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

Re: 20030313: Nexrad images ETL/NOAA



Dave, 

If nothing else we can meet and discuss when you are here for our
conference. I will discuss with Steve Chiswell for plotting ideas via
GEMPAK and maintain this thread..

Thanks for the info, will get back to you...

-Jeff
____________________________                  _____________________
Jeff Weber                                    address@hidden
Unidata Support                               PH:303-497-8676 
COMET Case Study Library                      FX:303-497-8690
University Corp for Atmospheric Research      3300 Mitchell Ln
http://www.unidata.ucar.edu/staff/jweber      Boulder,Co 80307-3000
________________________________________      ______________________

On Thu, 13 Mar 2003, David Welsh wrote:

> Jeff Weber wrote:
> > 
> > David,
> > 
> > We are speaking of level III data right?
> > 
> > We can feed you the radar data from here if it makes things easier, not
> > sure what FSL is doing with their radar data.
> > 
> > Phone is OK, but we prefer to maintain e-mail records of things of this
> > nature, so we do not need to remember all the details when it crops up
> > again, we can just search our archives..:)
> > 
> > Is the line plot data comma or tab delimited ASCII, how many fields, and
> > what are the feilds..maybe you can send me a "example" data set so I can
> > see if and how much work is needed to make them viewable via GEMPAK..
> > 
> > Steve Chiswell maintains the GEMPAK code for us here and we may want to
> > bring him into this discussion at some point.
> > 
> > I believe you just wanted the base refl tilt from FTG, PUB, CYS, and GLD..
> > 
> > Here is another option...we create a nat'l 1 Km mosaic of the base refl
> > (N0R) and it is completely navigable, so you could do all your plots on
> > the same area and be able to zoom in and out..just an idea.
> > 
> > We have our user committee in town today and tomorrow, so a vist this wek
> > is out, but we have a few slots available next week..
> > 
> > So please send me a sample file of your line plot data, and we can go from
> > there..
> > 
> > Thank you,
> > 
> > -Jeff
> 
> Jeff,
> 
> Yes level 3 data and the base reflectivity of 0.5 degress for now. But they 
> may
> want different angles or the composite in the future. This is the start of the
> project and the NWS folks will be evaluating the Infrasound data for 
> usefulness.
> They may say that the 0.5 angle is too low. The idea is for them to be able to
> see the Infrasound images/lines on one screen and then quickly see the same 
> cell
> on their AWIPS screen to help them identify potential tornado producing cells.
> 
> I have attached a file with 3 lines of data. They are CSV for use in a
> spreadsheet. I also have a program that puts the values into a netCDF file. In
> either case, the latest data line is the one used to generate the line plot 
> when
> the new Nexrad data arrives.
> 
> There are 16 numbers per line:
> 
> The first column is mm/dd/yyyy hh:mm:ss
> Then there are 5 values for each of 3 passbands:
> 
> Passband 1-5 Hz:
> 1. correlation coeficient
> 2. azimuth
> 3. speed
> 4. peak power
> 5. average power
> 
> Passband .5-1 Hz:
> 1. correlation coeficient
> 2. azimuth
> 3. speed
> 4. peak power
> 5. average power
> 
> Passband 5-10 Hz:
> 1. correlation coeficient
> 2. azimuth
> 3. speed
> 4. peak power
> 5. average power
> 
> If the correlation coeficient is > .5, then plot a vector from the Infrasound
> site using the azimuth. Otherwise do not plot a line from the site. There are
> three Infrasound sites: Pueblo, BAO tower, and Goodland.
> 
> After talking to the NWS person who will be evaluating the use of Infrasound 
> to
> detect tornados they would like:
> 
> 1. One radar image per web page
> 2. Only plot line when correlation is >.5
> 
> We need to make a series of plots 3 sites X 3 passbands. The web page will be
> tabbed so they can click on which site-passband they want to see.
> 
> I would be interested in your national composite that is navigable/zoomable. 
> It
> could be another tab for the NWS folks.
> 
> Another thought would be to put the 3 passbands on the same with different
> colors and then evaluate how messy the plot becomes.
> 
> Next Wed and Thurs I am going to the OpenDAP/GIS Unidata conference and taking
> off Fri.
> 
> Thanks,
> 
> Dave
> -- 
> David C. Welsh
> US DoC, NOAA MC R/ET
> 325 Broadway
> Boulder, CO 80305
> 
> O (303) 497-6510  F (303) 497-6978
> http://www.etl.noaa.gov
> 


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.