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Tom,thanks a lot for this contribution! It is one of my concerns that format metadata essential for understanding the file as such should not be stored elsewhere. The GML coverage model does allow that, and I very much want to at least brand this as "not recommended", better: disallow it, in a "GML WCS profile" or whatever it will be called.
Please make sure this your experience is well heard in our future discussions!
-Peter Tom Whittaker wrote:
I may be ignorant about these issues, so please forgive me if I am completely out-of-line....but when I looked at the examples, I got very concerned since the metadata needed to interpret the data values in the "data files" is apparently not actually in the file, but somewhere else. We've been here before: One of the single biggest mistakes that the meteorological community made in defining a distribution format for realtime, streaming data was BUFR -- because the "tables" needed to interpret the contents of the files are somewhere else....and sometimes, end users cannot find them! NetCDF and ncML maintain the essential metadata within the files: types, units, coordinates -- and I strongly urge you (or whomever) not to make the "BUFR mistake" again -- put the metadata into the files! Do not require the end user to have to have an internet connection to simply "read" the data....many people download the files and then "take them along" when traveling, for example. If I simply downloaded the file at <http://schemas.opengis.net/om/1.0.0/examples/weatherObservation.xml> I would not be able to read it. In fact, it looks like even if I also got the "metadata" file at: <http://schemas.opengis.net/om/1.0.0/examples/weatherRecord1.xml> I would still not be able to read it, since it also refers to other servers in the universe to obtain essential metadata. That is my 2 cents worth....and I hope I am wrong about what I saw in the examples.... tom
-- Dr. Peter Baumann - Professor of Computer Science, Jacobs University Bremen www.faculty.jacobs-university.de/pbaumann mail: p.baumann@xxxxxxxxxxxxxxxxxxxx tel: +49-421-200-3178, fax: +49-421-200-493178 - Executive Director, rasdaman GmbH Bremen (HRB 147737) www.rasdaman.com, mail: baumann@xxxxxxxxxxxx tel: 0800-rasdaman, fax: 0800-rasdafax, mobile: +49-173-5837882 "A brilliant idea is a job halfdone."
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