[gradsusr] Lats4d

[Дарья]

When I try to convert grib1 to grib2 with 
cnvgrib it fails with the message
 param_g1_to_g2:GRIB1 param  11  not found. for table version     128

I think this is because grib1 files created by "lats4d" 
have the parameter
table = 128

I wonder how lats4d specifies table number and is there any way to set
this parameter to another value 
(I have grib1 files from another source with table = 2 and there is no
problem converting them to grib2)

> 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 Finally I would say, "Grib1 is obsolete, you are getting a grib2 file.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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