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HOME > Monitoring_and_Data > Oceanic and Atmospheric Data > Reanalysis: Atmospheric Data > wgrib2-tosubmsg
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wgrib2: -tosubmsg
Introduction
The -tosubmsg writes out the current field as a
submessage in a larger grib message. This can save space as various
sections do not have to be repeated. For example, often you only
need one grid definition section for all the submessages. This
feature can save space when the bitmaps are repeated. By combining
the fields into one message, only one copy of the bitmap is needed.
A few codes do not handle submessages
Decoders tend to load the entire grib message into memory.
Loading a 2 GB grib message could be a problem on smaller machines.
Inefficient with "partial-http downloading" (of concern to web servers)
Usage
-tosubmsg OUTPUT_FILE
-1 for the checksum of the entire message
1..8 for the checksum of section N
Example
$ wgrib2 test.grb2 -tosubmsg new.grb2
1:0:d=2008120200:TMP:800 mb:anl:
2:4786:d=2008120200:TMP:750 mb:anl:
3:9572:d=2008120200:RH:800 mb:anl:
4:13335:d=2008120200:RH:750 mb:anl:
5:17098:d=2008120200:TMP:2743 m above mean sea level:anl:
Submessage statistics:
- # submessages written : 5
- Kbytes saved : 0
- Kbytes written : 20
$ wgrib2 new.grb2
1.1:0:d=2008120200:TMP:800 mb:anl:
1.2:0:d=2008120200:TMP:750 mb:anl:
1.3:0:d=2008120200:RH:800 mb:anl:
1.4:0:d=2008120200:RH:750 mb:anl:
1.5:0:d=2008120200:TMP:2743 m above mean sea level:anl:
See also:
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www.nws.noaa.gov 
