan.nl>; SDW WG Public List <public-sdw-wg@w3.org>
Subject: Re: Issue 27: correction of the description of the Coverage in Linked Data deliverable

Frans-

yes, you are exactly right.
Phrasing proposal:
"ISO 19123 defines an abstract coverage model whose implementations are not guaranteed to be interoperable (actually, various implementations expressly based on ISO 19213 exist which in fact are not interoperable, as has been shown by OGC surveys). OGC's Coverage Implementation Schema (CIS, formerly GML 3.2.1 Application Schema - Coverages, GMLCOV) is interoperable indeed, and maps to standard formats, such as GML, GeoTIFF, and NetCDF. CIS 1.1 is planned by ISO TC211 to become ISO 19123-2, as the concrete counterpart to abstract 19123, which will be renamed to 19123-1 (resolved by TC211 WG 6 in June 2015). Therefore, the coverage schema adopted by SWD WG should be compatible with forthcoming ISO 19123-2 aka OGC CIS 1.1."

HTH,
Peter

On 2015-10-09 14:28, Frans Knibbe wrote:
Issue 27<http://www.w3.org/2015/spatial/track/issues/27> is a special one, because it is about one of the deliverables. The Coverage in Linked Data deliverable<http://www.w3.org/2015/spatial/charter#cov> reads "The WG will develop a formal Recommendation for expressing discrete coverage data conformant to the ISO 19123 abstract model. ..."

Peter explained that this statement probably requires some adjustment, see this message<https://lists.w3.org/Archives/Public/public-sdw-wg/2015Apr/0024.html>, otherwise the deliverable will not have the proper foundation.

Do I understand correctly that is is a matter of saying that the Recommendation will not be based on ISO-19123, but on ISO-19123-2 (the soon to be published ISO version of the OGC Coverage Implementation Schema 1.1)?

We can not change the charter text, but we could add a clarification (a note) in the chapter about deliverables in the UCR document (Ed, Kerry or Phil: is that correct?).

If the assumption above are correct, could someone suggest a good wording for the note that should be added?

Regards,
Frans



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