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<DIV>Dear GrADS user forum,</DIV>
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<DIV>I would like to create a time series of wind barbs for a given station. I have 19 stations in my station data file.</DIV>
<DIV>How do I tell GrADS which station I want? This would be similar to setting x and Y to a specific point on a gridded</DIV>
<DIV>dataset. From the website I gleaned the following:</DIV>
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<DIV> 'open station-9mar2011.ctl'</DIV>
<DIV> 'set t 1 15'</DIV>
<DIV> 'set gxout tserbarb'</DIV>
<DIV> 'd u(stid=Agricola);v(stid=Agricola)'</DIV>
<DIV> </DIV>
<DIV>But it responds with the following error:</DIV>
<DIV><BR>Data Request Error: Invalid dimension expression<BR> Attempt to set or modify varying dimension<BR> Variable = u, Dimension = 11<BR> Error ocurred at column 1<BR>DISPLAY error: Invalid expression<BR> Expression = u(stid=agricola)<BR></DIV>
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<DIV>Here is the content of my control file:</DIV>
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<DIV> dset station-9mar2011.dat<BR> dtype station<BR> stnmap station-9mar2011.map<BR> undef 9999.0<BR> title 9 March 2011<BR> tdef 96 linear 00:00Z09mar2011 15mn<BR> vars 5<BR> t 0 99 temperature<BR> td 0 99 dew point temperature<BR> p 0 99 sea level pressure<BR> u 0 99 zonal wind<BR> v 0 99 meridional wind<BR> endvars<BR></DIV>
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<DIV>Any ideas would be welcome.</DIV>
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<DIV>Thank you in advance,</DIV>
<DIV>Sytske Kimball</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Sytske (seets-kah) Kimball<BR>Professor of Meteorology</DIV>
<DIV>Director, South Alabama Mesonet<BR>Dept. of Earth Sciences<BR>University of South Alabama<BR>Mobile, AL<BR>phone (251) 460-7031 </DIV>
<DIV>fax (251) 460-7886<BR>email <A href="mailto:skimball@usouthal.edu">skimball@usouthal.edu</A></DIV>
<DIV>web: <A href="http://chiliweb.southalabama.edu/">http://chiliweb.southalabama.edu/</A></DIV></BODY></HTML>