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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
>From: weather <address@hidden> >Organization: UCAR/Unidata >Keywords: 200006141936.e5EJarT25468 >I am trying to produce a plot of 10 meter winds from the RUC2 >(I download the GEMPAK file fromm the NCEP server). Why does this >not produce a plot of barbs: > >GEMPAK-GDTHGT>l > GPOINT = 31.7;-95.7 > GDATTIM = f000-f003 > GVCORD = hght > GFUNC = > GVECT = WND > GDFILE = $HDS/00061417_ruc2.gem > PTYPE = lin > TAXIS = > YAXIS = 0/30/10 > BORDER = 1 > LINE = 3 > CINT = 0 > WIND = bk1 > TITLE = 1 > CLEAR = yes > SCALE = 0 > PANEL = 1 > DEVICE = xw > TEXT = 1 > > This works fine if I change gvcord to pres and yaxis to 1000/500/50. > > HGHT is a valid vertical coordinate in this file and it contains 2m > and 10m. If i use gdtser and set gvcord=hght and gfunc=urel, I get > output. > > Any ideas? > > Robert Mullenax > Robert, Although the HGHT coordinate exists for 2m and 10m, U and V are only at 1 single level (10m). Tmpc is on the 2m level. The vector plotting portion of gdthgt uses a method to produce evenly spaced levels on the output plot which requires data on at least 2 levels. So, as a result, your plot will not display wind barbs (unless you use gddiag to create another level with wind data). GDTSER does not attempt to plot multiple levels, so there is not a problem in needing at least 2 levels for display. Steve Chiswell