John -
> 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.
yes I think that's right. Personally I'm not in favour of a default datum - if the datum is unknown this should be expressed clearly.
Jon
-----Original Message-----
From: cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of John Caron
Sent: 03 August 2011 15:28
To: cf-metadata at cgd.ucar.edu
Subject: Re: [CF-metadata] the need to store lat/lon coordinates in a CF-compliant netCDF file
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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> CF-metadata at cgd.ucar.edu
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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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Received on Wed Aug 03 2011 - 08:30:20 BST
