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Each DC-style decoder is run with the following syntax:
dcprogram [options] output_file
The available options are described below. Each individual decoder
has it's own set of defaults for these options. For more information
about these defaults, please see the help file for each program
(type "dcmetr -h" for example, at any system prompt), or see the
Decoders Chapter 6 in the GEMPAK Users Manual.
The output file name can be specified using a template. This allows better control of file name creation within the decoders, rather than relying on a name entirely created from the LDM. The template uses the date and time of the bulletin or report to replace the following characters:
YYYY Year with century YY Year without the century MM Month number DD Day HH Hour NN MinuteFor example, YYMMDD_sao.gem
-v N Set the verbosity level to "N". As N goes up, more verbose
logging occurs. The default for all decoders is "0".
-c curtim "curtim" is the pseudo-current time. This is a complete
GEMPAK format date/time (YYMMDD/HHMM) and is used as the
system time when decoding archive data. The default value
for this variable for all decoders is the system time.
-b nhours "nhours" is the number of hours prior to the current time.
Only reports within this time period are decoded into
the data file.
-d decoder_log "decoder_log" is the name and path of the decoder
log file.
-t time_out "time_out" is the time out value in seconds of the
decoder. If no data is received within the specified
time limit, the program will exit. The default time
out value for all decoders is 600 seconds.
-n The default behavior of the decoder is to store the raw
text reports in the decoded data file. Use this flag to
NOT store the raw data.
-h Print the usage statement and exit
-p prmfil Set the parameter packing table to "prmfil". See below
for a description of the GEMPAK parameter packing tables.
-s stntbl Set the station table to "stntbl". See below for a
description of the GEMPAK station tables.
-a iadstn Define the maximum number of additional stations (beyond
those in "prmfil") that can be added to the data file
as "iadstn".
-m maxtim Set the maximum number of times in a single data file
to "maxtim". The maximum times allowable in a single
surface file in NAWIPS 5.6 is 300.
-e NAME=setting Set an environmental variable "NAME" to the value
specified in "setting".
Certain decoder options are useful only with specific decoders.
Also, some decoders may provide additional flags.
Consult the individual decoder help file for which flags are valid
for each decoder.
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