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20000823: Gempak, time series

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  • Subject: 20000823: Gempak, time series
  • Date: Wed, 23 Aug 2000 14:42:58 -0600
Luis,

Send email to address@hidden. That is fine. The support-gempak address
I use on the outbound mail is to file the support question in our online
tracking system which lets you search back through the GEMPAK support archives
regarding certain topics.

In regards to your gdtser question, Generally when you plot your ETA fields,
they just use TIME1 for f000-f048. The gdstat output grids use 2 times 
(TIME1:TIME2) to define the period over which your average is taken-
however this is to complex for gdtser which is looking for a single time.

So, you can use GDDIAG to rename the grids, eg:

GFUNC = AVETMPC
GLEVEL = 2
GVCORD = HAGL
GDATTIM = 990701/0000f024:990731/0000F024
GRDNAM = AVETMPC^990715/0000f024


In the above, the output grid will be named AVETMPC with only a single
time of F024 for July 15, 1999. You would run this for each
of your forecast times.

After completion, you will have these grids renamed into your grid file
with a single time (I picked the midpoint of the time average...but
you could use July 1 or July 31- whatever.

Now, it should be straight forward to plot the forecast times in
gdtser just as you would the individual ETA grids.

Steve Chiswell





>From: Luis Farfan <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200008231823.e7NINdN03923

>Steve,
>
>thanks for your note.
>
>Let me try try explain what I want to do: 
>a time series plot of average fields at a give station.
>The average fields are those derived from "gdstat", and 
>since I am using the ETA forecasts at 6 hourly intervals, 
>I only have the fields at F00,F06,F12,F18,...,F48. A plot
>of the 2-dimensional distribution via "gdcntr" is not what 
>I am looking for in this particular application.
>
>I may be confusing you when I included the values GDATTIM  =
>990701/0000F024:990731/0000F024 or GDATTIM  = all, but I just
>was trying to find what is the way to specify the period. 
>Perhaps, you suggestion of renaming the fields to a single 
>time would solve my problems.
>
>I am not familiar with the program "gddiag" and I would 
>appreciate your advice on how to use it for my purpose.
>
>By the way, should I sent my messages to support@unidata...
>and/or support-gempak@unidata...?
>
>Thank you for the help,
>
>Luis M Farfan.
>
>On Wed, 23 Aug 2000, Unidata Support wrote:
>> 
>> Luis,
>> 
>> I probably need clarification on what you are trying to do.
>> 
>> Do you want to plot the average field for each forecast time
>> f000 through f048 AVETMPC for July 99 in gdtser?
>> If thats the case, and you have AVETMPC for F000 though F048
>> in addition to the F024 you show below, you probably need to
>> use GDDIAG to rename the fields to a single time, rather than time1:time2.
>> I can show you how to do that.
>> 
>> >From your gdinfo output below, you have a 
>> single data field AVETMPC which is the monthly F024 average. You could
>> plot this data in gdcntr.
>> 
>> Again, since I'm not sure of what plot you are trying to produce.
>> 
>> Steve Chiswell
>