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
