Thanks Jonathan, I was looking at the example rather than the real
spec, sorry. Can I clarify that I've understood the terms correctly?
> * grid_north_pole_latitude
> * grid_north_pole_longitude
These define the real-world location of the rotated grid's north pole
(i.e. +90 degrees).
> * north_pole_grid_longitude - This parameter is option (default is 0).
This defines the longitude of the rotated grid that passes through the
real-world north pole.
Is this right?
Thanks, Jon
On Thu, Jun 18, 2009 at 3:21 PM, Jonathan
Gregory<j.m.gregory at reading.ac.uk> wrote:
> Dear Jon
>
>> 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?
>
> Yes, the pole location itself is not enough. There are actually three CF
> attributes defined for this grid mapping.
>
> ? ?* grid_north_pole_latitude
> ? ?* grid_north_pole_longitude
> ? ?* north_pole_grid_longitude - This parameter is option (default is 0).
>
> The third one pins down the rotation of the new globe.
>
> Cheers
>
> Jonathan
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>
--
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
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Received on Thu Jun 18 2009 - 08:29:55 BST
