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[netCDFJava #BUF-901516]: Error in NEXRAD Level 2 decoder in netcdf-java library versions up to and including 4.3.8 Beta

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  • Subject: [netCDFJava #BUF-901516]: Error in NEXRAD Level 2 decoder in netcdf-java library versions up to and including 4.3.8 Beta
  • Date: Fri, 13 Apr 2012 10:30:42 -0600
Hi Harry:

You're right, we will have a fix out shortly. Thanks!

John

> I use the Units attribute for the date, ignore the time in the
> attribute, use the time after midnight from timeR_HI, and adjust it if
> the volume crosses midnight and the time starts over from zero.
> 
> On 04/12/12 07:42, Unidata netCDF Java Support wrote:
> > Hi Harry:
> >
> > What are you using to figure out what the real time coordinate values 
> > should be ?
> >
> > John
> >
> >
> >>> What Is title_msecs?   I don't see it  There is no such thing.  I just
> >>> ran the decoder on the 2012/04/11 1321 GMT volume for KLGX.   I have
> >>> included the ncdump of the header.
> >>>
> >>>
> >> It is from the volume scan header of each file. We didn't modify or re 
> >> interpolate this value.
> >>
> >> Yuan
> >>
> >>> So what then is the purpose of the units attribute for timeR_HI?   Is it
> >>> just junk?
> >>>
> >> Each value of parameter timeR_HI need this unit to interpolate its value.
> >>
> >> Yuan
> >>
> >>>
> >>>
> >>> On 04/11/12 12:13, Unidata netCDF Java Support wrote:
> >>>
> >>>>>> It appears in every one I look at.
> >>>>>>
> >>>>>> On 04/11/12 09:10, Unidata netCDF Java Support wrote:
> >>>>>>
> >>>>>>
> >>>>>>>> The NetCDF file produced by Netcdf-Java from Nexrad Level 2 files 
> >>>>>>>> lists
> >>>>>>>> the time units for the data like this example:
> >>>>>>>>
> >>>>>>>> timeR_HI:units = "msecs since 2012-04-05T16:26:52Z" ;
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>> This is the time from the global attribute: time_coverage_start.
> >>>>>
> >>>>>
> >>>>>
> >>>> And further more, this attribute is from title_msecs which is time of 
> >>>> data in milliseconds of day past  midnight (UTC)
> >>>>
> >>>>
> >>>> Yuan
> >>>>
> >>>>
> >>>>> Yuan
> >>>>>
> >>>>>
> >>>>>>>> But the actually times in the file are really msecs after midnight on
> >>>>>>>> that date, i.e. either the units should be:
> >>>>>>>>
> >>>>>>>> timeR_HI:units = "msecs since 2012-04-05T00:00:00Z" ;
> >>>>>>>>
> >>>>>>>> or the times should really be msec after the time specified in the 
> >>>>>>>> units
> >>>>>>>> attribute.
> >>>>>>>>
> >>>>>>>> --
> >>>>>>>> Dr. Harry Edmon                        E-MAIL: address@hidden
> >>>>>>>> 206-543-0547 FAX: 206-543-0308
> >>>>>>>> Director of IT, College of the Environment and
> >>>>>>>> Director of Computing, Dept of Atmospheric Sciences
> >>>>>>>> University of Washington, Box 351640, Seattle, WA 98195-1640
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>> Hi Harry,
> >>>>>>>         Are you questioning about the specific file or station? Could 
> >>>>>>> you provide the name and/or station of the file?
> >>>>>>>
> >>>>>>>
> >>>>>>> Thanks,
> >>>>>>>
> >>>>>>> Yuan
> >>>>>>>
> >>>>>>> Ticket Details
> >>>>>>> ===================
> >>>>>>> Ticket ID: BUF-901516
> >>>>>>> Department: Support netCDF Java
> >>>>>>> Priority: High
> >>>>>>> Status: Open
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>> --
> >>>>>> Dr. Harry Edmon                        E-MAIL: address@hidden
> >>>>>> 206-543-0547 FAX: 206-543-0308
> >>>>>> Director of IT, College of the Environment and
> >>>>>> Director of Computing, Dept of Atmospheric Sciences
> >>>>>> University of Washington, Box 351640, Seattle, WA 98195-1640
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>
> >>>> Ticket Details
> >>>> ===================
> >>>> Ticket ID: BUF-901516
> >>>> Department: Support netCDF Java
> >>>> Priority: High
> >>>> Status: Closed
> >>>>
> >>>>
> >>>>
> >>>
> >>> --
> >>> Dr. Harry Edmon                        E-MAIL: address@hidden
> >>> 206-543-0547 FAX: 206-543-0308
> >>> Director of IT, College of the Environment and
> >>> Director of Computing, Dept of Atmospheric Sciences
> >>> University of Washington, Box 351640, Seattle, WA 98195-1640
> >>>
> >>>
> >>>
> >>>
> >>
> >
> > Ticket Details
> > ===================
> > Ticket ID: BUF-901516
> > Department: Support netCDF Java
> > Priority: High
> > Status: Closed
> >
> >
> 
> 
> --
> Dr. Harry Edmon                        E-MAIL: address@hidden
> 206-543-0547 FAX: 206-543-0308
> Director of IT, College of the Environment and
> Director of Computing, Dept of Atmospheric Sciences
> University of Washington, Box 351640, Seattle, WA 98195-1640
> 
> 


Ticket Details
===================
Ticket ID: BUF-901516
Department: Support netCDF Java
Priority: High
Status: Closed