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Re: [netcdfgroup] Viewing NetCDF CF-1.3 files in IDV version 2.5

Tim,

Did you try the on-line CF compliance checker?

  http://cf-pcmdi.llnl.gov/conformance/compliance-checker/
One thing I noticed is that basetime:units contains two time-of-day strings after the date. This is patently illegal, and it might be your whole problem.
Also, there are no standard_name or axis attributes on your coordinate variables. I think these are optional by CF, but there is a chance that IDV has some dependency on them.
Did you check IDV documentation for a possible list of required metadata? That may give you a more concise checklist than the entire CF spec. HTH. 

Dave Allured
CU/CIRES Climate Diagnostics Center (CDC)
http://cires.colorado.edu/science/centers/cdc/
NOAA/ESRL/PSD, Climate Analysis Branch (CAB)
http://www.cdc.noaa.gov/

Timothy Hume wrote:

Hi,

I have just installed IDV 2.5 from the Unidata website. I have a CF compliant 
(I think) NetCDF file which I am unable to view in IDV. The error message I 
keep getting says that the file contains no gridded data. I am guessing the 
problem is that my file is not really CF compliant. The CDL below shows the 
structure of my file. I was wondering if anyone can spot any obvious mistakes I 
am making with the conventions?

Thanks for any help,

Tim Hume
Centre for Australian Weather and Climate Research
Melbourne
Australia 
----

netcdf ecmwf_0p5deg_ocf_t2m_mars_opn {
dimensions:
        forecast = 32 ;
        basetime = UNLIMITED ; // (100 currently)
        latitude = 121 ;
        longitude = 101 ;
        bounds = 2 ;
variables:
        double forecast(forecast) ;
                forecast:long_name = "Time of model forecast, relative to the 
basetime" ;
                forecast:units = "hours" ;
                forecast:bounds = "forecast_bounds" ;
        double forecast_bounds(forecast, bounds) ;
                forecast_bounds:long_name = "forecast interval" ;
                forecast_bounds:units = "hours" ;
        int basetime(basetime) ;
                basetime:long_name = "Model basetime" ;
                basetime:units = "seconds since 1970-01-01 00:00:00.0 0:00" ;
                basetime:calendar = "gregorian" ;
        double latitude(latitude) ;
                latitude:long_name = "latitude" ;
                latitude:units = "degrees_north" ;
                latitude:bounds = "latitude_bounds" ;
                latitude:valid_min = -90. ;
                latitude:valid_max = 90. ;
        double latitude_bounds(latitude, bounds) ;
                latitude_bounds:long_name = "grid cell latitude boundaries" ;
                latitude_bounds:units = "degrees_north" ;
                latitude_bounds:valid_min = -90. ;
                latitude_bounds:valid_max = 90. ;
        double longitude(longitude) ;
                longitude:long_name = "longitude" ;
                longitude:units = "degrees_east" ;
                longitude:bounds = "longitude_bounds" ;
                longitude:valid_min = -360. ;
                longitude:valid_max = 360. ;
        double longitude_bounds(longitude, bounds) ;
                longitude_bounds:long_name = "grid cell longitude boundaries" ;
                longitude_bounds:units = "degrees_east" ;
                longitude_bounds:valid_min = -360. ;
                longitude_bounds:valid_max = 360. ;
        float temperature_2m(basetime, forecast, latitude, longitude) ;
                temperature_2m:long_name = "2m temperature" ;
                temperature_2m:units = "K" ;
                temperature_2m:_FillValue = 9.96921e+36f ;
                temperature_2m:missing_value = 9.96921e+36f ;
                temperature_2m:valid_min = 180.f ;
                temperature_2m:valid_max = 330.f ;
                temperature_2m:standard_name = "air_temperature" ;
                temperature_2m:cell_methods = "lat: lon: mean (area weighted)" ;
        double level ;
                level:long_name = "Height above the surface" ;
                level:units = "m" ;

// global attributes:
                :Conventions = "CF-1.3" ;
                :history = "File created by the Gridded OCF data ingest system" 
;
                :institution = "Australian Bureau of Meteorology" ;
                :source = "model" ;
                :title = "ECMWF forecasts of temperature_2m; resolution: 0.5 degree; 
source: mars" ;
}
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