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20010501: How to get netcdf text info
- Subject: 20010501: How to get netcdf text info
- Date: Tue, 01 May 2001 23:07:16 -0600
Celia,
The dcacars decoder in GEMPAK extracts these airport ID fields.
You may want to look at that code in
$NAWIPS/unidata/ldmbridge/dcacars/decode_ncacars.c
since it is already written.
Here is the relevant code section, the aid_len and rpt_len come
from dimention inquiries of the attributes:
memset(orig,'\0',sizeof(orig));
memset(dest,'\0',sizeof(dest));
vc[1] = aid_len;
ier = nc_get_vara_text(cdfid,orig_id,var_i,vc,orig);
ier = nc_get_vara_text(cdfid,dest_id,var_i,vc,dest);
memset(rptsta,'\0',sizeof(rptsta));
vc[1] = rpt_len;
ier = nc_get_vara_text(cdfid,rpt_id,var_i,vc,rptsta);
Steve Chiswell
Unidata User Support
>From: Celia Chen <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200105012302.f41N2Bp29284
>
>I need some help getting text formatted data off an netcdf file
>(see the attached header). For example, I would like to get
>rptStation, origAirport, and destAirport and store them in
>arrays. I have tried nc_get_var_text without success -
>I was getting seg fault error at run time.
>
>Please advise.
>
>Celia
>
>
>======================
>netcdf 20011211540 {
>dimensions:
> recNum = UNLIMITED ; // (3367 currently)
> enLen = 12 ;
> rptStationLen = 4 ;
> AirportIdLen = 6 ;
> dateLen = 30 ;
>variables:
> int missingInputMinutes ;
> missingInputMinutes:long_name = "missing minutes of input data"
> ;
> missingInputMinutes:units = "minutes" ;
> char minDate(dateLen) ;
> minDate:long_name = "minimum observation date" ;
> minDate:units = "human-readable min date/time" ;
> char maxDate(dateLen) ;
> maxDate:long_name = "maximum observation date" ;
> maxDate:units = "human-readable max date/time" ;
> double minSecs ;
> minSecs:long_name = "minimum observation time" ;
> minSecs:units = "seconds since 1970-1-1 00:00:00" ;
> double maxSecs ;
> maxSecs:long_name = "maximum observation time" ;
> maxSecs:units = "seconds since 1970-1-1 00:00:00" ;
> float latitude(recNum) ;
> latitude:units = "degree_N" ;
> latitude:valid_range = 0.f, 90.f ;
> latitude:_FillValue = 99999.f ;
> float longitude(recNum) ;
> longitude:units = "degree_E" ;
> longitude:valid_range = -180.f, 180.f ;
> longitude:_FillValue = 99999.f ;
> float altitude(recNum) ;
> altitude:units = "meter (pressure altitude, msl)" ;
> altitude:_FillValue = 99999.f ;
> altitude:valid_min = -100.f ;
> double timeObs(recNum) ;
> timeObs:long_name = "time of observation" ;
> timeObs:units = "seconds since 1970-1-1 00:00:00" ;
> timeObs:_FillValue = 0. ;
> float temperature(recNum) ;
> temperature:units = "Kelvin" ;
> temperature:_FillValue = 99999.f ;
> float windDir(recNum) ;
> windDir:long_name = "Wind Direction" ;
> windDir:units = "degree_true" ;
> windDir:_FillValue = 99999.f ;
> windDir:valid_range = 0.f, 359.99f ;
> float windSpeed(recNum) ;
> windSpeed:long_name = "Wind Speed" ;
> windSpeed:units = "meter/sec" ;
> windSpeed:_FillValue = 99999.f ;
> windSpeed:valid_min = 0.f ;
> float heading(recNum) ;
> heading:long_name = "heading of flight path over ground" ;
> heading:units = "degree_true" ;
> heading:_FillValue = 99999.f ;
> heading:valid_range = 0.f, 359.99f ;
> float mach(recNum) ;
> mach:long_name = "mach number (0-1)" ;
> float waterVaporMR(recNum) ;
> waterVaporMR:long_name = "downlinked water vapor mixing ratio"
> ;
> waterVaporMR:units = "none" ;
> waterVaporMR:_FillValue = -1.f ;
> float correctedWVMR(recNum) ;
> correctedWVMR:long_name = "corrected water vapor mixing ratio"
> ;
> correctedWVMR:units = "none" ;
> correctedWVMR:_FillValue = -1.f ;
> float downlinkedRH(recNum) ;
> downlinkedRH:long_name = "downlinked relative humidity" ;
> downlinkedRH:units = "none" ;
> downlinkedRH:_FillValue = -1.f ;
> float dewpoint(recNum) ;
> dewpoint:long_name = "Dew Point (Kelvin)" ;
> dewpoint:units = "Kelvin" ;
> dewpoint:_FillValue = 99999.f ;
> float rh_probe(recNum) ;
> rh_probe:long_name = "RH in probe (0-1), w/ Vaisala correction
> un-done" ;
> rh_probe:_FillValue = 0.f ;
> float medTurbulence(recNum) ;
> medTurbulence:long_name = "Median eddy dissipation rate" ;
> medTurbulence:units = "m^(2/3) s^-1" ;
> medTurbulence:_FillValue = -9.99f ;
