At the risk of getting boring...
Section H.2.1 contains the sentence (emphasis added):
This has either a one-dimensional coordinate variable, time(time),
provided the time values are ordered monotonically, or a
one-dimensional auxiliary coordinate variable, time(o), where o is the
element dimension.
This seems to imply that it's possible for the time values *not* to be
ordered monotonically, which is counter to the definition of a time
series.
My understanding is you can have either time(time) or time(o), but in
both cases the values must be ordered monotonically. If that's the case
I suggest simply dropping the conditional clause from the sentence to
leave:
This has either a one-dimensional coordinate variable, time(time),
or a one-dimensional auxiliary coordinate variable, time(o), where o
is the element dimension.
In addition, we could add the following at the end of the paragraph:
In both cases, the time values must be ordered monotonically.
Thanks for your patience!
Richard Hattersley AVD Iris Technical Lead
Met Office FitzRoy Road Exeter Devon EX1 3PB United Kingdom
Tel: +44 (0)1392 885702 Fax: +44 (0)1392 885681
Email: richard.hattersley at metoffice.gov.uk Website:
www.metoffice.gov.uk
> -----Original Message-----
> From: cf-metadata-bounces at cgd.ucar.edu
> [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of
> Jonathan Gregory
> Sent: 10 May 2012 16:41
> To: cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] Reverse-time trajectory
>
> Dear Richard
>
> For timeseries I'd apply the same argument as before, that
> they already
> existed before sect 9 and weren't prohibited from having
> reversed time axes.
> By analogy it seems fine to me to allow reversed time in any case.
>
> Cheers
>
> Jonathan
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>
Received on Fri May 11 2012 - 08:45:06 BST
