GEMPAK Manual |
Programs
DCCSIG
DCCSIG decodes convective sigmet and convective outlook reports
from a real-time data feed, or from a file fed to the program
through standard input, and writes the data to an ASCII file. The
program is controlled by inputs to the command line.
The inputs are program options and the output file name or template.
For example, for real-time data feeds:
dccsig [options] output_file
If running the program interactively with standard input, the -c
option must be used. The input file must also be specified.
For example:
dccsig -c YYMMDD/HHNN [other_options] output_file < input_file
A template may be used to specify the output file name. The file
name template uses the date and time of the bulletin or report
to replace the following characters.
YYYY or YY Year with or without the century
MM Month number
DD Day
HH Hour
NN Minute
The format of the output ASCII file is as follows:
|Type|Start_time|End_time|Sequence ID|Intensity|Direction|
Speed|Flt_lvl_1|Flt_lvl_2|Distance|Correction_flag
Lat1 Lon1
Lat2 Lon2
Lat3 Lon3
. .
. .
. .
(Note that the first two lines shown above appear as a single
line in the output file.)
Where: Type is AR (area), LN (line), IS (isolated area),
CS ( nil convective sigmet ), OL (outlook)
Start_time and End_time are full GEMPAK date/time strings
Sequence ID is composed of the sequence number and a region
Intensity is DMSHG (weakening), DSIPTG (ending)
INTSFYG (strengthening), DVLPG (beginning/growing)
Direction is in tens of degrees
Speed is in knots
Flt_lvl_1 and Flt_lvl_2 are the flight levels
Distance is the Distance or Area diameter of the area or line
Correction_flag is a flag indicating a cancellation (0 or 1)
Extra spaces may appear anywhere in this line of information,
except in the first character position. The first character must
be a bar (|).
The latitude and longitude values are read using the FORTRAN
format (2F9.2). The number of points may vary.
Nil convective sigmets and convective outlook reports are decoded and
are indicated in the decoded files by assigning the region id as: '0E',
'0C' or '0W' for both convective sigmets and convective outlooks. Only
convective sigmets use 'CS' as the type identifier to further indicate
a nil issuance for a region. Also, there is no latitude or longitude
information following the decoded nil issuance.