Dear NetCDF suppot team
Hello
I am DH from Korea.
I am going to use netcdf file soon to get the weather information at my company.
But the problem is I am the first one in my company so don't know how to
interpret the nc file.
(I can just convert to txt file with ncdump, and read the letters...)
below is the netcdf file which I should interpret...(it contains global wind
information)
========================================================================================
netcdf GFS20150520 {
dimensions:
lon = 720 ;
lat = 361 ;
time = UNLIMITED ; // (57 currently)
variables:
float lat(lat) ;
lat:long_name = "Latitude" ;
lat:units = "degrees_north" ;
lat:missing_value = -99999.f ;
lat:_FillValue = -99999.f ;
float lon(lon) ;
lon:long_name = "Longitude" ;
lon:units = "degrees_east" ;
lon:missing_value = -99999.f ;
lon:_FillValue = -99999.f ;
int time(time) ;
time:long_name = "forecast time" ;
time:units = "minutes since 2015-05-20 00:00" ;
time:standard_name = "time" ;
time:reference = "UTC" ;
time:missing_value = -99999 ;
time:_FillValue = -99999 ;
short Wind_U(time, lat, lon) ;
Wind_U:long_name = "Wind U Component" ;
Wind_U:units = "m/s" ;
Wind_U:scale_factor = 0.01f ;
Wind_U:valid_range = -100s, 100s ;
Wind_U:missing_value = -9999s ;
Wind_U:_FillValue = -9999s ;
Wind_U:coordinate = "lon lat" ;
short Wind_V(time, lat, lon) ;
Wind_V:long_name = "Wind V Component" ;
Wind_V:units = "m/s" ;
Wind_V:scale_factor = 0.01f ;
Wind_V:valid_range = -100s, 100s ;
Wind_V:missing_value = -9999s ;
Wind_V:_FillValue = -9999s ;
Wind_V:coordinate = "lon lat" ;
// global attributes:
:title = "Environmental data" ;
:version = "1.0" ;
:institution = "ASA" ;
:Contact = "asa@xxxxxxxxxx" ;
:source = "NCEP NOAA" ;
:reference = "Created by DAN_GRIB2NC2 Version 3.0d at 05/20/15 18:14:53" ;
:default_view = "10 meter Wind U, Wind V " ;
:netcdf_class = "2" ;
:netcdf_class_description = "Multi point, static, ..." ;
:time_var = "time" ;
:lat_var = "Lat" ;
:lon_var = "lon" ;
:view_style = "1" ;
:Conventions = "CF-1.0" ;
data:
lat = -90, -89.5, -89, -88.5, -88, -87.5, -87, -86.5, -86, -85.5, -85,
-84.5, -84, -83.5, -83, -82.5, -82, -81.5, -81, -80.5, -80, -79.5, -79,
-78.5, -78, -77.5, -77, -76.5, -76, -75.5, -75, -74.5, -74, -73.5, -73,
.....(oimt).....
lon = 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8,
8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5,
16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20, 20.5, 21, 21.5, 22, 22.5, 23,
23.5, 24, 24.5, 25, 25.5, 26, 26.5, 27, 27.5, 28, 28.5, 29, 29.5, 30,
.....(oimt).....
time = 0, 180, 360, 540, 720, 900, 1080, 1260, 1440, 1620, 1800, 1980, 2160,
2340, 2520, 2700, 2880, 3060, 3240, 3420, 3600, 3780, 3960, 4140, 4320,
4500, 4680, 4860, 5040, 5220, 5400, 5580, 5760, 5940, 6120, 6300, 6480,
6660, 6840, 7020, 7200, 7380, 7560, 7740, 7920, 8100, 8280, 8460, 8640,
8820, 9000, 9180, 9360, 9540, 9720, 9900, 10080 ;
Wind_U =
155, 158, 161, 164, 166, 168, 171, 175, 177, 179, 182, 184, 188, 190, 192,
194, 197, 200, 203, 204, 207, 209, 212, 214, 216, 220, 222, 224, 227,
229, 230, 233, 235, 237, 239, 241, 245, 247, 249, 251, 253, 255, 256,
.....(oimt).....
Wind_V =
-310, -309, -308, -307, -306, -304, -303, -301, -300, -298, -297, -295,
-292, -291, -289, -287, -286, -284, -282, -281, -280, -278, -276, -274,
-272, -270, -267, -265, -263, -262, -259, -257, -256, -254, -252, -250,
-248, -246, -244, -241, -238, -236, -234, -232, -230, -228, -226, -223,
.....(oimt)
========================================================================================
For example, at the above file, the first value of Wind_U, 155 is simply
meaning Wind_U(time, lat, lon)=Wind_U(0, -90, 0) ?
Then what about the second value of Wind_U, 158 ? Is that meaning Wind_U(0,
-90, 0.5) ? or Wind_U(180, -90, 0) ?
I am not sure this is right and I don't know about the order...
Please reply me with brief explanation.
Thank you for reading.
Best Regards
DH HAN
