[gradsusr] Query re working with lats4d...

[Wesley Ebisuzaki]

John,

   I am not a user of lat4d but my understanding is that lats4d creates 
a custom
grib table for every file.  wgrib doesn't know about the grib table, so 
it uses
the operational NCEP table.

     Wesley Ebisuzaki


Filipkowski, John D wrote:
>  
> Hi GrADS users! 
>  
>  - I'm looking for a link  or  reference do the following: 
>  
> For a GRIB-1 file, for a selected variable, I want to:
>   Smooth the data, output smoothed field to GRIB-1 format   ..
>  
> Test data:
> Input files:       *TSTM.ctl*
> *                      TSTM.grib                      - GRIB-1 data 
> file *
> *                      TSTM.grib.idx*
>  
>  
> *wgrib  TSTM.grib*
> 1:0:d=10060912:TSTM:kpds5=60:kpds6=1:kpds7=0:TR=4:P1=0:P2=0:TimeU=1:sfc:0-0hr 
> acc:NAve=0
>  
> *Contents ot TSTM.ctl*
> dset  ^TSTM.grib
> index ^TSTM.grib.idx
> undef 9.999E+20
> title  TSTM.grib
> * produced by grib2ctl v0.9.12.5p32
> dtype grib 212
> pdef 185 129 lcc 35.0 -95.0 105 49 25 25 -95 40635 40635
> xdef 181 linear -140. 0.5
> ydef  91 linear  15  0.5
> tdef 1 linear 12Z09jun2010 1mo
> zdef 1 linear 1 1
> vars 1
> TSTMsfc  60,1, 0      ** surface Thunderstorm probability [%]
> ENDVARS
>  
> I've used the "lats4d" utility of gradsc/gradsnc as follows:
>> *gradsnc  -blc 'lats4d -v -q -i TSTM.ctl  -ftype ctl -func  
>> smth9(tstmsfc) -o test  -format grads_grib'*
>>  
>>  
>> *Output:  (excerpted)...*
>> lats4d: vertical levels 1
>> lats4d: using PRESSURE for vertical coordinate
>> ...
>> lats4d: Function expression smth9(tstmsfc)
>> lats4d: surface  variables  tstmsfc
>> lats4d: writing to grads_grib file test.grb on 12Z09JUN2010
>>  ...
>>  
>> *wgrib  test.grb*
>> Undefined parameter table (center 100-2 table 128), using NCEP-opn
>> 1:0:d=10060912:*PRES*:kpds5=1:kpgs6=1:kpds7=0:TR=0:P1=0:P2=0:TimeU=1:sfc:anl:Nave=0 
>>
>>  
>> I don't understand why the data written to the new GRIB file is now 
>> called "PRES"...
>>  
>> Can anyone shed some light on this?
>>  
>> Cheers,
>>  
>>  
>>  
>  
>
>
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