Struktura pliku netCDF w formacie CDL

(Common Data File)

plik zawiera średni miesięczny geopotencjał na 17 pionowych poziomach w latach 1948-2000

a) header:

netcdf hgt.mon.mean {

dimensions:

·       lon = 144 ;

·       lat = 73 ;

·       level = 17 ;

·       time = UNLIMITED ; // (625 currently)

variables:

·       float level(level) ;

        level:units = "millibar" ;

        level:long_name = "Level" ;

        level:positive = "down" ;

        level:actual_range = 1000.f, 10.f ;

·       float lat(lat) ;

        lat:units = "degrees_north" ;

        lat:actual_range = 90.f, -90.f ;

        lat:long_name = "Latitude" ;

·       float lon(lon) ;

        lon:units = "degrees_east" ;

        lon:long_name = "Longitude" ;

        lon:actual_range = 0.f, 357.5f ;

·       double time(time) ;

        time:units = "hours since 1-1-1

                      00:00:0.0" ;

        time:long_name = "Time" ;

        time:actual_range = 17067072.,17522904.

        time:delta_t = "0000-01-00 00:00:00" ;

        time:avg_period = "0000-01-00 00:00:00"

        time:prev_avg_period = "0000-00-00

                               06:00:00" ;

·       float hgt(time, level, lat, lon) ;

        hgt:long_name = "Monthly Mean of

       Geopotential Height" ;

 

        hgt:actual_range = -295.4193f,

                           32323.77f ;

        hgt:valid_range = -700.f, 35000.f ;

        hgt:units = "m" ;

        hgt:add_offset = 0.f ;

        hgt:scale_factor = 1.f ;

        hgt:missing_value = -9.96921e+36f ;

        hgt:var_desc = "Geopotential height\n",

       hgt:dataset = "CDC Derived NCEP

                    Reanalysis Products\n",

        hgt:level_desc = "Multiple levels\n",

        hgt:statistic = "Mean\n",

 

// global attributes:

  :title = "monthly mean geopotential

    height from the NCEP Reanalysis"

  :history = "Created by NOAA-CIRES

    Climate Diagnostics Center (SAC)

    from the NCEP\n",

    "reanalysis data set on 07/07/97 by

    calc.mon.mean.year.f using\n",

    "/Datasets/nmc.reanalysis.derived/

    pressure/hgt.mon.mean.nc\n",

    "from/Datasets/nmc.reanalysis/pressure

    /hgt.79.nc to hgt.95.nc" ;

  :description = " Data from NCEP

    initialized reanalysis (4x/day). These

    are interpolated to pressure surfaces from

    model (sigma) surfaces." ;

  :platform = "Model" ;

  :Conventions = "COARDS" ;

}

 

b)  sekcja danych:

data:

 level = 1000, 925, 850, 700, 600, 500, 400,  300, 250, 200, 150, 100, 70, 50,  30, 20, 10 ;

 lat = 90, 87.5, 85, 82.5, 80, 77.5, 75,… -90 ;

 lon = 0, 2.5, 5, 7.5, 10, 12.5, 15, 17.5, 20,...357.5;

 time = 17067072, 17067816, 17068512,… 17522904

 hgt=  110.0323,110.0323,110.0323,110.0323,…