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

Re: [Fwd: Re: National Radar Mosaic]

Tim,

I create the radar mosaic from level 3 N0R products for the Unidata IDD
in both
GRIB and a GINI image format (using GEMPAK programs GDRADR and NEX2GINI
which I wote) as is documented in my GEMPAK examples here:

http://www.unidata.ucar.edu/software/gempak/examples/gdradr/

The web page documents how to create the mosaic from the level 3 site
products.
Since GEMPAK is freely available for download from our web site, anyone
can obtain my program and use it to generate their own mosaics or use
the gridded (eg digital point values) data - I provide an example of how
to use the RUC grids to create a
precipitation type mosaic as well.

I also provide another program NEX2IMG to create a simple raster which
can be used with mapserver GIS such as
http://mesonet.agron.iastate.edu/docs/radmapserver/
which Daryl Herzman of Iowa State was kind enough to put together a
how-to document:
http://mesonet.agron.iastate.edu/docs/radmapserver/howto.html

The NSSL group (Ken Howard) is producimg a 3D volume mosaic from level 2
data which would be a better "digital" source for anyone that didn't
want the step
of using level 3 products (eg the binned data values) such as I do.

Steve Chiswell
Unidata User Support




On Mon, 2007-03-12 at 06:42 -0600, Linda Miller wrote:
> Hi Chiz,
> 
> Can you help Tim Crum with this question? 
> 
> Thanks!
> 
> Linda
> 
> Tim D Crum wrote:
> > Linda,
> >
> > Do you know the source of the attached mosaic?  The company who sent 
> > it to me has lots of questions about the mosaic for their possible 
> > use.  Here are the questions John Dutton asked:
> >
> > We are attempting to use the National Radar Mosaic as verification 
> > data for a Bayesian system for predicting severe convection and severe 
> > weather. The problem is how to convert the GINI format in which it is 
> > coded (presumably by your group) into a digital representation.
> >
> > We are making little progress after several days of poring through 
> > mostly outdated documents on the Web and through endless files of 
> > Unidata emails from users asking the same question: how do we decode 
> > the GINI files into usable numbers?   It would seem we could just 
> > reverse the process that converted db into a color code and get db back.
> >
> > We see that there is a GRIB version of the mosaic every 30 minutes, 
> > but that obviously is not the same as the much more frequent  data in 
> > the mosaic.
> >
> > Obviously, rather  than decoding the GINI representation of the file 
> > it might be simpler and easier to start with the digital file that is 
> > coded into GINI format.   Does such files exist? Are they available?  
> > Are the 30-min GRIB files samples from a much more frequent set of 
> > GRIB mosaics?
> >
> > Any advice and assistance will be much appreciated.
> >
> >
> > Linda, please let me know what you learn or with suggestions on who I 
> > should turn to.  Thank you!
> >
> >
> > Tim
> >
> >
> >
> > ------------------------------------------------------------------------
> >
> > Subject:
> > Re: National Radar Mosaic
> > From:
> > Jeremy Ross <address@hidden>
> > Date:
> > Fri, 09 Mar 2007 14:28:35 -0500
> > To:
> > Tim D Crum <address@hidden>
> >
> > To:
> > Tim D Crum <address@hidden>
> >
> >
> > Tim,
> >
> > Here is an example of the GINI formatted 1km radar image acquired from 
> > the Unidata IDD and displayed in GARP/Gempak every 5-10 minutes.  If 
> > you know of any other sources of high spatial and temporal resolution 
> > radar data, we would be interested in possibly acquiring that data.
> >
> > Thanks,
> > -Jeremy
> >  
> >
> >
> > *Jeremy D. Ross, Ph.D.*
> > Senior Research Scientist
> > Lead Forecaster / World Climate Service
> >
> > Phone:      (814) 357-8490
> > Fax:        (814) 357-8499
> > E-Mail:     address@hidden <mailto:address@hidden>
> > Visit us at www.weatherventures.com. <http://www.weatherventures.com/>
> >
> >
> >
> >
> > On 3/8/07, *address@hidden <mailto:address@hidden>* < 
> > address@hidden <mailto:address@hidden>> wrote:
> >
> >     Tim
> >
> >     Please phone Jeremy Ross, at ZedX, Inc.,
> >     814 357 8490
> >
> >     or
> >
> >     814 441 0489
> >
> >
> >     since I am travelling the rest of this week.
> >
> >     Thanks, I hope you can help us.
> >
> >     John
> >
> >
> >
> >     On Wed, March 7, 2007 11:05 am, Tim D Crum wrote:
> >     > John,
> >     >
> >     >
> >     > Please give me a phone number where I can reach you or your point of
> >     > contact working your problem with the radar mosaic.  We do not
> >     generate the
> >     > mosaics here, but I hopefully can provide you the information
> >     you are
> >     > requesting.
> >     >
> >     >
> >     > Tim
> >     >
> >     >
> >     >
> >     > Tim Crum, Ph.D.
> >     > National Weather Service
> >     > WSR-88D Radar Operations Center
> >     > 405-573-8888
> >     >
> >     >
> >
> >
> >
> >
> >
> >
> >
> >
> >     
> >
> >     
> >
> >     
> >
> >
> > ------------------------------------------------------------------------
> >
> 
-- 
Steve Chiswell <address@hidden>
Unidata