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20031106: Gempak - Linux 9.0 - DCNLDN decoder

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 Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated.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.



Kartik,

the DCNLDN decoder is designed against the data being sent on the IDD
from SUNY-Albany.

If you have ascii data, you can put the data into a text format 
as SFLIST outputs, using latitude and longitude as data,
and thenimport by creating the file with SFCFIL and importing with SFEDIT.

An example of creating a ship format file from ascii text is shown at:
http://www.unidata.ucar.edu/cgi-bin/msgout?/glimpse/gempak/4406

A sample of ascii format for SFEDIT might look like:

 PARM = SLAT;SLON;SGNL;MULT                                                     
 

    STN    YYMMDD/HHMM      SLAT     SLON     SGNL     MULT
      -    031107/2200     24.74   -76.87  -130.00     1.00
      -    031107/2200     25.52   -76.98  -110.00     1.00
      -    031107/2200     25.50   -76.98  -110.00     1.00
      -    031107/2205     24.75   -76.82  -240.00     2.00
      -    031107/2205     24.69   -76.92  -180.00     1.00
      -    031107/2205     24.87   -76.81  -210.00     1.00
      -    031107/2205     25.20   -77.44  -200.00     1.00
      -    031107/2205     24.81   -76.80  -290.00     2.00
      -    031107/2205     25.12   -77.69  -200.00     1.00
      -    031107/2205     24.89   -76.81  -260.00     2.00
      -    031107/2210     25.48   -76.89  -150.00     2.00
      -    031107/2210     25.56   -77.10  -230.00     1.00
      -    031107/2210     25.60   -77.26  -200.00     1.00
      -    031107/2210     24.90   -76.93  -180.00     1.00
      -    031107/2210     24.88   -76.88  -440.00     1.00
      -    031107/2210     25.51   -76.96  -170.00     2.00
      -    031107/2215     24.77   -76.75  -280.00     2.00
      -    031107/2215     25.55   -77.11  -480.00     3.00
      -    031107/2215     24.84   -76.94  -110.00     1.00
      -    031107/2215     25.20   -77.46  -380.00     1.00
      -    031107/2215     24.82   -76.91  -260.00     1.00
      -    031107/2220     24.76   -76.81  -240.00     1.00
      -    031107/2220     24.57   -76.81  -410.00     1.00
      -    031107/2220     24.73   -76.74  -200.00     1.00
      -    031107/2225     24.80   -76.84  -220.00     2.00

Steve Chiswell


>From: "Kartik" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200311070018.hA70Ioh6028420

>Institution: UCF
>Package Version: 5.6
>Operating System: Linux 9.0
>Hardware Information: P4 1.8 GHz
>Inquiry: Hi,
>I'm trying to display nldn data using GARP .
>I understand that the dcnldn decoder converts nldn data to gempak ship format,
>  but I can't seem to get it working...I later found out that the decoder work
> s with binary nldn data and not with the ascii format-which is unforutnately 
> what I have..
>Could somebody please help by letting me know:
>a>If the latest update of the dcnldn decoder works with ascii nldn data?...if 
> so where can I download this decoder?
>b>If there is no ascii version of the decoder how can I adapt the existing dec
> oder to work with ascii data?
>Thanks and regards,
>Kartik
>
>
>