problem reading a grib file

Added by christophe chaussin about 7 years ago

Hello,

I have a problem reading a specific grib file with cdo.
It seems that cdo only reads the first variable in this file and not the next ones.
Here is the version of cdo used :

Climate Data Operators version 1.6.4rc6 (http://code.zmaw.de/projects/cdo)
 Compiled: by ribiere on prev.der.edf.fr (x86_64-unknown-linux-gnu) May 26 2014 15:39:02
 Compiler: gcc -std=gnu99 -g -O2 -fopenmp 
   version: gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-3)
 Features: PTHREADS OpenMP NC4 Z
 Libraries:
 Filetypes: srv ext ieg grb grb2 nc nc2 nc4 nc4c 
     CDI library version : 1.6.4rc3 of May 26 2014 15:38:55
 CGRIBEX library version : 1.6.4 of Mar 28 2014 13:24:51
 GRIB_API library version : 1.12.3
  netCDF library version : 4.1.1 of Jan 30 2014 05:31:22 $
    HDF5 library version : 1.8.5
 SERVICE library version : 1.3.2 of May 26 2014 15:38:39
   EXTRA library version : 1.3.2 of May 26 2014 15:38:34
     IEG library version : 1.3.2 of May 26 2014 15:38:38
    FILE library version : 1.8.2 of May 26 2014 15:38:34

There is 4 variables in my file :
grib_get -m -P shortName 2566000000.20170327000000

ws sfc 20170327 0000 3 32.1
...
2t sfc 20170327 0000 3 11.1
...
tcc sfc 20170327 0000 3 71.1
...
unknown sfc 20170327 0000 3 105.149

but cdo only reads the first one :

cdo sinfo 2566000000.20170327000000
File format : GRIB
-1 : Institut Source Ttype Levels Num Points Num Dtype : Parameter ID
1 : unknown unknown instant 1 1 12240 1 P12 : 32.1
Grid coordinates :
1 : lonlat : points=12240 (136x90)
lon : -5.2 to 8.3 by 0.1 degrees_east
lat : 51.2 to 42.3 by -0.1 degrees_north
Vertical coordinates :
1 : height : levels=1
height : 10 m
Time coordinate : unlimited steps
RefTime = 2017-03-27 00:00:00 Units = hours Calendar = proleptic_gregorian

With another file given by the same provider, everything seems to work fine :
cdo sinfo 0490000000.20170327000000

File format : GRIB
    -1 : Institut Source   Ttype    Levels Num    Points Num Dtype : Parameter ID
     1 : ECMWF    unknown  instant       1   1      1221   1  P16  : 186.128       
     2 : ECMWF    unknown  instant       1   1      1221   1  P16  : 187.128       
     3 : ECMWF    unknown  instant       1   1      1221   1  P16  : 188.128       
     4 : ECMWF    unknown  instant       1   1      1221   1  P16  : 165.128       
     5 : ECMWF    unknown  instant       1   1      1221   1  P16  : 166.128       
     6 : ECMWF    unknown  instant       1   1      1221   1  P16  : 167.128       
     7 : ECMWF    unknown  instant       1   1      1221   1  P16  : 164.128       
   Grid coordinates :
     1 : lonlat                   : points=1221 (33x37)
                              lon : 7 to 11 by 0.125 degrees_east
                              lat : 44.5 to 40 by -0.125 degrees_north
etc ...

Any kind of help will be warmly welcome

Cheers,

Christophe

Download all files

0490000000.20170327000000 (956 KB) 0490000000.20170327000000
2566000000.20170327000000 (5.63 MB) 2566000000.20170327000000

Replies (1)

RE: problem reading a grib file - Added by Uwe Schulzweida about 7 years ago

The records in the file 2566000000.20170327000000 are sorted by variable:

ws sfc 20170327 0000 3 32.1
ws sfc 20170327 0000 4 32.1
ws sfc 20170327 0000 5 32.1
...
2t sfc 20170327 0000 3 11.1
2t sfc 20170327 0000 4 11.1
2t sfc 20170327 0000 5 11.1
...
tcc sfc 20170327 0000 3 71.1
tcc sfc 20170327 0000 4 71.1
tcc sfc 20170327 0000 5 71.1
...
unknown sfc 20170327 0000 3 105.149
unknown sfc 20170327 0000 4 105.149
unknown sfc 20170327 0000 5 105.149
...

But CDO supports only GRIB files sorted by time:

ws sfc 20170327 0000 3 32.1
2t sfc 20170327 0000 3 11.1
tcc sfc 20170327 0000 3 71.1
unknown sfc 20170327 0000 3 105.149
ws sfc 20170327 0000 4 32.1
2t sfc 20170327 0000 4 11.1
tcc sfc 20170327 0000 4 71.1
unknown sfc 20170327 0000 4 105.149
ws sfc 20170327 0000 5 32.1
2t sfc 20170327 0000 5 11.1
tcc sfc 20170327 0000 5 71.1
unknown sfc 20170327 0000 5 105.149
...

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