On 28/09/12 12:40, Martin Raspaud wrote: > Within this context, we would like to associate a palette of (rgb) .. > However, I can't find information on how to do this in netcdf and more > particularly within CF.
This is really a presentation issue and, as such, I don't think it's been addressed within CF, which is more about describing the data. Similarly, the netcdf format is about containing and describing data, rather than pictures, which would be considered as a rendering of the data by a separate program. So I don't think you'll find anything dealing with it in CF or netcdf docs at present. Mark's question regarding the encoding of your data is very relevant - are your data values already crunched down to a 0-255 range suitable for palettising (in which case make sure you include the descaling parameters! [1]) or are they real data of some kind? The only other things I'd add to Mark's suggestions are that you might want to use the "ancillary_variables" attribute [2] to link to the "recommended" palette, and to consider the CF cell boundaries [3] as one way of encoding ranges (this might not make sense!) Cheers, Mike. [1] http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/ch08.html#packed-data [2] http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/ch03s04.html [3] http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/ch07.html -- PGP: 0xD4925D35 (5A17 756C 3F78 27DB C641 F50C 05EC 4F23 D492 5D35) *********************************************************************** Plymouth Marine Laboratory, Prospect Place, Plymouth, UK. PL4 9PN. PML is a company limited by guarantee and a registered charity. Registered England & Wales company no: 4178503; charity no: 1091222 http://www.pml.ac.uk/ This email is confidential and for the intended recipient(s) only. Terms and legal disclaimers apply: http://rsg.pml.ac.uk/email.html *********************************************************************** _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
