[Requests] comment on SWE Common: reference OGC standards

Peter Baumann p.baumann at jacobs-university.de
Mon Mar 29 19:07:12 EDT 2010


PART A

1. Evaluator:
        Peter Baumann, p.baumann at jacobs-university.de

2. Submission:
    SWE Common Data Model 2.0 RFC (09-084) 
<http://portal.opengeospatial.org/files/?artifact_id=38475&version=2&format=pdf> 



PART B

1. Requirement:
    mention relevant OGC standards in addition to ISO, in particular:
    the Web Coverage Service when it comes to coverages

2. Implementation Specification Section number:
    Annex B, in particular: Section B.3, p 152

3. Criticality:
    major

4. Comments/justifications for changes:

Instead of only referring to ISO standards, SWE Common should also refer 
to relevant OGC standards (Abstract Topic 6 in addition to ISO 19123, etc).

This should be done already in the Introduction, but also in B.3 which 
currently says:
--- snip ----------------------
B.3 Coverage model
SWE "Arrays" can sometimes be interpreted as coverage range data or grid 
data. However, SWE data arrays are lower level data types and don't 
constitute a "Coverage" in themselves. The ISO "Coverage" model can be 
used on top of the SWE "Array" model (which only provides means for 
describing and encoding the data), in order to provide a stronger link 
between range data and domain definition.
Additionally, sensor descriptions given in SensorML (and thus using the 
SWE Common model) can be used to define a geo-referencing transformation 
that can be associated with a coverage via the ISO model.
--- snip ----------------------

This is correct, but somewhat misleading. Further, IMHO the 
corresponding OGC standards should go first (eg, Abstract Topic 6 
instead of ISO 19123 - I have been pointed to that earlier by OGC 
staff). A reference to WCS would be helpful for the reader's 
understanding, such as:
--- snip ----------------------
SWE "Arrays" can sometimes be interpreted as coverage range data or grid 
data. However, SWE data arrays are lower level data types and don't 
constitute a "Coverage" in themselves.
OGC Web Coverage Service (WCS) defines "Coverages" (both geo referenced 
and not referenced) from an OGC perspective, based on the GML 3.2.1 
coverage model and OGC Abstract Topic 6 (which is identical to ISO 19123).
--- snip ----------------------

-- 
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 147737)
   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 10xx)



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