Example 4 as CDL file

[nmassey001]

netcdf {

  // Example 4
  // An aggregated data variable whose aggregated data comprises four fragments.
  // Each fragment spans half of the aggregated time dimension, either the
  // northern or southern hemisphere, and the whole of the other two aggregated
  // dimensions. The fragments are stored in external netCDF files. The
  // aggregation definition variables are stored in a child group called
  // aggregation. One of the fragments has been defined by two different
  // external resources (one "local" and one "remote"), each of which is
  // provided with its own address within its file (temp3 and t3 respectively).
  // Either of these resources, but not both, may be used in the aggregated
  // data.

  dimensions:
    // Aggregated dimensions
    time = 12 ;
    level = 1 ;
    latitude = 73 ;
    longitude = 144 ;
  variables:
    // Data variable
    double temp ;
      temp:standard_name = "air_temperature" ;
      temp:units = "K" ;
      temp:cell_methods = "time: mean" ;
      temp:aggregated_dimensions = "time level latitude longitude" ;
      temp:aggregated_data = "location: /aggregation/location
                              file: /aggregation/file
                              format: /aggregation/format
                              address: /aggregation/address" ;
    // Coordinate variables
    double time(time) ;
      time:standard_name = "time" ;
      time:units = "days since 2001-01-01" ;
    double level(level) ;
      level:standard_name = "height_above_mean_sea_level" ;
      level:units = "m" ;
    double latitude(latitude) ;
      latitude:standard_name = "latitude" ;
      latitude:units = "degrees_north" ;
    double longitude(longitude) ;
      longitude:standard_name = "longitude" ;
      longitude:units = "degrees_east" ;

  // global attributes:
    :Conventions = "CF-1.9 CFA-0.6" ;
  data:
    temp = _ ;
    time = 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 ;
    latitude = -90.0, -87.5, -85.0, -82.5, -80.0, -77.5, -75.0, -72.5, -70.0,
               -67.5, -65.0, -62.5, -60.0, -57.5, -55.0, -52.5, -50.0, -47.5,
               -45.0, -42.5, -40.0, -37.5, -35.0, -32.5, -30.0, -27.5, -25.0,
               -22.5, -20.0, -17.5, -15.0, -12.5, -10.0,  -7.5,  -5.0,  -2.5,
                 0.0,   2.5,   5.0,   7.5,  10.0,  12.5,  15.0,  17.5,  20.0,
                22.5,  25.0,  27.5,  30.0,  32.5,  35.0,  37.5,  40.0,  42.5,
                45.0,  47.5,  50.0,  52.5,  55.0,  57.5,  60.0,  62.5,  65.0,
                67.5,  70.0,  72.5,  75.0,  77.5,  80.0,  82.5,  85.0,  87.5,
                90.0;

  group: aggregation {
    dimensions:
      // Fragment dimensions
      f_time = 2 ;
      f_level = 1 ;
      f_latitude = 2 ;
      f_longitude = 1 ;
      // Extra dimensions
      i = 4 ;
      j = 2 ;
      k = 2 ;
    variables:
      // Aggregation definition variables
      int location(i, j) ;
      string file(f_time, f_level, f_latitude, f_longitude, k) ;
      string format ;
      string address(f_time, f_level, f_latitude, f_longitude, k) ;
      // Fragment variable
      double temp2(time, latitude, longitude) ;
        temp2:long_name = "July-December, southern hemisphere" ;
        temp2:units = "degreesC" ;

    data:
      location = 6, 6,
                 1, _,
                 36, 37,
                 144, _ ;
     file = "/remote/January-June_SH.nc", _,
            _, _,
            "/local/January-June_NH.nc", "/remote/January-June_NH.nc",
            "/remote/July-December_NH.nc", _ ;
     format = "nc" ;
     address = "temp1", _,
               "temp2", _,
               "temp3", "t3",
               "temp4", _ ;
     temp2 = 4.5, 3.0, 0.0, -2.6, -5.6, -10.2, _ ;
  }
}