netcdf aggregations/g/ds628.0/30/TwoD {
  dimensions:
    lon = 288;
    lat = 145;
    reftime = 95201;
    timeOffset = 2;
  variables:
    int LatLon_Projection;
      :grid_mapping_name = "latitude_longitude";
      :earth_radius = 6367470.0; // double
      :_CoordinateTransformType = "Projection";
      :_CoordinateAxisTypes = "Lat Lon";

    float Ice_cover_surface(reftime=95201, timeOffset=2, lat=145, lon=288);
      :long_name = "Ice cover @ Ground or water surface";
      :units = "fraction";
      :description = "Ice cover";
      :missing_value = NaNf; // float
      :grid_mapping = "LatLon_Projection";
      :coordinates = "reftime time timeOffset lat lon ";
      :Grib_Variable_Id = "VAR_34-241-200-91_L1";
      :Grib1_Center = 34; // int
      :Grib1_Subcenter = 241; // int
      :Grib1_TableVersion = 200; // int
      :Grib1_Parameter = 91; // int
      :Grib1_Parameter_Name = "ICE_C";
      :Grib1_Level_Type = 1; // int
      :Grib1_Level_Desc = "Ground or water surface";
      :Grib1_Interval_Type = -1; // int
      :Grib1_Interval_Name = "Unknown Time Range Indicator -1";

    float lat(lat=145);
      :units = "degrees_north";
      :_CoordinateAxisType = "Lat";

    float lon(lon=288);
      :units = "degrees_east";
      :_CoordinateAxisType = "Lon";

    double reftime(reftime=95201);
      :units = "Hour since 1957-12-31T18:00:00Z";
      :standard_name = "forecast_reference_time";
      :long_name = "GRIB reference time";
      :calendar = "proleptic_gregorian";
      :_CoordinateAxisType = "RunTime";

    double timeOffset(timeOffset=2);
      :_CoordinateAxisType = "TimeOffset";
      :units = "Hour";
      :standard_name = "forecast_period";
      :long_name = "time offset from runtime";
      :udunits = "Hour since 1957-12-31T18:00:00Z";

    double time(reftime=95201, timeOffset=2);
      :units = "Hour since 1957-12-31T18:00:00Z";
      :standard_name = "time";
      :long_name = "GRIB forecast or observation time";
      :calendar = "proleptic_gregorian";
      :_CoordinateAxisType = "Time";

  // global attributes:
  :Originating_or_generating_Center = "Tokyo (RSMC), Japan Meteorological Agency";
  :Originating_or_generating_Subcenter = "Reanalysis project";
  :GRIB_table_version = "0,200";
  :Generating_process_or_model = "Japanese 55-year Reanalysis (JRA-55)";
  :file_format = "GRIB-1";
  :Conventions = "CF-1.6";
  :history = "Read using CDM IOSP GribCollection v3";
  :featureType = "GRID";
  :_CoordSysBuilder = "ucar.nc2.dataset.conv.CF1Convention";
}