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20011009: GEMPAK: sfmap, latest obs plot

Christian,

There is no easy way to merge observations from differing
report frequency into a common time.


If you know "a priori" which stations report at 3o minute intervals,
you can run sfmap twice, using the AREA=@stn1;stn2;snt3....
to plot the stations at /xx00 and /xx30 respectively. You would
of course have to consider the station plot density separately
since FILTER will not prevent overlap in those situations.

Steve Chiswell
Unidata User Support




>From: Christian Page <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200110091206.f99C66110383

>
>Hi,
>
>Here is my problem (I coulnd't figure out how to do it nor didn't find any hin
> t
>on previous support questions):
>
>I am already using sfmap to produce surface maps with station plots.
>To illustrate my problem, I plot data valid at each :00 for France. METAR data
>for France is available at :00 and :30. I modified dcmetr to have 30 min bins
>instead of 20 mins by default. It works well.
>But, when I plot data valid at :30, since data at :30 is not available at each
>station, but only a subset, I get many holes.
>My question:
>Is it possible, with GEMPAK, to plot, for all stations in the graphic area, th
> e
>latest data for the last hour?
>So, if one station doesn't report at :30, it would plot the data for that
>particular station valid at :00. But if it reports at :30, it would plot the
>data valid at :30.
>
>Thanks,
>
>Christian Page
>UQAM
>