[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

19990513: ACARS decoder query

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: 19990513: ACARS decoder query
  • Date: Thu, 13 May 1999 10:14:31 -0600
Certainly sounds like you have something wrong.

Double check that the acars.pack is in your $GEMTBL/pack directory
and hasn't been changed/munged. It was in the tarfile under the
gempak5.4/tables/pack directory.

I provided a sample acars file in the distribution. You should be able to
run:
cat 9902091400_acars.nc | dcacars -vx -l - YYMMDDHH_acars.gem

This will spew very verbosely, and you should see the initial 
reading in data from the netcdf file like:

        Record xxx tail_number FSLxxxx time 19990209/1454
        Lat 32.366665 Lon -93.900002  Height 10664.342773 Pres 239.888229

After all the netcdf file is read, you will see the write_gempak.c
messages like:
        Station data for FSL00202 : 990209/1408 99020914_acars.gem
           Lat:   17.92 Lon:  -81.13 Elev: 11887.20
           temp -50.30 dwpc -9999.00 relh -9999.00 vacc  0.000

Assuming you are seeing non-zero values for tmpc, then you should have
them in the output file. 

Steve Chiswell
Unidata User SUpport

On Thu, 13 May 1999, Gregory Grosshans wrote:

> Steve,
> 
> I've been decoding the ACARS data manually with the dcacars program and
> the only values that I observe in SFLIST with sfparm=dset are PRES values.
> All other parameters are zeros.  I've looked at an entire hours worth of data
> and the only data that I see is PRES data.
> 
> Am I not doing something correctly?
> 
> Thanks,
> Gregg
>