netcdf demoTomography {

// an example NetCDF CDL file of data specifing a 3D grid in lat-lon-depth 
// with a scalar value "vS" supplied for each grid point.
// time may be used for a 4th dimension if desired, it is single-valued here merely to show syntax
 
dimensions:
        lon = 361 ;
        lat = 181 ;
        depth = 20 ;
        time = UNLIMITED ; // (1 currently)
variables:
   float lat(lat) ;
       lat:long_name = "latitude" ;
       lat:units = "degrees_north" ;
   float lon(lon) ;
       lon:long_name = "longitude" ;
       lon:units = "degrees_east" ;
   float depth(depth) ;
       depth:units = "kilometer" ;
       depth:positive = "down" ;
   int time (time) ; // time is optional 
       time:units = "year" ;
       time:long_name = "year" ;
   float vS(time, depth, lat, lon) ;
        vS:long_name = "Shear wave velocity";
        vS:missing_value = "-9999" ;
        vS:units = "km s-1"
 
data:

 time = 2003 ;
                                                                                           
 vS = 14.22, 14.32, ... ;

 lat = -89.0, -88.0, -87.0, -86.0, -85.0, -84.0 ... ;
 
 lon = 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0, ... ;

 depth = 26.0, 31.0, 36.0, 42.0, 44.0, 47.0, 50.0, ... ;                                                                                          
}