CDO

Dear User,
I have concatenated three NetCDF file into one file using the following command.

cdo -r cat DJFmean1991-1992.nc DJFmean1992-1993.nc DJFmean1993-1994.nc test.nc

However, when I open this resultant (test.nc) file in GrADS, I face the following error.

ga-> sdfopen test.nc
Scanning self-describing file: test.nc
gadsdf: Time unit has too small an increment (min. 1 minute).

Could you please tell me how to solve this error.

Please find below the header information of the NetCDF file.

netcdf test {
dimensions:
lon = 291 ;
lat = 210 ;
time = UNLIMITED ; // (3 currently)
variables:
double lon(lon) ;
lon:standard_name = "longitude" ;
lon:long_name = "Longitude" ;
lon:units = "degrees_east" ;
lon:axis = "X" ;
double lat(lat) ;
lat:standard_name = "latitude" ;
lat:long_name = "Latitude" ;
lat:units = "degrees_north" ;
lat:axis = "Y" ;
double time(time) ;
time:standard_name = "time" ;
time:units = "days since 0-00-00 00:00:00" ;
time:calendar = "proleptic_gregorian" ;
double rainm(time, lat, lon) ;
rainm:_FillValue = -999000000. ;

// global attributes:
:CDI = "Climate Data Interface version 1.5.3 (http://code.zmaw.de/projects/cdi)" ;
:Conventions = "CF-1.4" ;
:history = "Fri Feb 08 19:13:27 2013: cdo -r cat DJFmean1991-1992.nc DJFmean1992-1993.nc DJFmean1993-1994.nc test.nc" ;
:CDO = "Climate Data Operators version 1.5.3 (http://code.zmaw.de/projects/cdo)" ;
}

Thanks.
SBR