Hi Jon,
In our experience they are very useful coordinate variables. Allowing a
simple and quick lookup without having to perform any calculations. For
example, cdms allows you to say:
>>> print myvar.getLatitude()
52.45555555
If the data provider knows the lats and lons at write time it is far
easier to provide them than to expect all users to re-generate them.
It just simplifies usage.
Cheers,
Ag
-----Original Message-----
From: cf-metadata-bounces at cgd.ucar.edu
[mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Jon Blower
Sent: 17 June 2009 15:46
To: CF metadata
Cc: Adit Santokhee
Subject: [CF-metadata] Rotated-pole grids
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.htm
l#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
j.d.blower at reading.ac.uk
http://www.nerc-essc.ac.uk/People/Staff/Blower_J.htm
_______________________________________________
CF-metadata mailing list
CF-metadata at cgd.ucar.edu
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
--
Scanned by iCritical.
Received on Wed Jun 17 2009 - 09:02:19 BST
