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[IDV #DSN-496768]: IDV not generating aerological profiles (soundings)

Hi Simon-

> Test file has been uploaded.
> 
> simon-rfs.nc

Thanks for the sample file.

The basic problem is that the units for Temperature are not specified 
correctly.  "degrees C" is not a valid specification for Celsius.  It is 
getting interpreted at "degrees Coulomb" since C is the international standard 
for Coulomb.  If you change the spec to "Celsius" or "degree_C", then you can 
plot the soundings.  I've attached an NcML file that you can put in the same 
directory which will override the unit spec and let you load in the file.  Load 
that in instead of the netCDF file.

However, at this point, it does not use the pressure field, but uses the 
pressure of the model heights in the standard atmosphere. It will take some 
work to use the actual pressures and I'll leave that for when we revamp the 
sounding display sometime in the future.

Don Murray
> -----Original Message-----
> From: Unidata IDV Support [mailto:address@hidden]
> Sent: Tuesday, September 15, 2009 1:15 AM
> To: Simon Metcalf
> Cc: address@hidden
> Subject: [IDV #DSN-496768]: IDV not generating aerological profiles 
> (soundings)
> 
> Hi Simon-
> 
> The grid sounding subsystem assumes that the vertical dimension is pressure 
> and that's how it gets the pressure for the sounding.  Would you upload a 
> sample file to:
> 
> http://motherlode.ucar.edu/repository/alias/idvupload
> 
> and I'll take a look to see if there is any quick thing we can do to 
> accomodate your files.
> 
> Don Murray
> 
> 
> > Full Name: Simon Metcalf
> > Email Address: address@hidden
> > Organization: NSW Rural Fire Service
> > Package Version: 2.7u2 build date:2009-08-26 16:33 UTC Operating
> > System: Windows XP
> > Hardware: Java: home: C:\Program Files\IDV_2.7u2\jre version: 1.6.0_13
> > j3d:1.5.2 fcs (build4) Description of problem: I can't get IDV to
> > generate an aerological profile (sounding) diagram for data from a
> > local scale meteorological and dispersion model I am using.  In fact,
> > it won't calculate any of the derived functions using data from this
> > model.  I have set up the appropriate aliases so that the Sounding
> > Data functions are available in the list of derrived functions.  I
> > have successfully managed to create profiles using an alternative
> > model.  One aspect to note is that in this model the vertical
> > coordinate system is in metres rather than pressure however the model
> > does have a 4D pressure field for calculations where pressure is
> > required and it is successfully recognising pressure in the list of
> > derived functions, so I don't think the vertical coordinate system is
> > the problem.  A quick glance at the reveals something about the
> > temperature units.  This model stores temperature in Degrees Celsius
> > rather than Kelvin like most models.  If this is a problem do I have
> > to
> convert the units in the Temperature field first?
> >
> > Creating display: Grid Skew-T
> > org.python.core.PyException
> >
> > Traceback (innermost last):
> > File "<string>", line 1, in ?
> > at ucar.visad.Util.vetType(Util.java:256)
> >
> > at
> > ucar.visad.quantities.SaturationVaporPressure.create(SaturationVaporPr
> > essure.java:346)
> >
> > at
> > ucar.unidata.data.grid.DerivedGridFactory.makeDewpointFromTAndRH(Deriv
> > edGridFactory.java:1561)
> >
> > at
> > ucar.unidata.data.grid.DerivedGridFactory.createDewpoint(DerivedGridFa
> > ctory.java:1520)
> >
> > 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
> > (((Longitude, Latitude, Altitude) -> temp[unit:degrees_C])) is
> > incompatible with required MathType (Temperature)
> >
> > ******************
> > Stack trace:
> > Traceback (innermost last):
> > File "<string>", line 1, in ?
> > at ucar.visad.Util.vetType(Util.java:256)
> >
> > at
> > ucar.visad.quantities.SaturationVaporPressure.create(SaturationVaporPr
> > essure.java:346)
> >
> > at
> > ucar.unidata.data.grid.DerivedGridFactory.makeDewpointFromTAndRH(Deriv
> > edGridFactory.java:1561)
> >
> > at
> > ucar.unidata.data.grid.DerivedGridFactory.createDewpoint(DerivedGridFa
> > ctory.java:1520)
> >
> > 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
> > (((Longitude, Latitude, Altitude) -> temp[unit:degrees_C])) is
> > incompatible with required MathType (Temperature)
> >
> >
> >
> 
> 
> Ticket Details
> ===================
> Ticket ID: DSN-496768
> Department: Support IDV
> Priority: Normal
> Status: Open
> 
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Ticket Details
===================
Ticket ID: DSN-496768
Department: Support IDV
Priority: Normal
Status: Open

Attachment: simon-rfs.ncml
Description: Binary data