[IDV #IKS-460506]: problem w/ theta-e calculation in IDV

["Unidata IDV Support" <support-idv@xxxxxxxxxxxxxxxx>]

Hi Darren-

> Full Name: Darren Van Cleave
> Email Address: VanCleave@xxxxxxxxxxxxxxxxxx
> Organization: Colorado State University / CIRA
> Package Version: 2.5 build date:2008-05-08 07:05 UTC
> Operating System: Windows XP
> Hardware: Java: home: C:\Program Files\IDV_2.5\jre version: 1.5.0_11 j3d:1.3.2 fcs (build12)
> Description of problem: When I was trying to use the Equiv. Poten. Temp. built-in function with NARR-A grib files in IDV, I got the following error message:
> (running IDV v. 2.5 on WinXP, I was trying to make a contour plan view)
> 
> Creating display: Contour Plan View
> Attempt to convert from unit "Pa" to unit "m"

In most of the realtime models, the Relative Humidity field used in
this calculation is the 3D isobaric field.   However, in this grid,
there is no isobaric RH field.

The problem is that the RH field the built-in formula is trying to use
is the 2D field Relative Humidity @ height above ground which has a
vertical dimension of meters, thus the error.  It's expecting Pa (or
something convertible with that).

I don't have a good solution for this at the present.  We are still
in the process of developing our diagnostic library and I'll look
at computing this from the parameters available.  But I don't have
a timeline for that.

Don Murray

> visad.UnitException: Attempt to convert from unit "Pa" to unit "m"
> at visad.DerivedUnit.toThis(DerivedUnit.java:897)
> at visad.DerivedUnit.toThis(DerivedUnit.java:799)
> at visad.DerivedUnit.toThis(DerivedUnit.java:761)
> at visad.ScaledUnit.toThat(ScaledUnit.java:496)
> at visad.BaseUnit.toThis(BaseUnit.java:539)
> at visad.Unit.toThis(Unit.java:807)
> at visad.Real.getValue(Real.java:289)
> at ucar.unidata.data.grid.GeoGridDataSource.indexOf(GeoGridDataSource.java:1333)
> at ucar.unidata.data.grid.GeoGridDataSource.makeFieldImpl(GeoGridDataSource.java:1375)
> at ucar.unidata.data.grid.GeoGridDataSource.getDataInner(GeoGridDataSource.java:1144)
> at ucar.unidata.data.DataSourceImpl.getData(DataSourceImpl.java:2063)
> at ucar.unidata.data.DirectDataChoice.getData(DirectDataChoice.java:333)
> at ucar.unidata.data.DerivedDataChoice.setData(DerivedDataChoice.java:610)
> at ucar.unidata.data.DerivedDataChoice.collectOperands(DerivedDataChoice.java:537)
> at ucar.unidata.data.DerivedDataChoice.getData(DerivedDataChoice.java:709)
> at ucar.unidata.data.DataChoice.getData(DataChoice.java:620)
> at ucar.unidata.data.DataInstance.getData(DataInstance.java:239)
> at ucar.unidata.data.DataInstance.getData(DataInstance.java:203)
> at ucar.unidata.data.grid.GridDataInstance.init(GridDataInstance.java:204)
> at ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:161)
> at ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:142)
> at ucar.unidata.idv.control.PlanViewControl.doMakeDataInstance(PlanViewControl.java:1172)
> at ucar.unidata.idv.control.DisplayControlImpl.initializeDataInstance(DisplayControlImpl.java:2903)
> at ucar.unidata.idv.control.DisplayControlImpl.setData(DisplayControlImpl.java:2885)
> at ucar.unidata.idv.control.PlanViewControl.setData(PlanViewControl.java:489)
> at ucar.unidata.idv.control.ContourPlanViewControl.setData(ContourPlanViewControl.java:115)
> at ucar.unidata.idv.control.PlanViewControl.init(PlanViewControl.java:398)
> at ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1257)
> at ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:968)
> at ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:951)
> at ucar.unidata.idv.ControlDescriptor$1.run(ControlDescriptor.java:876)
> at ucar.unidata.util.Misc$3.run(Misc.java:1018)
> 
> 
> ******************
> Stack trace:
> visad.UnitException: Attempt to convert from unit "Pa" to unit "m"
> at visad.DerivedUnit.toThis(DerivedUnit.java:897)
> at visad.DerivedUnit.toThis(DerivedUnit.java:799)
> at visad.DerivedUnit.toThis(DerivedUnit.java:761)
> at visad.ScaledUnit.toThat(ScaledUnit.java:496)
> at visad.BaseUnit.toThis(BaseUnit.java:539)
> at visad.Unit.toThis(Unit.java:807)
> at visad.Real.getValue(Real.java:289)
> at ucar.unidata.data.grid.GeoGridDataSource.indexOf(GeoGridDataSource.java:1333)
> at ucar.unidata.data.grid.GeoGridDataSource.makeFieldImpl(GeoGridDataSource.java:1375)
> at ucar.unidata.data.grid.GeoGridDataSource.getDataInner(GeoGridDataSource.java:1144)
> at ucar.unidata.data.DataSourceImpl.getData(DataSourceImpl.java:2063)
> at ucar.unidata.data.DirectDataChoice.getData(DirectDataChoice.java:333)
> at ucar.unidata.data.DerivedDataChoice.setData(DerivedDataChoice.java:610)
> at ucar.unidata.data.DerivedDataChoice.collectOperands(DerivedDataChoice.java:537)
> at ucar.unidata.data.DerivedDataChoice.getData(DerivedDataChoice.java:709)
> at ucar.unidata.data.DataChoice.getData(DataChoice.java:620)
> at ucar.unidata.data.DataInstance.getData(DataInstance.java:239)
> at ucar.unidata.data.DataInstance.getData(DataInstance.java:203)
> at ucar.unidata.data.grid.GridDataInstance.init(GridDataInstance.java:204)
> at ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:161)
> at ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:142)
> at ucar.unidata.idv.control.PlanViewControl.doMakeDataInstance(PlanViewControl.java:1172)
> at ucar.unidata.idv.control.DisplayControlImpl.initializeDataInstance(DisplayControlImpl.java:2903)
> at ucar.unidata.idv.control.DisplayControlImpl.setData(DisplayControlImpl.java:2885)
> at ucar.unidata.idv.control.PlanViewControl.setData(PlanViewControl.java:489)
> at ucar.unidata.idv.control.ContourPlanViewControl.setData(ContourPlanViewControl.java:115)
> at ucar.unidata.idv.control.PlanViewControl.init(PlanViewControl.java:398)
> at ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1257)
> at ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:968)
> at ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:951)
> at ucar.unidata.idv.ControlDescriptor$1.run(ControlDescriptor.java:876)
> at ucar.unidata.util.Misc$3.run(Misc.java:1018)
> 
> 
> 


Ticket Details
===================
Ticket ID: IKS-460506
Department: Support IDV
Priority: Normal
Status: Open