Dear all, Looking again at the CF specification for a rotated-pole grid, it seems to be underspecified. There are an infinite number of coordinate systems for a given pole location because the "new globe" can be rotated about its axis - don't we need some more information?
So perhaps the lon and lat arrays are not redundant after all... ;-) Cheers, Jon On Wed, Jun 17, 2009 at 3:45 PM, Jon Blower<[email protected]> wrote: > Dear all, > > We have some data that use a rotated pole grid. The CF convention for > describing this is here: > http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/cf-conventions.html#id2985006. > Are the 2D lon and lat variables in this example really necessary? > They would seem to be redundant as their values can be calculated from > rlon, rlat and the location of the new "north" pole. > > Thanks, Jon > > -- > Dr Jon Blower > Technical Director, Reading e-Science Centre > Environmental Systems Science Centre > University of Reading > Harry Pitt Building, 3 Earley Gate > Reading RG6 6AL. UK > Tel: +44 (0)118 378 5213 > Fax: +44 (0)118 378 6413 > [email protected] > http://www.nerc-essc.ac.uk/People/Staff/Blower_J.htm > -- Dr Jon Blower Technical Director, Reading e-Science Centre Environmental Systems Science Centre University of Reading Harry Pitt Building, 3 Earley Gate Reading RG6 6AL. UK Tel: +44 (0)118 378 5213 Fax: +44 (0)118 378 6413 [email protected] http://www.nerc-essc.ac.uk/People/Staff/Blower_J.htm _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
