Re: gribtocdl

• To: Werner Frerichs <frerichs@xxxxxxxxxxxxx>
• Subject: Re: gribtocdl
• From: Robb Kambic <rkambic@xxxxxxxxxxxxxxxx>
• Date: Thu, 10 Apr 2003 13:13:38 -0600 (MDT)

On Wed, 9 Apr 2003, Werner Frerichs wrote:

Dear Robb,
I try to convert a Gribfile to NetCDF with gribtocdl and gribtonc but it
doesnot work, because gribtocdl produce inconsitent values for lon. The
Grid is 51x51 by 0.2 degree stepps. The Grid run from 5 to 15 lon and 50
to 60 lat.

Gribtocdl say there is a Grid from 51x51 by 0.2 degree step. But the
Grid run from 5 to 15.20 lon and not from 5.00 to 15.00.

Werner,

Thanks for bringing this problem to my attention, it will be fixed in the
next release.  Until then, if you delete the 15.20 entry from the lon list
then gribtonc will work fine because it will only have 51 entries. I
tested this using your cdl and grib file.  gribtocdl does have it's
problems, in my notes I mention that it creates a cdl as a starting point
that usually needs some modifications.

Thanks,
Robb...

I used decoders-2.4.4.tar.Z from ftp://ftp.unidata.ucar.edu/pub/decoders

Output wgrib:

wetterwelt@karibik:/winnt/geo > wgrib -V GEWWK_02_u_12-1.grb
rec 1:0:date 2003040812 UGRD kpds5=23 kpds6=1 kpds7=0 levels=(0,0)
grid=255 sfc 12hr fcst:
  UGRD=Wind u-component [m/s]
  timerange 0 P1 12 P2 0 TimeU 1  nx 51 ny 51 GDS grid 0 num_in_ave 0
missing 0
  center 99 subcenter 0 process 255 Table 200
  latlon: lat  50.000000 to 60.000000 by 0.200000  nxny 2601
          long 5.000000 to 15.000000 by 0.200000, (51 x 51) scan 64 mode
128 bdsgrid 1
  min/max data -5.87854 3.21521  num bits 12  BDS_Ref -5.87854  DecScale
0 BinScale -8


Have you an answer, why gribtocdl done wrong ? I attached the CDL- and
Gribfile.

Thanks Werner

--
#------------------------------------------------------------------------------#
Werner Frerichs
WetterWelt
Schauenburger Str. 116 , D-24118 Kiel / Germany
Tel: +49 431 5606670
Fax: +49 431 5606675
E-mail: frerichs@xxxxxxxxxxxxx
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==============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
rkambic@xxxxxxxxxxxxxxxx                   WWW: http://www.unidata.ucar.edu/
==============================================================================