CDO

Hi,

I have a netcdf file generated by ncl. I can use GrADS to read this netcdf format. But when I want to use cdo to read it, it gives me the following error message

cdo infon: Open failed on >out1.nc<
Unsupported file structure
HDF5-DIAG: Error detected in HDF5 (1.8.7) thread 0:
#000: H5D.c line 391 in H5Dclose(): not a dataset
major: Invalid arguments to routine
minor: Inappropriate type

Error (cdf_close) : NetCDF: HDF error

Just in case you need more information, I also give the ncdump output

netcdf out1 {
dimensions:
lev = 6 ;
time = 732 ;
lat = 510 ;
lon = 1068 ;
variables:
float spi(lev, time, lat, lon) ;
spi:long_name = "SPI" ;
spi:_FillValue = 9.96921e+36f ;
double lev(lev) ;
lev:long_name = "Levels" ;
lev:units = "None" ;
lev:axis = "Z" ;
double time(time) ;
time:calendar = "standard" ;
time:units = "days since 1950-01-01 00:00:00" ;
time:standard_name = "time" ;
double lat(lat) ;
lat:axis = "Y" ;
lat:units = "degrees_north" ;
lat:long_name = "latitude" ;
lat:standard_name = "latitude" ;
double lon(lon) ;
lon:axis = "X" ;
lon:units = "degrees_east" ;
lon:long_name = "longitude" ;
lon:standard_name = "longitude" ;
}

Any idea why I get this error message?

Thanks,

Guilong