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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Benno Blumenthal wrote: > John Caron wrote: > >> Much harder question is the distinction between a dataset and a >> collection, >> since a dataset is a collection of data. I have conceptualized it as >> >> follows: a dataset is something that can be selected, and then it is >> >> processed in a protocol-dependent way. A collection is a >> protocol-independent mechanism for grouping datasets. > > I think this is what is getting us into trouble. The concept of a > dataset should be independent of the services available for it: a > dataset served from two different servers could very well have > different services/protocols available, depending on the server. (the > aggregation server converts collections to datasets, for example). > Yet from the THREDDS/educational point of view, it is the same object. > > I agree with this as well. I've been trying to reconcile how a catalog might look for a particular multifile 'dataset' which has both WMS and DODS access available for it. For WMS (for multifile) datasets the access point would be at the collection level, while for 'non-aggregated' datasets the DODS access would be lower than the collection level, at the THREDDS dataset level. It seems that the concept of a dataset resides more at the collection level, maybe the service access binding is too tightly coupled to the dataset concept in the current draft. Dan > > Benno > > > -- > Dr. M. Benno Blumenthal benno@xxxxxxxxxxxxxxxx > International Research Institute for climate prediction > Lamont-Doherty Earth Observatory of Columbia University > Palisades NY 10964-8000 (845) 680-4450 > >
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