Re: [ferret_users] combine ncdf files with nc2mc.sh

[Hella Riede <hella.riede@xxxxxxx>]

Dear Estanis,

looking into the script code of nc2mc here, http://www.pa.op.dlr.de/~PatrickJoeckel/nc2mc/nc2mc, you can see that this error message is triggered if 'tline' of the first nc file to be added to the descriptor file does not contain 1 or 4 fields:

switch (${#tline})
case 1:
   # special case
   echo 'WARNING: FORMAT OF units-ATTRIBUTE OF '$tname' NOT RECOGNIZED: '$tline
   set tline = ( "${tline}" "since" "0001-01-01" "00:00:00" )
   echo '... using '${tline} 'instead.'
   breaksw
case 4:
   # OK, do nothing
   breaksw
default:
   echo 'ERROR: FORMAT OF units-ATTRIBUTE OF '$tname' NOT RECOGNIZED: '$tline
   exit 4
   breaksw
endsw

'tline' is the line in a netCDF file that contains the time units, e.g., 'hours since 01-Jan-1900 00:00:00'. 4 fields would be the typical case, in this case field 1 is 'hours', field 2 is 'since', field 3 is '01-Jan-1900', and field 4 is '00:00:00'.

So the error does *not* relate to your already existing descriptor file, but to the first *.nc file to be added, which would be 'nemo1.nc' in your example. In a shell, execute this command to check the time units in your netCDF file and find out why it does not have 4 fields: ncdump -h nemo1.nc | less.

I actually wonder where your descriptor file comes from if nc2mc aborted with an error ...


Best wishes,
Hella




On 06/23/2017 08:13 PM, Estanislao Gavilan Pascual-Ahuir (PGR) wrote:
> Dear Community,
> 
> 
> I am trying to combine 2 ncdf files using nc2mc.sh. But I am having this error
> 
> 
> ERROR: FORMAT OF units-ATTRIBUTE OF t NOT RECOGNIZED:
> 
> Thanks in advance for all your help.
> 
> 
>  My descriptor file is:
> 
>  &FORMAT_RECORD
>      D_TYPE        = '  MC',
>      D_FORMAT      = '  1A',
>      D_SOURCE_CLASS       = 'MODEL OUTPUT',
>  /
>  &BACKGROUND_RECORD
>       D_EXPNUM      = 'Control',
>       D_TITLE       = '',
>       D_T0TIME      = '01-Jan-1900 00:00:00',
>       D_TIME_UNIT   = 1.0,
>       D_TIME_MODULO = .FALSE.,
>  /
>  &MESSAGE_RECORD
>       D_MESSAGE     = ' ',
>       D_ALERT_ON_OPEN      = F,
>       D_ALERT_ON_OUTPUT    = F,
>  /
>  &EXTRA_RECORD
>  /
>  &STEPFILE_RECORD
>        s_filename    = 'nemo1.nc',
>        S_START       = 3471508800,
>        S_END  = 4417156800,
>        S_DELTA       = 432000,
>        S_NUM_OF_FILES       = 1,
>        S_REGVARFLAG  = ' ',
>  /
>  &STEPFILE_RECORD
>        s_filename    = 'nemo2.nc',
>        S_START       = 4417588800,
>        S_END  = 6309316800,
>        S_DELTA       = 432000,
>        S_NUM_OF_FILES       = 1,
>        S_REGVARFLAG  = ' ',
>  /
>  &STEPFILE_RECORD
>        s_filename    = '**END OF STEPFILES**'
>  /
> 
> 
> Kind regards,
> 
> 
> Estanis
> 
> 

-- 
...............................................................................
  Hella Riede      hella.riede@xxxxxxx
  Air chemistry department: Modeling & Global Observations
  Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, 55128 Mainz, Germany
  www.mpic.de   www.caribic.de
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