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> Hi Yuan, > I just want to use the derived variable Potential Vorticity to draw > some contour plan view,but It does not word. So just puzzle there is > something wrong or somewhere I don't understand.Please give me some > advice.Thank you! > > Liurui The dataset you loaded is not in the pressure coordinate system, most of the derived variables require pressure domain. You probably need to run the post process of the wrf model output to transfer the dataset before displaying in the IDV. Yuan > > 2011/8/22 Unidata IDV Support <address@hidden> > > > > Full Name: liurui > > > Email Address: address@hidden > > > Organization: university > > > Package Version: 2.9u2 build date:2010-11-22 08:14 UTC > > > Operating System: Windows XP > > > Hardware: Java: home: C:\Program Files\IDV_2.9u2\jre version: 1.6.0_20 > > j3d:1.5.2 fcs (build4) > > > Description of problem: Creating display: Contour Plan View > > > can't create pressure from grid domain > > > org.python.core.PyException > > > > > > ****************** > > > Stack trace: > > > Traceback (innermost last): > > > File "<string>", line 1, in ? > > > at > > ucar.unidata.data.grid.DerivedGridFactory.createPressureGridFromDomain(DerivedGridFactory.java:2274) > > > > > > at > > ucar.unidata.data.grid.DerivedGridFactory.createPotentialTemperature(DerivedGridFactory.java:1896) > > > > > > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > > > > > > at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) > > > > > > at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) > > > > > > at java.lang.reflect.Method.invoke(Unknown Source) > > > > > > > > > visad.VisADException: visad.VisADException: can't create pressure from > > grid domain > > > > > > > > > > > Hi Liurui, > > Due to the sigma coordinate in the wrf model output, some of the > > derived variable may not work. Could you provide more detail information of > > what you were trying to do? > > > > > > Yuan > > > > Ticket Details > > =================== > > Ticket ID: ARK-102346 > > Department: Support IDV > > Priority: Normal > > Status: Closed > > > > > > Ticket Details =================== Ticket ID: ARK-102346 Department: Support IDV Priority: Normal Status: Closed