Hi Roy:
Thanks for clarifying. I was thinking of the "internet profile" at
http://tools.ietf.org/html/rfc3339
John
On 10/20/2010 7:40 AM, Lowry, Roy K wrote:
> Hi John,
>
> ISO-8601 allows timestamps to any resolution from year to millisecond, so 2010, 2010-10, 2010-10-20 are all valid so the string can be any length from 4 to 27
> (e.g. 2010-10-20T14:53:00.000Z-15), unless restricted through an 8601 profile (as many communities do)
>
> Cheers, Roy.
>
>
>
> -----Original Message-----
> From: cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of John Caron
> Sent: 20 October 2010 13:36
> To: cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] New standard names for satellite obs data
>
> On 10/19/2010 12:55 PM, Mike Grant wrote:
>> On 19/10/10 14:21, Aleksandar Jelenak wrote:
>>> Actually, I don't think it is possible to use 'time' standard name in
>>> such cases. If I correctly interpret CF rules for using standard names,
>>> 'time' data can be only in the physically-equivalent units to "seconds".
>>> Strings, being dimensionless, do not qualify.
>>
>> Out of curiosity, why do you want to store time as strings? It's easy
>> to create those strings from numerical values, and numerical values are
>> easier to handle in code (and in netcdf-3, as Seth said).
>>
>> Cheers,
>>
>> Mike.
>
> I made a proposal a few years ago to allow ISO-8601 time strings to be an allowable form of time coordinates, which was not accepted. I would be interested to hear what your reasons are to use this form vs udunits (eg "secs since reference")? ISO-8601 time strings are fixed length (21 I think?) so handling in netcdf-3 is not so hard.
>
> Your proposal would amount to standardizing how to include ISO-8601 time strings, but the standard udunits time coordinate would still be required.
>
> Clarification of your purpose might clarify the name. At first glance, I might prefer "time_iso8601" over "time_label_iso8601".
>
> John
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Received on Wed Oct 20 2010 - 08:13:52 BST
