[CF-metadata] question and time and standard_name...

[CJ Beegle-Krause]

Hi John,

Defining terms should be sufficient; terminology is not consistent from 
my experience. At some point people my want to extend the basic 
terminology.  Here is a start:

hindcast - re-creation of past fields using collected observations in 
boundary conditions
nowcast - short time-period prediction of near-real-time fields using 
real-time data
forecast - prediction of future fields beyond influence of real-time data

-CJ

John Caron wrote:

> Hi CJ:
>
> At the moment, the nj22 library needs to identify the 
> forecast_reference_time and time coordinates. At the higher "Grid 
> Datatype" layer, we calculate "forecast offsets" (time - reference), 
> in which case hindcasts have negetive offsets, nowcasts have offset 0, 
> and forecasts have positive offsets. In this sense, the only thing we 
> really need from CF metadata is forecast_reference_time and time. Do 
> you think it would be sufficient to annotate the spec to clarify the 
> meaning of hindcast, nowcast and forecast times?
>
> CJ Beegle-Krause wrote:
>
>> There is a need to distinguish whole or parts of model runs, for 
>> example hindcast, nowcast and forecast could be sections of the same 
>> individual model run.  It would also be good to agree on what each of 
>> those terms could mean.
>>
>> John Caron wrote:
>>
>>> another one is "forecast_reference_time", the base time a model run 
>>> was made from.
>>>
>>> Ed Hartnett wrote:
>>>
>>>> Howdy all!
>>>>
>>>> The CF document says that standard_name may be used for time
>>>> coordinate variables.
>>>>
>>>> But the standard name table gives only one valid standard_name for a
>>>> time variable: "time".
>>>>
>>>> Can I assume then that there are no other standard names for time
>>>> coordinate variables?
>>>>
>>>> Thanks!
>>>>
>>>> Ed
>>>>
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>>
>>
>>
>>
>> -- 
>> CJ Beegle-Krause, Ph.D.
>> NOAA/NOS/ORR/Hazmat
>> 7600 Sand Point Way NE
>> Seattle, WA  98115
>>      voice:  (206) 526-6961
>>      fax:  (206) 526-6329
>>
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-- 
CJ Beegle-Krause, Ph.D.
NOAA/NOS/ORR/Hazmat
7600 Sand Point Way NE
Seattle, WA  98115
     voice:  (206) 526-6961
     fax:  (206) 526-6329

     <:}}}}}><
                           <:}}}}}><

\!/ \!/      \!/  >^<**>^<     \!/   \!/ \!/

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