[gradsusr] g2grb subregion

[Mike Manning]

Thanks Wesley,

I'll give that a try this week :)

Cheers, Mike


On 19/05/2012 1:07 AM, Wesley Ebisuzaki wrote:
> Mike,
>
>    The error message suggests that you haven't installed all the files 
> needed
> for g2grb.gs <http://g2grb.gs> to run. You need
>
>  template.grb2 in the $GADDIR directory
>  you need wgrib2 (v1.8.4+)   on your path
>
>
> BTW The simpler way of making regional grib2 subset is to use wgrib2.
>
>   For lat-lon -> subset lat-lon: use the -small_grib option
>
>     wgrib2 IN.grb2 -set_grib_type j  -small_grib 100:170 -55:0 OUT.grb2
>
> You can also interpolate to a lat-lon grid by the -new_grid option.
>
>    Yours,
>    Wesley
>
>
>
> On Fri, May 18, 2012 at 3:19 AM, Mike Manning <michael at bsch.au.com 
> <mailto:michael at bsch.au.com>> wrote:
>
>     Hi all,
>
>     I've got data downloaded from an archive now however I'd like to
>     extract
>     a subregion from the grib2 files using g2grb.  I've created a test.ctl
>     files as follows:
>
>     'open gfs.00z.ctl'
>     'set lat -55 0'
>     'set lon 100 170'
>     'g2grb LFTXsfc extrap.grb UGRD:1000 mb:anl:packing=j:center=7'
>     #'g2grb h(lev=925) +extrap.grb HGT:925 mb:anl:packing=j:center=7'
>     #'g2grb h(lev=850) +extrap.grb HGT:850 mb:anl:packing=j:center=7'
>     #'g2grb h(lev=700) +extrap.grb HGT:700 mb:anl:packing=j:center=7'
>     #'g2grb h(lev=600) +extrap.grb HGT:600 mb:anl:packing=j:center=7'
>     #'g2grb h(lev=500) +extrap.grb HGT:500 mb:anl:packing=j:center=7'
>     quit
>
>
>     I run it using grads -blc however it's throwing up some errors:
>     Starting "/grads2/Linux/Versions/2.0.a9.oga.1/i686/grads   -blc
>     test.ctl
>     " ...
>
>
>     Grid Analysis and Display System (GrADS) Version 2.0.a9.oga.1
>     Copyright (c) 1988-2010 by Brian Doty and the
>     Institute for Global Environment and Society (IGES)
>     GrADS comes with ABSOLUTELY NO WARRANTY
>     See file COPYRIGHT for more information
>
>     Config: v2.0.a9.oga.1 little-endian readline printim grib2 netcdf
>     hdf4-sds hdf5 opendap-grids,stn athena geotiff shapefile
>     Issue 'q config' command for more detailed configuration information
>     Loading User Defined Extensions table
>     </grads2/Linux/Versions/2.0.a9.oga.1/i686/gex/udxt> ... ok.
>     GX Package Initialization: Size = 11 8.5
>     Running in Batch mode
>     dlon=1 nx = 71 lon0 = 100
>     Y is varying   Lat = -55 to 0   Y = 36 to 91
>     dlat=1 ny = 56 lat0 = -55
>     need to generate date
>     new inv=d=2011121000:UGRD:1000 mb:anl:packing=j:center=7
>     new grads found undef=-999000000.000000
>     making template file
>     ! /grads2/wgrib2 $GADDIR/template.grb2 -d 1 -lola 100:71:1 -55:56:1
>     extrap.grb.template grib
>     argument: -lola ????
>     argument: 100:71:1 ????
>     argument: -55:56:1 ????
>     argument: extrap.grb.template ????
>     argument: grib ????
>     missing GRIB record(s)
>     opening fwrite extrap.grb.tmp
>     going to display LFTXsfc
>     result is Wrote 3976 of 3976 elements to extrap.grb.tmp as Sequential
>     Big_Endian
>
>     metadata = 1:0:d=2011121000:UGRD:1000 mb:anl:packing=j:center=7:
>     ! /grads2/wgrib2  extrap.grb.template -import_ieee extrap.grb.tmp
>     -set_metadata extrap.grb.inv -undefine_val -999000000.000000 -grib_out
>     extrap.grb
>     argument: -import_ieee ????
>     argument: extrap.grb.tmp ????
>     argument: -set_grib_type ????
>     argument: c3 ????
>     argument: -set_metadata ????
>     argument: extrap.grb.inv ????
>     argument: -undefine_val ????
>     argument: -999000000.000000 ????
>     argument: -grib_out ????
>     argument: extrap.grb ????
>     could not open file: extrap.grb.template
>
>     !rm extrap.grb.tmp extrap.grb.inv extrap.grb.template
>     rm: cannot remove `extrap.grb.template': No such file or directory
>
>
>     I'm not sure why it's not working :( All I'd like to do is extract the
>     subregion from lat -55 to 0 and lon 100 to 170 for all variables
>     in the
>     grib data files I've downloaded.
>
>     Cheers, Mike
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