[gradsusr] regridding issues with lats4d

[Fishel, Greg]

Well, I now have a grib file, but the time (48 hour fcst) has been changed
to analysis, and the variable has been changed from snodsfc (snow depth
surface) to PRES. I must confess I do not understand this lats parameter
table. How do I know what the contents of this table are, and is there a
chance that snodsfc is missing from that table?

Greg

On 11/29/12 10:53 PM, "Lee Byerle" <lbyerle at yahoo.com> wrote:

>
>Greg,
>
>Assuming lats4d is reading the file correctly, you should also include
>the regrid function to interpolate.  Below is an example for re-gridding
>to uniform 1-deg globally (with -format grads_grib )
>
>lats4d.sh -i cfs.snow.grib2.ctl -vars snodsfc -func
>'re(@,360,linear,0,1,181,linear,-90,1.,bl)' -de gfs.snow.grib2.ctl -o
>-format grads_grib cfs.snow.newgrid.grib2
>
>lats4d may not work properly for grib2 files. You may also consider using
>wgrib2.  An example is:
>
>wgrib2 ens_all_old.grb2  -new_grid_winds earth -new_grid_interpolation
>bilinear -new_grid latlon 0:360:1 90:181:-1 ens_all_new.grb2
>
>Web pages for reference:
>http://www.cpc.ncep.noaa.gov/products/wesley/wgrib2/
>http://opengrads.org/doc/scripts/lats4d/
>
>good luck,
>Lee
>
>
>
>
>On Nov 29, 2012, at 7:03 PM, Fishel, Greg wrote:
>
>> I am extremely new to Grads, so I apologize in advance if this question
>> seems too basic. I work for a television station, and am always
>> experimenting with getting different datasets on the air. Unfortunately,
>> our graphics system does not care for the gaussian grids. So I am
>> attempting to use lats4d to interpolate some of the cfs products onto a
>> standard gfs grid. My script is not giving me any error messages but the
>> grib file being written is empty. Below is my bash script. The data
>> downloads fine, and control and index files are created for both the cfs
>> and gfs without any issues. Any help would be much appreciated. Thanks!
>> 
>> cd $MODEL/gfs
>> 
>> #----------------------------------------------DOWNLOAD CFS AND GFS SNOW
>> DEPTH FORECASTS FOR A SINGLE TIME--------------------------------------
>> 
>> wget -O gfs.snow.grib2
>> 
>>"http://nomads.ncep.noaa.gov/cgi-bin/filter_gfs_hd.pl?file=gfs.t12z.maste
>>rg
>> rb2f00&lev_surface=on&\
>> 
>>var_SNOD=on&leftlon=0&rightlon=360&toplat=90&bottomlat=-90&dir=%2Fgfs.201
>>21
>> 12912%2Fmaster"
>> 
>> 
>>MOD_URL="http://nomads.ncep.noaa.gov/pub/data/nccf/com/cfs/prod/cfs/cfs.2
>>01
>> 21129/12/6hrly_grib_01/ocnf2012121100.01.2012112912.grb2"
>> 
>>MOD_URL_IDX="http://nomads.ncep.noaa.gov/pub/data/nccf/com/cfs/prod/cfs/c
>>fs
>> .20121129/12/6hrly_grib_01/ocnf2012121100.01.2012112912.grb2.idx"
>> 
>> get_inv.pl $MOD_URL_IDX | grep ":SNOD:surface" | get_grib.pl $MOD_URL
>> cfs.snow.grib2
>> 
>> 
>> #-------------------------CREATE CONTROL AND INDEX FILES FOR CFS AND GFS
>> 
>>DATA---------------------------------------------------------------------
>>--
>> ----
>> 
>> 
>> g2ctl gfs.snow.grib2 > gfs.snow.grib2.ctl
>> gribmap -v -i gfs.snow.grib2.ctl
>> 
>> #-----------------CREATE GRADS
>> 
>>FILES--------------------------------------------------------------------
>>--
>> -----------------------------------------
>> 
>> g2ctl cfs.snow.grib2 > cfs.snow.grib2.ctl
>> gribmap -v -i cfs.snow.grib2.ctl
>> 
>> 
>> #---------------------------INTERPOLATE CFS DATA ONTO GFS
>> 
>>GRID---------------------------------------------------------------------
>>--
>> --------
>> 
>> 
>> 
>> 
>> lats4d.sh -i cfs.snow.grib2.ctl -vars snodsfc -o cfs.snow.newgrid.grib2
>> -format grib -de gfs.snow.grib2.ctl
>> 
>> 
>> 
>> 
>> 
>> 
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>
>
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