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[IDV #CKF-842128]: [Fwd: [Fwd: [Fwd: NEXRAD Feedback Form]]]

Hi Greg-

> Thanks for the reply.
> 
> Let me try this again.
> 
> Displaying 6500KPAH20080623_000848_V03 from the HDSS archive using IDV and 
> the NCDC Viewer (latest beta). When Reflectivity is selected the following 
> elevation angles are found 0.5, 0.5, 1.5, 1.5, 2.4, 3.4 etc. My question 
> concerns the duplicate 0.5 and 1.5 degrees elevation angles. It seems 
> displaying the first elevation angle is the super resolution data. What is 
> the second elevation angle displaying? It appears to be Reflectivity but not 
> the same display as the first elevation angle. Is it Leagcy or Recombined 
> data or something else? Should these duplicate elevation angles even come up 
> when the data is loaded?
> 
> Also for the super resolution data are the lower Velocity and Spectrum Width 
> elevation angles (in this case 0.5 and 1.5 degrees) super resolution even 
> though there are no duplicate elevation angles noted when the data is loaded. 
> Displaying Velocity and SW in IDV and NCDC Viewer the elevation angles noted 
> are 0.5, 1.5, 2.4, 3.4 etc.
> 
> 
> Since the question had to do with the data I sent it to the ROC.

Which was probably the appropriate place to ask.
 
> 
> Hope this clears up my questions.

It gives me a chance to learn some radar processing info as well.

Here's what I found.  It looks like the super-resolution data are
available for scans less than 1.5 degrees.  For these elevations,
"split cut" scans are done with different pulses (2 at each elevation).
The first is useless for radial velocity (and presumably for
spectrum width), but does provide the reflectivity values.  Thus,
you end up with 2 reflectivity field for these elevations, but
only one velocity field.

I found this information at:

http://cimms.ou.edu/rvamb/Documents/IGARSS_2004.pdf

It would be useful if this information (e.g. What is a split cut?)
was in the Build 10 FAQ:

http://www.osf.noaa.gov/NWS_Level_2/BuildInfo/Build10FAQ.aspx

So, that's my take on what you are seeing.  It was good to
see that the patterns in IDV and the NCDC viewer are consistent. ;-)

> Have a happy 4th.

You too.

Hope that helps.

Don

> -----Original Message-----
> From: Unidata IDV Support [mailto:address@hidden]
> Sent: Wed 7/2/2008 8:31 AM
> To: address@hidden
> Cc: address@hidden; Salottolo Greg
> Subject: [IDV #CKF-842128]: [Fwd: [Fwd: [Fwd: NEXRAD Feedback Form]]]
> 
> Hi Steve-
> 
> > Displaying super resolution reflectivity data using the Integrated Data
> > Viewer (IDV). See repeat 0.5 degree elevation angles in data. Display
> > the first one looks like super resolution reflectivity. The second
> > display is reflectivity but is it Legacy data or something else.
> >
> > Also for the super resolution data are the lower Velocity and Spectrum
> > Width elevation angles super resolution even though there are no repeat
> > elevation angles as is seen with Reflectivity data.
> >
> > Thanks ..
> >
> > Greg
> > National Transportation Safety Board
> > Washington D.C.
> > 202.297.8895
> > address@hidden
> 
> This was caused by a problem with the way the IDV was reading
> in the data.  We had one problem and the documentation for
> the Message 31 in the ROC documents are in error which caused
> another issue.
> 
> Greg, if this is still an issue, let us know.
> 
> Don Murray
> 
> > >> I'm forwarding a question from Greg Salottolo at the NTSB about a
> > >> SuperRes display.
> 
> 
> > >> Steve Ansari
> > >> Physical Scientist
> > >> NOAA's National Climatic Data Center
> > >> Veach-Baley Federal Building
> > >> 151 Patton Avenue
> > >> Asheville, NC 28801
> > >> Ph: 828-271-4611
> > >> Fax: 828-271-4022
> > >>
> > >>
> > >> Lt.Col. Saul,
> > >>
> > >> We received this inquiry via the ROC website.  Could you forward this on
> > >> to one of your engineers for a response to Mr. Salottolo?  Please cc: us
> > >> on any correspondence as this information is maintained in a database.
> > >>
> > >> Thanks,
> > >> Stacey
> > >>
> > >>
> > >>
> > >> --
> > >> Stacey Slovacek
> > >> Configuration Management
> > >> NEXRAD Radar Operations Center
> > >> (405) 573-3331
> > >>
> > >>
> > >>
> > >>
> > >
> > >
> > > Ticket Details
> > > ===================
> > > Ticket ID: CKF-842128
> > > Department: Support IDV
> > > Priority: Normal
> > > Status: Open
> > >
> > >
> >
> > --
> > Steve Ansari
> > Physical Scientist
> > NOAA's National Climatic Data Center
> > Veach-Baley Federal Building
> > 151 Patton Avenue
> > Asheville, NC 28801
> > Ph: 828-271-4611
> > Fax: 828-271-4022
> >
> >
> >
> 
> 
> Ticket Details
> ===================
> Ticket ID: CKF-842128
> Department: Support IDV
> Priority: Normal
> Status: Open
> 
> 
> 


Ticket Details
===================
Ticket ID: CKF-842128
Department: Support IDV
Priority: Normal
Status: Open