On 8/3/2011 8:19 AM, Jon Blower wrote:
Hi all,
I've been following this thread with great interest. For me it boils down to
this question:
- Is the datum always known by the data provider?
If the answer is "yes" then I see no reason to omit the datum (and plenty of
reasons to include it). If there *are* situations where the datum is genuinely unknown
or undefined then we need to express this clearly too so users can beware.
(Previous posts mentioned GCMs as possible situations where the datum is
unknown - is this really true? Surely there is always a sphere with a known
radius on which coordinates are based?)
Cheers,
Jon
--
Dr Jon Blower
Technical Director, Reading e-Science Centre
Environmental Systems Science Centre
University of Reading, UK
Tel: +44 (0)118 378 5213
http://www.resc.reading.ac.uk
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Just to add to the above, there are 2 issues we are discussing:
1) possible recommendations by CF to always include the datum, and
making sure we have the right metadata to do so.
2) possible recommendations by CF as to what to do if the datum is not
present, or is only partially specified.
John
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