netcdf IDV_sample_track_data_cdl_file {

// comments:
// sample IDV track data file for seismic ray path data; a simple track, or path; not parameterized.
// There are 30 point data locations in this exmaple.
// IDV track data files are NetCDF and must have time values as well as lat,lon and 
// "altitude" (depth); the depth values' variable must be named "altitude." 
// Time values increase monotoically. Note time units.
// Raypath cdl files should end in .cdl as a simple reminder; the equivalent "nc" file
// must end in "p3.nc" for the IDV to automatically recognize this as track data. 

dimensions: 
         time = UNLIMITED ;
variables: 
   float latitude(time) ; 
       latitude:long_name = "latitude" ;
       latitude:units = "degrees_N" ;
   float longitude(time) ; 
       longitude:long_name = "longitude" ;
       longitude:units = "degrees_E" ;
   float altitude(time) ; 
       altitude:units = "km" ;
       altitude:long_name = "depth below surface" ;
   double time (time) ; 
       time:units = "seconds since 2005-11-18 0:00:00 0:00" ;
       time:long_name = "travel time along path" ;

data:

 longitude = 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0, 180.0 ;

 latitude = 52.0,   51.0000,   50.0000,   49.0000,   48.0000,   47.0000,   46.0000,   45.0000,   44.0000,   43.0000,   42.0000,   41.0000,   40.0000,   39.0000,   38.0000,   37.0000,   36.0000,   35.0000,   34.0000,   33.0000,   32.0000,   31.0000,   30.0000,   29.0000,   28.0000,   27.0000,   26.0000,   25.0000,   24.0000,   23.0000,   22.0000 ;

 altitude = 0.0, -294.2748826, -429.5439284, -534.1515393, -621.2930550, -695.9975108, -760.7543790, -816.9682454, -865.4950452, -906.8822224, -941.4906935, -969.5624187, -991.2601860, -1006.6919614, -1015.9260020, -1019.0000000, -1015.9260020, -1006.6919614, -991.2601860, -969.5624187, -941.4906935, -906.8822224, -865.4950452, -816.9682454, -760.7543790, -695.9975108, -621.2930550, -534.1515393, -429.5439284, -294.2748826,   -0.0000042 ;

 time = 0.0,  11.000,  22.000,  33.000,  44.000,  55.000,  66.000,  77.000,  88.000,  99.000, 110.000, 121.000, 132.000, 143.000, 154.000, 165.000, 176.000, 187.000, 198.000, 209.000, 220.000, 231.000, 242.000, 253.000, 264.000, 275.000, 286.000, 297.000, 308.000, 319.000, 330.000 ;

}