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HOME > Monitoring_and_Data > Oceanic and Atmospheric Data > Reanalysis: Atmospheric Data > wgrib2 -set_ftime

wgrib2: -set_ftime


Changing the time stamp is more complicated than necessary. Depending on the type of time stamp, the options needed differ, and the options have some arbitary limitions. It's all on how wgrib2 evolved. Originally there was PDT 4.0 and -set_ftime and -set_ave were written to modify the time stamp. Next came an option to support PDT 4.8, -set_ave. The -set_ave option allowed conversion of PDT 4.0 to 4.8.

Original: :d=2014113018:6 hour fcst:
New:      :d=2014122500:12 hour fcst:
   options: -set_date 2014122500 -set_ftime "12 hour fcst"

Original: :d=2014113018:6 hour fcst:
New:      :d=2014122500:0-6 hour ave fcst:
   options: -set_date 2014122500 -set_ave "0-6 hour ave fcst"

Original: :d=2014113018:6 hour fcst:
New:      :d=2014122500:124@6 hour ave(0-6 hour ave fcst),missing=0:
   options: -set_date 2014122500 -set_ave "124@6 hour ave(0-6 hour ave fcst),missing=0"
The options, -set_ave and -set_ftime may have to convert between PDTs. Only a subset of the conversions are supported.

It was noted that the old ftime had problems with the more complicated time stamps and ftime2 was developed to be an eventual replacement. Similarily set_ftime2 was developed to replace the old set_ftime/set_ave options.

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Page last modified: May 15, 2005
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