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Draft by Ben Domenico last updated: February 11, 2006
Glenn Rutledge of the US NCDC and Joe Bremen and Dan Zimble of ESRI had not participated actively in GALEON telecons previously but they represent organizations that are considering experimenting with GALEON netCDF server and client systems respectively.
George Percival outlined what has to be done in terms of wrapping up what has become Phase 1 of GALEON. Mainly a final summary report for phase 1 should be ready for distribution. This would include a summary of the work done, conclusions reached and a description of where GALEON is heading from here. One complication is that, if the intention is to get the report in for official recognition by the Huntsville Technical Committee meeting in March, we have to submit it by Monday, February 13. However, since this is not a formal interface specification recommendation, the rules can be suspended if the draft report is not posted till later in the week. Also, we should keep in mind that the initial posting is essentially to solicit comments and that changes based on those comments can be incorporated into the final document.
It was noted that, based on GALEON experiences, Peter Baumann has already posted formal recommendations for changes to the WCS 1.1 specification. However, it is clear that it will be difficult to get formal documents in for the ncML-GML ( the U of Florence and Unidata) application schema specification in time to meet the Feb 13 deadline. The CSML work at NERC will definitely be an item for GALEON Phase 2. Discussion of a recommendation for how to proceed on the question of netCDF as one of the WCS encoding formats was left to later in the teleconference.
While the first phase of GALEON has been quite productive, it is clear that much of the most challenging work is just beginning. Moreover, several new participants are getting actively involved and others are planning to. Two options are available. One is to establish a GALEON OGC Network and the second is to continue GALEON with a Phase 2 Interoperability Experiment (IE). The IE approach involves all the careful protections for intellectual property of the participants whereas the net OGC Network construct provides a workspace where participants (not necessarily OGC members) can work with client and server implementations. OWS 3 is being continued as a network and a new GEOSS Network is spinning up. It may well be valuable to continue GALEON as both a phase 2 IE (where we would continue the work on specifications such as the revisions posed by Peter Baumer as well as ncML-GML and CSML) and also as a new OGC Network (where we would continue the valuable experimentation with running client and server code with real datasets on distributed WCS server sites). The Network approach would also foster the development of "scenarios" for use of the client and server systems.
These options will be a topic for discussion at the Huntsville TC meeting.
The issue of coverages for point data came up. Stefan Falke indicated that he would take on that question and could give a brief summary at the March TC meeting.
A recommendation was made to consider the OWS-Context IE summary document as a model for the GALEON Phase 1 summary report. The OWS-Context IE document is apparently concise and similar in content to what whe need for Phase 1 summary.
Glenn Rutledge brought up the issue of the importance of SOAP/WSDL approaches to web services. Lorenzo Bigagli pointed out that this has already come up as a formal recommendation for a revision to the WCS spec. He will put a note about this on the GALEON Wiki
http://galeon-wcs.jot.com/WikiHome
A key issue facing GALEON is how to ensure that netCDF becomes an "official" WCS encoding format. At the Bonn TC meeting, an alternative approach to the current list of 5 "blessed" formats was discussed. The new approach would essentially do away with the fixed list in the WCS spec and require that "profiles" be generated for encoding formats. To help gain a sense of how the new approach would work, some GALEON participants are working on a draft document describing the use of netCDF as an encoding format.
http://www.unidata.ucar.edu/projects/THREDDS/GALEON/WCSnetCDFencoding.htm
The other approach is simply to propose adding netCDF as a sixth encoding format in the WCS specification. A draft of such a revision request has been attached to the Wiki Implementation Progress Page.
http://galeon-wcs.jot.com/WikiHome/Implementation%20Progress%20Page
The approach agreed upon in the teleconference is that we'd propose adding the netCDF as a 6th official encoding format immediately and work on the netCDF profile as part of GALEON Phase 2.
At the Huntsville TC meeting, GALEON will have about an hour on the agenda as part of the Coverages Working Group session. Topics to be addressed include:
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