> float maxTurbulence(recNum) ;
> maxTurbulence:long_name = "Maximum eddy dissipation rate" ;
> maxTurbulence:units = "m^(2/3) s^-1" ;
> maxTurbulence:_FillValue = -9.99f ;
> float vertAccel(recNum) ;
> vertAccel:long_name = "peak vertical acceleration" ;
> vertAccel:units = "meters/sec/sec" ;
> vertAccel:valid_range = -99.9, 99.9 ;
> vertAccel:_FillValue = 99999.f ;
> float vertGust(recNum) ;
> vertGust:long_name = "peak vertical gust" ;
> vertGust:units = "meters/sec" ;
> vertGust:_FillValue = 99999.f ;
> char en_tailNumber(recNum, enLen) ;
> en_tailNumber:long_name = "FSL-encrypted tail number" ;
> byte dataDescriptor(recNum) ;
> dataDescriptor:long_name = "AWIPS-type data descriptor" ;
> dataDescriptor:units = " good= R or T , bad= X" ;
> byte errorType(recNum) ;
> errorType:units = " temp=T, wind=W, both=B " ;
> byte rollFlag(recNum) ;
> rollFlag:long_name = "Aircraft roll angle flag " ;
> rollFlag:units = " G = < 5 degrees, B = > 5 degrees" ;
> byte waterVaporQC(recNum) ;
> waterVaporQC:long_name = "water vapor mixing ratio QC character
> " ;
> waterVaporQC:value_0 = "Normal, Ground speed > 60 knots." ;
> waterVaporQC:value_1 = "Normal, nonmeasurement mode, Ground spe
> ed < 60 knots" ;
> waterVaporQC:value_2 = "Small RH, RH measured is < 1.5%;RH set
> to 1.5%" ;
> waterVaporQC:value_3 = "Humidity element wet. RH = 5.0v for < 1
> 20s" ;
> waterVaporQC:value_4 = "Element contatminated. RH=5v for>120s"
> ;
> waterVaporQC:value_5 = "Heater fail" ;
> waterVaporQC:value_6 = "Heater fail and wet/contatminated eleme
> nt" ;
> waterVaporQC:value_7 = "1 or more inputs invalid" ;
> waterVaporQC:value_8 = "Numeric error" ;
> waterVaporQC:value_9 = "Dew point greater than temperature" ;
> byte interpolatedTime(recNum) ;
> interpolatedTime:long_name = "UPS ascent/descent time interpola
> tion indicator" ;
> interpolatedTime:units = "r for raw data, i for interpolated" ;
> byte interpolatedLL(recNum) ;
> interpolatedLL:long_name = "UPS ascent/descent lat&lon interpol
> ation indicator" ;
> interpolatedLL:units = "r for raw data, i for interpolated" ;
> byte tempError(recNum) ;
> tempError:units = "good= p ,bad= W or C ,unknown= -" ;
> byte windDirError(recNum) ;
> windDirError:units = " good= p ,bad= B ,unknown= -" ;
> byte windSpeedError(recNum) ;
> windSpeedError:units = " good= p ,bad= F or S ,unknown= -" ;
> byte speedError(recNum) ;
> speedError:long_name = "Aircraft ground speed error" ;
> speedError:units = " good= p ,bad= F or S ,unknown= -" ;
> byte bounceError(recNum) ;
> bounceError:long_name = "Aircraft altitude variance error" ;
> bounceError:units = "good= p ,bad= H or L ,unknown= -" ;
> byte correctedFlag(recNum) ;
> correctedFlag:long_name = "Corrected data indicator" ;
> correctedFlag:units = "r,l,T,f,or t" ;
> correctedFlag:value_r = "raw data" ;
> correctedFlag:value_l = "lat/lon correction (other than interpo
> lation)" ;
> correctedFlag:value_T = "temperature correction" ;
> correctedFlag:value_f = "longitude and wind direction flipped"
> ;
> correctedFlag:value_t = "obs time has been set to the report re
> ceipt time" ;
> char rptStation(recNum, rptStationLen) ;
> rptStation:long_name = "Station reporting through" ;
> rptStation:_FillValue = " " ;
> double timeReceived(recNum) ;
> timeReceived:long_name = "time data was received at ground stat
> ion" ;
> timeReceived:units = "seconds since 1970-1-1 00:00:00" ;
> timeReceived:_FillValue = 0. ;
> char origAirport(recNum, AirportIdLen) ;
> origAirport:long_name = "Originating Airport" ;
> origAirport:valueUNKN = " " ;
> origAirport:FillValue = " " ;
> char destAirport(recNum, AirportIdLen) ;
> destAirport:long_name = "Destination Airport" ;
> destAirport:valueUNKN = " " ;
> destAirport:FillValue = " " ;
>
>// global attributes:
> :title = "ACARS data, encrypted tail numbers" ;
> :reference = "FSL encrypted ACARS, 14-Nov-2000" ;
> :version = "2.6" ;
>data:
>
> missingInputMinutes = 0 ;
>
> minDate = "Tue 01-May-2001 1440:00 UTC" ;
>
> maxDate = "Tue 01-May-2001 1534:43 UTC" ;
>
> minSecs = 988728000 ;
>
> maxSecs = 988731283 ;
>
> latitude = -6.233333, -7.083333, 52.55, 52.55, 52.55, 52.56667, 52.56667,
>--
>Celia Chen
>RAP/NCAR
>
>"Nothing is as strong as gentleness or as gentle as strength."
> - Dove Milk Promises
>
>
