[gradsusr] Gribmap question

[Becker, Bernd]

Wesley,

the -b option indeed switches the end of the average period with 
the start of the average period, 
but the mapping to .ctl would only work if the latter is also the
initial date of the data.
 
----- Time out of bounds:     1      15852   0  255     1    0  167 105
0 79   0 btim: 1998062200:00 tau:     8 dtim: 1998070100:00

I need to switch btim to be the start of the averaging period,
not the initial data time stored in the grib header. 

Seems a tough one.

Cheers,
Bernd.

-----Original Message-----
From: gradsusr-bounces at gradsusr.org
[mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Wesley Ebisuzaki
Sent: 15 July 2010 16:07
To: GrADS Users Forum
Subject: Re: [gradsusr] Gribmap question

Bernd,

          You need the -b option in gribmap

                 -b   -> use the start of the averaging period.

Status of -b

      grib1:
        gribmap supports -b
        grib2ctl does not support -b

     grib2:
         gribmap supports -b   (v2.0a8)
         g2ctl supports -b


        Wesley Ebisuzaki


Becker, Bernd wrote:
> Hi,
>
> how can I write a .ctl file for grib data, describing an average over 
> a period of days starting at a certain distance from the initial data 
> time?
>
> The Grib file contains 3 pieces of date information:
> time, the forecast run was initialized start time end time of 
> averaging period
>
> for each grib field in the file. The file contains 4 monthly means:
>
> initial time: 20100622
> start time  : 20100701
> end   time  : 30 days later (20100731)
>
> initial time: 20100622
> start time  : 20100801
> end   time  : 30 days later (20100831)
>
> initial time: 20100622
> start time  : 20100901
> end   time  : 29 days later (20100930)
>
> initial time: 20100622
> start time  : 20101001
> end   time  : 30 days later (20101031)
>
> tdef in ctl file :
> tdef 4  linear 00Z01Jul2010 1mo
>
> This does not work.
>
> I tried gribmap with:
> -t0
> -fnnn
> to no avail
> and need some input from you. 
>
> Many thanks!
> Bernd.
>
> --
> Bernd Becker   Climate Impacts Product Development
> Met Office Hadley Centre    FitzRoy Road  Exeter   Devon EX1 3PB
United
> Kingdom
> Tel.: +44 (0) 1392 884511 Fax: +44 (0)870 900 5050 
> E-mail:bernd.becker at metoffice.gov.uk -  http://www.metoffice.gov.uk
>
>
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>   

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