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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 >