[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[THREDDS #JKR-918279]: Nexrad II Cross Correlation Data

Greetings!

Thanks for the additional information. It looks like there's a problem in 
properly handling the unsigned nature of the data by Opendap on TDS 5. I've 
opened an issue it, and you can follow further progress there:

  https://github.com/Unidata/tds/issues/277

If you need a work-around, you can use Siphon's CDMRemote support (which works 
like netCDF4-python's Dataset class) since it's handling the unsigned data 
properly.

Cheers!

Ryan

> Hey Ryan,
> 
> Just wanted to let you know that I might have figured out part of the issue
> here. If I download data straight from OPENDaP, the reflectivity is
> NaN'd above 30.5 dBz. However, if I pull the data using HTTPServer, it's
> completely normal. I hope this sheds some light on what the problem might
> be.
> 
> Thank you so much for all of your help!
> James
> 
> On Wed, Aug 17, 2022 at 6:40 PM James Simkins <address@hidden> wrote:
> 
> > Hi Ryan,
> >
> > Thank you so much for reaching out. It turns out that the issue is
> > actually with higher reflectivity values. For example, for the station
> > KLWX, the highest value for reflectivity is 30.5dbz in the raw reflectivity
> > data. However, on RadarScope, we see the actual values being somewhere
> > around 50dbz.
> >
> > I'm using siphon TDScatalog to grab the data and PyArt to visualize. I've
> > attached screenshots to show the 'holes' in the plotted radar vs what
> > RadarScope is showing.
> >
> > Do you have any ideas as to why this might be happening?
> >
> > Thank you so much for your help!
> > James
> >
> > address@hidden> wrote:
> >
> >> Greetings!
> >>
> >> The data looked fine to me for the single volume I checked from KFTG,
> >> using both OPeNDAP and CDMRemote.
> >>
> >> Can you point to a specific file (site/time) that is showing the problem?
> >> How are you accessing the data or opening the file?
> >>
> >> Cheers!
> >>
> >> Ryan
> >>
> >> > Hello,
> >> >
> >> > I've recently been noticing that the cross correlation variable within
> >> the
> >> > NEXRAD Level II data product is completely blank. This is true for every
> >> > station I checked within:
> >> > https://thredds.ucar.edu/thredds/catalog/nexrad/level2/catalog.html.
> >> >
> >> > Is this a known issue?
> >>
> >>
> >> Ticket Details
> >> ===================
> >> Ticket ID: JKR-918279
> >> Department: Support THREDDS
> >> Priority: Normal
> >> Status: Closed
> >> ===================
> >> NOTE: All email exchanges with Unidata User Support are recorded in the
> >> Unidata inquiry tracking system and then made publicly available through
> >> the web.  If you do not want to have your interactions made available in
> >> this way, you must let us know in each email you send to us.
> >>
> >>
> >>
> >
> > --
> >
> > James Simkins
> > Satellite Meteorologist/Programmer
> > Center for Environmental Monitoring & Analysis (CEMA)
> > University of Delaware
> > address@hidden
> > 610-806-3484
> >
> >
> 
> --
> 
> James Simkins
> Satellite Meteorologist/Programmer
> Center for Environmental Monitoring & Analysis (CEMA)
> University of Delaware
> address@hidden
> 610-806-3484
> 
> 


Ticket Details
===================
Ticket ID: JKR-918279
Department: Support THREDDS
Priority: Normal
Status: Closed
===================
NOTE: All email exchanges with Unidata User Support are recorded in the Unidata 
inquiry tracking system and then made publicly available through the web.  If 
you do not want to have your interactions made available in this way, you must 
let us know in each email you send to us.