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[IDV #TZQ-924803]: Radar multi PPI (Volume scan data) in netCDF (.nc) could not be opened using IDV



> 
> Dear MR.Yuan,
> I am extremely sorry for having put wrong attachement that too in
> unzipped form.
> I am attaching a set of .nc files in zipped form for your perusal and
> comments.
> 
> Regards
> S B thampi

Hi Mr. Thampi,
          Is the geo location correct? The time display of the dataset maybe a 
bug in the CF Radial adapter. The scale factors and added offset should be ok 
to change in different sweep. I will give you a better description about these 
issues next week.

Yuan
> 
> -----Original Message-----
> From: S B Thampi <address@hidden>
> Reply-to: address@hidden
> To: address@hidden
> Subject: Re: [IDV #TZQ-924803]: Radar multi PPI (Volume scan data) in
> netCDF (.nc) could not be opened using IDV
> Date: Thu, 15 Sep 2011 17:54:06 +0530
> 
> Dear Mr.Yuan,
> This is in continuation of my reply posted a few days back  regarding
> CF/Radial data.
> As  informed, I converted the data into .nc file following CF/Radial
> convention and attached.
> Though I am able to  open and visualise the data, I have afew issues to
> be sorted out:
> 
> 1. The date time display is  incorrect. It is whowing 1970-1-1T00:00:00Z
> instead of 2010-05-19T00:07:30Z.
> 
> 2. I have to apply different values for the attributes scale_factors and
> add_offset, for different sweeps, for velocity and spectrum width data.
> Is it possible to achieve that by defining scale factor as a "variable"
> and pass on the value  by stating  VR:scale_factor = "scale_factor" ?
> 
> 3. Data in One of the attached file is written as byte and the other as
> 'int'. The second file size is almost double.  I want to write all data
> in ubyte. is it possible by some means?
> 
> 
> Thanks in advance.
> 
> Regards
> S B Thampi
> 
> 
> -----Original Message-----
> From: Unidata IDV Support <address@hidden>
> Reply-to: address@hidden
> To: address@hidden
> Cc: address@hidden
> Subject: [IDV #TZQ-924803]: Radar multi PPI (Volume scan data) in netCDF
> (.nc) could not be opened using IDV
> Date: Wed, 07 Sep 2011 12:15:17 -0600
> 
> > Full Name: SB Thampi
> > Email Address: address@hidden
> > Organization: India Meteorological Department
> > Package Version: 3.0 build date:@DATE@
> > Operating System: Linux
> > Hardware: Java: home: /home/administrator/IDV_3.0/jre version: 1.6.0_20 
> > j3d:1.5.2 fcs (build4)
> > Description of problem:
> >
> > Netcdf sweep error:init
> > java.lang.NullPointerException
> >
> > I converted Groundbased  Weather Radar Volume scan data in Gematronik
> > Rainbow format to netCDF format using CDL and ncgen utilities.  Unable to
> > open the data in IDV though using ncbrowse I am able to open and visualise
> > the data. I am attaching the .ncfile for your perusal.  Your kind support
> > is solicited.
> >
> > Regards
> > S B Thampi
> 
> Hi Mr. Thampi,
> I checked the netCDF file you attached, this nc file doesn't follow any 
> conventions required by the IDV and can not be constructed as a radial type 
> netCDF file. If you want to generate nc format, please follow this convention:
> 
> http://www.ral.ucar.edu/projects/titan/docs/radial_formats/CfRadialDoc.pdf
> 
> Also be aware that this document is still under development.
> 
> I wonder what is the original format of the radar volume file, does it use 
> the format like NEXRAD? If so, you probably don't need to do any format 
> converting.
> 
> 
> Yuan
> >
> > ******************
> 
> 
> 
> Ticket Details
> ===================
> Ticket ID: TZQ-924803
> Department: Support IDV
> Priority: Normal
> Status: Closed
> 
> 
> 
> --
> S B Thampi,
> Director, CDR Station, Chennai,
> Regional Meteorological Centre,
> India Meteorological Department
> 
> 10th Floor, Port Trust Centenary Building,
> Rajaji Salai, Chennai 600001
> 
> Ph   : +91 44 25393180 (O),
> : +91 44 22248530 (R)
> FAX  : +91 44 25360187
> Mobil: +91 97 91035198
> 
> 
> 
> 
> 


Ticket Details
===================
Ticket ID: TZQ-924803
Department: Support IDV
Priority: High
Status: Open


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