NetCDF file won't open.

• To: idvusers@xxxxxxxxxxxxxxxx
• Subject: NetCDF file won't open.
• From: Aaron Dalton <aadalton@xxxxxx>
• Date: Tue, 27 Sep 2005 15:07:12 -0400

I'm creating a CF-1.0 complient dataset for MODIS NDVI Data spanning the 
period of record.  Unfortunately IDV doesn't seem to recognize any of the data 
elements in the file.  Attatched is the NetCDF header.  I've run through the 
CF-1.0 compliance checker and the file checks out.  What am I doing wrong?   
Are there any undocumented gotcha's that I need to watch out for?

Thanks,  
Aaron Dalton

netcdf NDVI_ALL {
dimensions:
        x = 3531 ;
        y = 1720 ;
        time = 128 ;
variables:
        int Albers_Equal_Area ;
                Albers_Equal_Area:grid_mapping_name = 
"albers_conical_equal_area" ;
                Albers_Equal_Area:standard_parallel = 37., 39. ;
                Albers_Equal_Area:longitude_of_central_meridian = -79.5 ;
                Albers_Equal_Area:latitude_of_projection_origin = 38. ;
        char projectionCoordSys ;
                projectionCoordSys:_CoordinateAxes = "time y x" ;
                projectionCoordSys:_CoordinateTransforms = "Albers_Equal_Area" ;
        short time(time) ;
                time:long_name = "observation time" ;
                time:units = "days since 2000-01-01" ;
                time:_CoordinateAxisType = "Time" ;
        double y(y) ;
                y:units = "m" ;
                y:long_name = "y coordinate of projection" ;
                y:standard_name = "projection_y_coordinate" ;
                y:_CoordinateAxisType = "GeoY" ;
        double x(x) ;
                x:units = "m" ;
                x:long_name = "x coordinate of projection" ;
                x:standard_name = "projection_x_coordinate" ;
                x:_CoordinateAxisType = "GeoX" ;
        double lat(y, x) ;
                lat:units = "degrees_north" ;
                lat:long_name = "latitude coordinate" ;
                lat:standard_name = "latitude" ;
                lat:_CoordinateAxisType = "Lat" ;
        double lon(y, x) ;
                lon:units = "degrees_east" ;
                lon:long_name = "longitude coordinate" ;
                lon:standard_name = "longitude" ;
                lon:_CoordinateAxisType = "Lon" ;
        short NDVI(time, y, x) ;
                NDVI:units = "1" ;
                NDVI:long_name = "NDVI" ;
                NDVI:_FillValue = -3000 ;
                NDVI:valid_min = -2000 ;
                NDVI:valid_max = 10000 ;
                NDVI:scale_factor = 0.0001 ;
                NDVI:coordinates = "lat lon" ;
                NDVI:grid_mapping = "Albers_Equal_Area" ;
                NDVI:_CoordinateSystems = "projectionCoordSys" ;

// global attributes:
                :Conventions = "CF-1.0" ;
                :title = "Modis NDVI composite data" ;
                :institution = "VirginiaView, Virginia Tech" ;
                :DataType = "GRID" ;
}

____________________
Aaron Dalton 
Computer Science/Mathematics
E-mail: aadalton@xxxxxx
Cell: (540) 815-9828
AIM: adalt0n

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  • Re: NetCDF file won't open.
    • From: Don Murray