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Hi Dan- > Full Name: Dan Harding > Email Address: address@hidden > Organization: fugro geos > Package Version: 2.6b2 build date:2008-12-16 20:59 UTC > Operating System: Windows XP > Hardware: Java: home: H:\IDV\jre version: 1.6.0_07 j3d:1.5.2 fcs (build4) > Description of problem: When trying to load a derived sounding display from a > gfs data set I get the following error (either from temp and rh only or with > true winds) What GFS dataset are you using? From what I can tell, it looks like there is no unit for the temperature. The IDV needs to have a temperature unit for the calculation otherwise it doesn't know if the values are K, Celsius, F or what to do the appropriate conversions. > Creating display: Grid Skew-T > org.python.core.PyException > > ****************** > Stack trace: > Traceback (innermost last): > File "<string>", line 1, in ? > at ucar.visad.Util.vetType(Util.java:259) > > at > ucar.visad.quantities.SaturationVaporPressure.create(SaturationVaporPressure.java:364) > > at > ucar.unidata.data.grid.DerivedGridFactory.makeDewpointFromTAndRH(DerivedGridFactory.java:1412) > > at > ucar.unidata.data.grid.DerivedGridFactory.createDewpoint(DerivedGridFactory.java:1371) > > 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.TypeException: visad.TypeException: MathType of data object > (((lon[unit:degrees_east], lat[unit:degrees_north], lev[unit:millibar]) -> > tmpprs[unit:])) is incompatible with required MathType (Temperature) > > > Ticket Details =================== Ticket ID: XAV-623062 Department: Support IDV Priority: Normal Status: Open