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Hi Peter, I'll start the ball on this with a short answer.CF datasets are self-describing. They do not reference a controlled vocabulary of coordinate reference systems external to the file. Thus a CF subset of a valid CF dataset is always another valid CF dataset and its geo-location is self-describing -- even if it has fewer dimensions than the parent file. The question you are asking does not really apply to CF datasets "in their native habitat".
Echoing your question back: CF 1.2 (??) added a section on "5.6. Grid Mappings and Projections Horizontal Coordinate Reference Systems", which is specifically to handle the associations between CF datasets and the corresponding crs. (http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/cf-conventions.html#grid-mappings-and-projections). Should this mapping be refined to address solutions to 4D (n-D) subsetting that you have developed in WCS?
- Steve ============================= Peter Baumann wrote:
Hi community,in the WCS group we are wondering how you deal with subsetting operations in n-D data spaces - obviously a result with less dimensions than the original cube needs to get a different CRS associated. How do you find the appropriate result CRS, for example, for a x/t cut from an x/y/z/t cube?thanks in advance for any bits of wisdom, Peter
-- Steve Hankin, NOAA/PMEL -- Steven.C.Hankin@xxxxxxxx 7600 Sand Point Way NE, Seattle, WA 98115-0070 ph. (206) 526-6080, FAX (206) 526-6744 "The only thing necessary for the triumph of evil is for good men to do nothing." -- Edmund Burke
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