Dear Jonathan They are DEM corrected geodetic latitude, longitude, and altitude spatial co-ordinates as 2D arrays (n_pixels within swatch x n_lines in product) and measurement time as a 1D array (n_lines). So despite the naming the spatial co-ordinates are not Unidata ... and I assume will have to be renamed.
The reason I asked is that I noted the discussion (swatch observational data >> multiple file datasets) last year but on re-reading the was uncertain whether this was work in progress or to be included when the next version of the convention is released. >From your, V.Balaji's and John Caron's response I guess that this is still >under discussion. Many thanks for your help. I will follow up on the suggestions. Kind Regards Steve -- Dr Stephen Emsley T: +44 (0)1752 764 289 ARGANS Limited M: +44 (0)7912 515 418 -----Original Message----- From: Jonathan Gregory [mailto:[email protected]] On Behalf Of Jonathan Gregory Sent: 28 April 2010 15:44 To: Stephen Emsley Cc: [email protected] Subject: Re: [CF-metadata] Separating geolocation/timing co-ordinates from measurement data Dear Steve > We have multiple satellite geophysical data products which share the > same set of geo-location and timing co-ordinates. To avoid product > bloat (e.g. from approx. 30GB to 90GB per orbit) we are considering > the possibility of having a single file storing the co-ordinates but > we think that this conflicts with our desire to be CF Convention > conformant. Is that correct? It is technically non-conformant but it has already been done in other applications, including CMIP5 in some respects. I think we need a convention for this, but we have not agreed one. My suggestion is that it should be OK to give the name of the coordinate variables in the file where they reside. Software will have to regard several files as one dataset, in which case it would be able to find the coordinate variables by name. Are they 1D (Unidata) coordinate variables, or auxiliary coordinate variable (named by the CF coordinates attr) that you want to omit? Best wishes Jonathan _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
