Hello all ,
Please can any one have experience with netcdf data with irregular grid.
my data file is taken from NCEP ADP Global Upper Air and Surface Weather
Observations (PREPBUFR format)
So i need to extract data in a ASCII file like this :
STATION_ID LAT LON OBS_VAL ...
70585 45.5 60.5 1005.5 .....
the header information is :
[hachelaf@skynet1 test]$ ncdump -h gdas.44512.2010040100.nc
netcdf gdas.44512.2010040100 {
dimensions:
mxstr = 16 ;
hdr_arr_len = 3 ;
obs_arr_len = 5 ;
nobs = UNLIMITED ; // (98012 currently)
nhdr = 30766 ;
variables:
char obs_qty(nobs, mxstr) ;
obs_qty:long_name = "quality flag" ;
float obs_arr(nobs, obs_arr_len) ;
obs_arr:long_name = "array of observation values" ;
obs_arr:_fill_value = -9999.f ;
obs_arr:columns = "hdr_id gc lvl hgt ob" ;
obs_arr:hdr_id_long_name = "index of matching header data" ;
obs_arr:gc_long_name = "grib code corresponding to the
observation type" ;
obs_arr:lvl_long_name = "pressure level (hPa) or
accumulation interval (sec)" ;
obs_arr:hgt_long_name = "height in meters above sea level
(msl)" ;
obs_arr:ob_long_name = "observation value" ;
char hdr_typ(nhdr, mxstr) ;
hdr_typ:long_name = "message type" ;
char hdr_sid(nhdr, mxstr) ;
hdr_sid:long_name = "station identification" ;
char hdr_vld(nhdr, mxstr) ;
hdr_vld:long_name = "valid time" ;
hdr_vld:units = "YYYYMMDD_HHMMSS" ;
float hdr_arr(nhdr, hdr_arr_len) ;
hdr_arr:long_name = "array of observation station header
values" ;
hdr_arr:_fill_value = -9999.f ;
hdr_arr:columns = "lat lon elv" ;
hdr_arr:lat_long_name = "latitude" ;
hdr_arr:lat_units = "degrees_north" ;
hdr_arr:lon_long_name = "longitude" ;
hdr_arr:lon_units = "degrees_east" ;
hdr_arr:elv_long_name = "elevation" ;
hdr_arr:elv_units = "meters above sea level (msl)" ;
// global attributes:
:FileOrigins = "File
/glade/p/rda/transfer/dsrqst/RABAH44512/gdas.44512.2010040100.nc generated
20130912_180331 UTC on host geyser01 by the MET pb2nc tool" ;
:MET_version = "V4.1" ;
:MET_tool = "pb2nc"
--
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Cordialement,
Best regards,
Rabah Hachelaf
