Re: 20041118: Decoders gribtocdl, gribtonc

• To: Arthur Clifford <art@xxxxxxxxxxxxxxxxxx>
• Subject: Re: 20041118: Decoders gribtocdl, gribtonc
• From: Robb Kambic <rkambic@xxxxxxxxxxxxxxxx>
• Date: Tue, 21 Dec 2004 09:24:51 -0700 (MST)

On Thu, 18 Nov 2004, Unidata Support wrote:

Arthur,

sorry it took so long to get back to you. the conventions are now the same
for the ETA211 and the WSETA.  i think this should solve your problems.

robb...

------- Forwarded Message

>To: support-casestudies@xxxxxxxxxxxxxxxx
>From: "Arthur Clifford" <art@xxxxxxxxxxxxxxxxxx>
>Subject: Case Studies - valtime_offset?
>Organization: UCAR/Unidata
>Keywords: 200411172132.iAHLW0Zh012846

Institution: The New Media Studio
Package Version: n/a
Operating System: n/a
Hardware Information: n/a
Inquiry: Hello, I am working on a project for Ben Domenico where I've retrieved 
information from DODS for ETA_211 and WSETA data that are case studies, but also for 
getting the "Latest" data.

I want to be able to display accurate time information. At the moment, I am 
using the valtimes returned (since they are unique) to calculate the date and 
hour a given grid is related to.

In the WSETA data valtime_ofset is 0, and there is only the one value. 
valtime_offset for ETA_211 has values of 0,6,12,18,24,30,36,42,48,54,and 60. 
(every 6 hours, there is an entry for every val_time/ref_time).

There is a datetime field but all its values are the same and appear to be the 
date the model was run rather than the date being forecast. ETA_211 has a 
forecast time but WSETA does not.

Is there anything anywhere that explains how ref_time, val_time, and val_time 
offset are determined and what they are for?

And, can I reliably use val_time to get the date for grids? Of coure, this is 
less an issue for case-studies as it is for handling Latest datasets.

Thanks for your time,

Art C.



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==============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
rkambic@xxxxxxxxxxxxxxxx                   WWW: http://www.unidata.ucar.edu/
==============================================================================