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,…