Recipe: Read file metadata: Difference between revisions
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== Solution == | == Solution == | ||
For the purpose of this example, we assume that we have already downloaded the file c1440_NR.inst01hr_3d_T_Cv.20060918_0900z.nc4 from the ftp server. For more information about file naming conventions, and how to download a file from the ftp server, please follow the links in the #See Also section. | For the purpose of this example, we assume that we have already downloaded the file c1440_NR.inst01hr_3d_T_Cv.20060918_0900z.nc4 from the ftp server. For more information about file naming conventions, and how to download a file from the ftp server, please follow the links in the [[#See Also]] section. | ||
The easiest way to read | The easiest way to read metadata of a G5NR data file is to use the utility <code>ncdump</code> that comes with the NetCDF-4 installation. | ||
For header information only (no data), one can issue the command | |||
> ncdump -h c1440_NR.inst01hr_3d_T_Cv.20060918_0900z.nc4 | |||
resulting in | |||
<nowiki> | |||
netcdf c1440_NR.inst01hr_3d_T_Cv.20060918_0900z { | |||
dimensions: | |||
lon = 720 ; | |||
lat = 361 ; | |||
lev = 72 ; | |||
time = UNLIMITED ; // (1 currently) | |||
variables: | |||
double lon(lon) ; | |||
lon:long_name = "longitude" ; | |||
lon:units = "degrees_east" ; | |||
double lat(lat) ; | |||
lat:long_name = "latitude" ; | |||
lat:units = "degrees_north" ; | |||
double lev(lev) ; | |||
lev:long_name = "vertical level" ; | |||
lev:units = "layer" ; | |||
lev:positive = "down" ; | |||
lev:coordinate = "eta" ; | |||
lev:standard_name = "model_layers" ; | |||
int time(time) ; | |||
time:long_name = "time" ; | |||
time:units = "minutes since 2006-09-18 09:00:00" ; | |||
time:time_increment = 10000 ; | |||
time:begin_date = 20060918 ; | |||
time:begin_time = 90000 ; | |||
float T(time, lev, lat, lon) ; | |||
T:long_name = "air_temperature" ; | |||
T:units = "K" ; | |||
T:_FillValue = 1.e+15f ; | |||
T:missing_value = 1.e+15f ; | |||
T:fmissing_value = 1.e+15f ; | |||
T:scale_factor = 1.f ; | |||
T:add_offset = 0.f ; | |||
T:standard_name = "air_temperature" ; | |||
T:vmin = -1.e+15f ; | |||
T:vmax = 1.e+15f ; | |||
T:valid_range = -1.e+15f, 1.e+15f ; | |||
// global attributes: | |||
:History = "File written by MAPL_CFIO" ; | |||
:Source = "wmp-Ganymed-4_0_BETA8" ; | |||
:Title = "3d,1-Hourly,Instantaneous,Model-Level,Coarsened to 1/2 degree,Air Temperature" ; | |||
:Contact = "http://gmao.gsfc.nasa.gov" ; | |||
:Conventions = "COARDS" ; | |||
:Institution = "NASA Global Modeling and Assimilation Office" ; | |||
:References = "http://gmao.gsfc.nasa.gov" ; | |||
:Comment = "7-km_Non-Hydrostatic_Nature_Run" ; | |||
} | |||
</nowiki> | |||
== Discussions == | == Discussions == | ||