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[IDV #VVK-969556]: IDV Unkown vertical coordinate

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  • Subject: [IDV #VVK-969556]: IDV Unkown vertical coordinate
  • Date: Mon, 02 Aug 2010 16:50:19 -0600
> Dear Yuan,
> 
> I uploaded the sample file :
> http://motherlode.ucar.edu/repository/entry/show/RAMADDA/Unidata/Software/IDV/Support+Uploads?entryid=e850985a-8a2c-44e3-8a05-e547cfb963a1
> Entry ID: 118f9ace-dd34-476d-ad8c-e1dcbb069dac
> Entry Title: new ncIDV
> 
> Best regards
> 
> Stefan Peters

Hi Stefan,
     The dataset needs to follow the CF convention:
http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/cf-conventions.html#dimensionless-v-coord

The standard_name and the formula in your file does not look right. The 
following is a example:

 double lev(lev=26);
     :long_name = "hybrid level at midpoints (1000*(A+B))";
     :units = "";
     :positive = "down";
     :_CoordinateAxisType = "GeoZ";
     :_CoordinateZisPositive = "down;

     :standard_name = "atmosphere_hybrid_sigma_pressure_coordinate";
     :formula_terms = "a: hyam b: hybm p0: P0 ps: PS";
     :_CoordinateTransformType = "Vertical";
     :_CoordinateAxes = "lev";

Hope this can help.

Yuan
> 
> -----------------------------------------------------------------------------
> Technische Universität München
> Dipl.-Ing. Stefan Peters
> Fakultät für Bauingenieur- und Vermessungswesen
> Lehrstuhl für Kartographie, Raum 1771
> Arcisstraße 21
> 80333 München
> Tel: +49.89.289.23959
> Fax: +49.89.280.9573
> address@hidden
> www.carto-tum.de
> -----------------------------------------------------------------------------
> 
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: Unidata IDV Support [mailto:address@hidden]
> Gesendet: Freitag, 30. Juli 2010 22:02
> An: address@hidden
> Betreff: [IDV #VVK-969556]: IDV Unkown vertical coordinate
> 
> > Full Name: Stefan Peters
> > Email Address: address@hidden
> > Organization: TUM LFK
> > Package Version: latest
> > Operating System: Windows 2007
> > Hardware:
> > Description of problem:
> >
> > Dear Sir or Madam,
> >
> > my name is Stefan Peters, I am a PHD-candidate at Technical University
> > of Munich Department of Cartography.
> >
> > In my research I try to visualize and investigate 4D  wheather-data
> > (netcdf format) with Unidata IDV.  Thereby I have the following problem
> > within trying to visualize a 3D-plot : "Unkown vertical coordinate with
> > Unit null, using linear scale to Altitude"
> >
> > How can I solve this problem?
> >
> > I know that the z coordinate is calculates by the middle of the both
> > borders (ilev, mlev):
> >
> > p(x,y,z,t) = hyai(z) + hybi(z) * exp(lsp(z,y,z,t))
> >
> > But I dont know how to handle it for IDV?
> >
> > Do I have to define a coordinate system for z coordinates ?
> >
> > I hope you can help me.
> >
> > Best regards
> > Stefan Peters
> >
> >
> >
> Stefan,
> Could you upload a sample file? so I can take a closer look.
> 
> http://motherlode.ucar.edu/repository/alias/idvupload
> 
> Thanks,
> Yuan
> 
> Ticket Details
> ===================
> Ticket ID: VVK-969556
> Department: Support IDV
> Priority: Normal
> Status: Open
> 
> 
> 


Ticket Details
===================
Ticket ID: VVK-969556
Department: Support IDV
Priority: Normal
Status: Closed