[gradsusr] Lats4d

[Wesley Ebisuzaki]

I would make a grib2 file.  (Directly from GrADS?  Convert from grib1 -> 
grib2?)

wgrib2 can change the various parameters by

      wgrib2 IN.grb -set center C -set subcenter S  -set  
analysis_or_forecast_process_id P -set table_3.4 SCAN -grib OUT.grb

C=center number
S=subcenter number
P=process id
SCAN=scan parameter

Finally I would say, "Grib1 is obsolete, you are getting a grib2 file.  
Deal with it!"

* I am not sure whether cnvgrib will handle files with center != NCEP *

--------------------------------------------------------------------------------------------------------------------------------------

Alternatively I would modify a short C program (see 
ftp://ftp.cpc.ncep.noaa.gov/wd51we/grib_fixers)
to change the various parameters.

If the tools were already installed and grib2 output were acceptable, I 
would use the first procedure.
If I knew C and grib1, the second method were be better.


           Wesley





Arlindo da Silva wrote:
> 2011/11/14 Дарья <darik777 at i.ua <mailto:darik777 at i.ua>>
>
>     According to wgrib .grb file created by  lats4d command has the
>     following structure
>
>     rec 1:0:date 2007081500 TMP kpds5=11 kpds6=1 kpds7=0 levels=(0,0)
>     grid=255 sfc anl:
>      TMP=Temp. [K]
>      timerange 0 P1 0 P2 0 TimeU 1  nx 209 ny 139 GDS grid 0
>     num_in_ave 0 missing
>     0
>      center 100 subcenter 2 process 13 Table 128
>      latlon: lat  37.788000 to 48.977000 by 0.081000  nxny 29051
>              long 21.610000 to 38.475000 by 0.081000, (209 x 139) scan
>     2 mode 128 bdsgrid 1
>      min/max data 271.97 300.67  num bits 9  BDS_Ref 2719.7  DecScale
>     1 BinScale 0
>
>     However, I need to change some parameters of the grb file:
>     "grid" (from 255 to 3)
>     "center" (from 100 to 7)
>     "subcenter" (from 2 to 0)
>      "process" (from 13 to 82)
>     "scan" (from 2 to 0)
>
>     Is there any way to do it by lats4d command?
>
>
> You can control some of the details of the grib-1 file with a lats 
> parameter table, see the lats4d documentation (with "lats4d.sh -h"). 
> When a parameter table it is not specified, lats4d creates one for you 
> on the fly. Look for file .grads.lats.table on the directory you ran 
> lats4d from. Rename this file and edit it by hand. However, not 
> everything can be customized this way. 
>
> Wes, the resident GRIB wizard,  may be able to suggest some wgrib 
> trick for doing this.
>
>      Arlindo
>
>
>
>
>  
>
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> -- 
> Arlindo da Silva
> dasilva at alum.mit.edu <mailto:dasilva at alum.mit.edu>
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