[CF-metadata] analysis and forecast data

[Beate.Geyer at gkss.de]

Dear member of CF community,
I got data from GCM-output to convert to netCDF with CF-standard.
The data include multiple forecasts from multiple analysis (6-hourly 
analysis and additional 3h and 6h forecast).
Therefore I introduced an additional forecast dimension, but the 
'CF-Convention compliance checker' refused that solution.
How should the structure looks like?
Thanks for your help,
Beate Geyer
 
netcdf example {
dimensions:
                 time = UNLIMITED ; // (5 currently)
                 forecast = 3 ;
                 lat = 1 ;
                 lon = 1 ;
                 tbnds = 2 ;
variables:
                 float ASOD_T(time, forecast, lat, lon) ;
                                 ASOD_T:units = "W m-2" ;
                                 ASOD_T:long_name = "toa downward 
shortwave radiation" ;
                                 ASOD_T:standard_name = 
"toa_incoming_shortwave_flux" ;
                 float forecast(forecast) ;
                                 forecast:units = "h" ;
                                 forecast:standard_name = 
"forecast_period" ;
                 float lat(lat) ;
                                 lat:units = "degrees_north" ;
                                 lat:long_name = "latitude" ;
                                 lat:standard_name = "latitude" ;
                 float lon(lon) ;
                                 lon:units = "degrees_east" ;
                                 lon:long_name = "longitude" ;
                                 lon:standard_name = "longitude" ;
                 double time(time) ;
                                 time:units = "minutes since 1970-01-01 
00:00:00" ;
                                 time:standard_name = "time" ;
                                 time:bounds = "time_bnds" ;
                 double time_bnds(time, tbnds) ;
                                 time_bnds:units = "minutes since 
1970-01-01 00:00:00" ;
                                 time_bnds:long_name = "time bounds" ;

// global attributes:
                                 :Conventions = "CF-1.0" ;
data:

 forecast = 0, 3, 6 ;

 time = 17223720, 17224080, 17224440, 17224800, 17225160 ;
}

CF-Convention compliance checker result:
CHECKING NetCDF FILE
=====================
------------------
Checking variable: time_bnds
------------------
------------------
Checking variable: time
------------------
------------------
Checking variable: lat
------------------
------------------
Checking variable: lon
------------------
------------------
Checking variable: ASOD_T
------------------
ERROR: Variable has more than 1 coordinate variable with same axis value
------------------
Checking variable: forecast
------------------
ERRORS detected: 1
WARNINGS given: 0

====================================================
 Dr. Beate Geyer 
 GKSS Research Centre 
 Institute for Coastal Research 
 Max-Planck-Str. 
 D-21502 Geesthacht, Germany 

E-Mail:   Beate.Geyer at gkss.de
Phone:  04152-872016
====================================================
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