Re: 20051130: Please Help about metar2nc

• To: "DEROGNAT, Claude" <cderognat@xxxxxxx>
• Subject: Re: 20051130: Please Help about metar2nc
• From: Robb Kambic <rkambic@xxxxxxxxxxxxxxxx>
• Date: Thu, 1 Dec 2005 13:11:42 -0700 (MST)

On Wed, 30 Nov 2005, Unidata Support wrote:

> >To: "'support@xxxxxxxxxxxxxxxx'" <support@xxxxxxxxxxxxxxxx>
> >From: "DEROGNAT, Claude" <cderognat@xxxxxxx>
> >Subject: Please Help about metar2nc
> >Organization: ?
> >Keywords: 200511301759.jAUHxP7s021255
>
> Dear,
>
> I already sent you an e-mail yesterday but I forgot to told you
> that my metar files came from the NOAA. they are downloaded
> from ftp://weather.noaa.gov/data/observations/metar/cycles.

Claude,

the files from ftp://weather.noaa.gov/data/observations/metar/cycles
are not in the correct format, they need to be in the wmo text format that
looks like:

^A^M
443 ^M
SAMX45 MMMY 011900^M
METAR^M
MMMY 011900Z 00000KT 6SM HZ SKC 21/19 A2989=^M

^M
^C

we have a data server at:

http://motherlode.ucar.edu/cgi-bin/ldm/genweb?native/nwstg/text

where you can get the data in the correct format. it has a passwd of
lotzodata  please do not abuise this site our you will be restricted.

i answered your other question below.



>
> regards,
>
> claude
>
> PS: I also tried to use other soffwares of the tool box and I obtain
> the same result.
>
> >  -----Message d'origine-----
> > De :        DEROGNAT, Claude
> > Envoyé :    mardi 29 novembre 2005 15:44
> > À : 'support@xxxxxxxxxxxxxxxx'
> > Objet :
> >
> > Dear,
> >
> > I am working on the use Unidata decoder (4.0.0) to decode metar data on
> > the Linux (DEBIAN)
> > I have installed netcdf, perl, netcdf-perl, idunits and decoder.
> > Everything seems ok.
> > However, when I use metar2nc to decode the testdata.wmo.bak or my data
> > file, all I got is
> > a simple error message:
> >
> > eof on STDIN --shutting down.
> >
> > I found on a previous e-mail (20041207) stored on
> > www.unidat.ucar.edu/packages/decoders
> > that the Unidata decoder only decodes data less than 24 hr.
> > I tried to add # at the beginning of line 282 - 291 and 348-371 but I
> > obtained the same result.
> > I attached the metar file used (.gz). Could you please let me know the
> > possible reasons?
> > Is-it possible that my set of metar file is not for this decoder?
> >
> > best regards,
> >
> > Claude Derognat
> >
> > << Fichier: 2005112207.metar.gz>><< Fichier: testdata.wmo.bak.gz>>
> >
> > PS: the command used is:
> > metar2nc metar.cdl < testdata.wmo.bak
> >

since the decoder is sensitive to date information, the testdata.wmo.bak
file has a place holder called "DATE" that is replaced with the current
date before the metar2nc decoder runs. this is done automatically if you
run the decoders make command.

% make test

the output should look similar:

laraine.unidata.ucar.edu.rkambic> make test

making `test' in directory /home/rkambic/code/decoders/src/gribtonc

*** gribdump -b ... OK
*** gribdump -v ... OK
*** gribdump -q ... OK

returning to directory /home/rkambic/code/decoders/src

perl test.pl

   perl Decoders tests takes > 30 seconds in batch mode

METAR tested ...... OK
ascii tested ...... OK
ldmConnect tested . OK
METAR tested ...... OK
syn tested ........ OK
buoy tested ....... OK
upperair tested ... OK


robb...

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==============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
rkambic@xxxxxxxxxxxxxxxx                   WWW: http://www.unidata.ucar.edu/
==============================================================================