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Jan 23, 2008 WCS.SWG Galeon Session
Version 6, changed by BenDomenico. 01/24/2008. Show version history
GALEON Session in WCS.SWG Telecon of January 23, 2008
Notes of Ben Domenico
<<Yesterday, we had our first "GALEON session" in the weekly WCS.SWG (WCS Standards Working Group formerly known as the WCS.RWG, Revision Working Group). Unfortunately I did not take very good notes, but I'll attempt to provide a list of the few highlights and ask other GALEONites who participated to add to or correct my summary.>>
Ben started the session with an overview of the issues and ideas that arose during and after the Unidata OGC Interoperability Day during the Boulder OGC TC meetings. This was mainly a recapitulation of first part of the summary at:
Primary Issues at Unidata OGC Interoperability Day in September in Boulder
- Few implementations of WCS 1.1 and CS-W 1.0 to test for interoperability
- General, all-encompassing specifications become too complicated for specific data categories
- WCS 1.2 direction substantially different from WCS 1.1
- OGC specifications tending toward "core" and "extensions" approach, e.g.
- WCS 1.2
- GML
- Architecture Board discussions
- Need for more focus on practical implementation and testing
- GALEON CF-netCDF realm needs
- a more general data model
- simpler interface specification with extension profiles for specific categories
Possible WCS Implementation and Experimentation Process
- Start with existing WCS 1.0 implementation
- Find limitations via interoperability experimentation
- Augment specs AND implementations to address limitations
- Feed results of implementation and experimentation into RWG
Ben emphasized that considerable work is needed within the CF-netCDF community on expanded sets of CF conventions to encompass data types other than grids (e.g., points, station obs, profiles, trajectories, radar radials, swaths, irregular mesh grids, etc.), mapping those to the ISO 19123 coverage models and carefully and explicitly dealing with Coordinate Reference Systems. That will put us in a position to propose these as coverage "application profiles" for binary encoding.
Other Possible GALEON Connections
Arliss noted that Doug O'Brien from Canada discussed some similar issues and data types and the December OGC TC meeting -- at which GALEON unfortunately had a thin representation. It will be important to follow up with Doug.
Another area where GALEON input would be valuable is in use cases for WCS 1.1 and 1.2 -- both commenting on the existing use cases and adding GALEON-specific use cases where appropriate.
GALEON participants are encouraged to join the WCS.SWG as observers and Stefano Nativi and Andrew Woolf are already charter members of the group from their earlier membership in the WCS.RWG for 1.1. To sign up for the WCS 1.2 SWG, please go to
on the OGC members portal.
There was some discussion of attempts at harmonization between SWE (Sensor Web Enablement) which began at the Paris meeting and continued with a special session at the Boulder meeting. This is important for GALEON in that, if we succeed in developing CF-netCDF coverage application profiles for our various data types, the SWE Sensor Observation Service (SOS) may be a valid alternative delivery mechanism. Since coverages are a special form of feature in the ISO world, WFS (Web Feature Service) may be another option.
Draft WCS Application Profiles
At present there are two draft application profiles for WCS: JPEG200 and JPIP.
These may be useful as models that will facilitate the completion of the CF-netCDF application profile that was drafted late last year and discussed with John Evans but never finalized. It is crucial that we complete this profile for CF-netCDF gridded datasets. Such application profiles should be submitted as change requests for draft extension.
Next GALEON Session in WCS.SWG Telecon
It was agreed that we'd have such GALEON sessions at the WCS.SWG telecon every 4 weeks. The next one is tentatively scheduled for February 20.
