Where to get RADAR data? was: Re: [Mapserver-users] variable (proportionately) sized point data

[Gerry Creager N5JXS]

The pixellation you see as you zoom in is, in fact, the way you want to 
see the data.  We're not making a radar mosaic as a pretty picture, 
here, both Daryl and I are making operational graphic overlays on our 
maps.  The pixellation is representative of the data binning that takes 
place: Doppler radar isn't a smooth function, but a regionalized, binned 
process:  The area of each bin is currently roughly 1km x 1km. The color 
value, on the base reflectivity images (the ones Daryl and I make more 
readily available) has a reflectivity in dBz associated with each color 
(and I need to get that scalebar back up...).  Velocities have a value 
associated with point-relative velocity in m/sec.

If we made it a continuous color function we'd lose data in making it 
pretty.

Hope this helps!
Gerry

Swaminathan, Gayathri wrote:
> Daryl,
> Pretty Cool site. But the resolution dithers as I zoom in. Is this how
> it is supposed to be?
> Thanks
> gayathri
> 
> 
>>-----Original Message-----
>>From: mapserver-users-admin at lists.gis.umn.edu 
>>[mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of 
>>Daryl Herzmann
>>Sent: Thursday, April 22, 2004 5:15 PM
>>To: Tyler Mitchell
>>Cc: Gerry Creager N5JXS; Mapserver Users List
>>Subject: Where to get RADAR data? was: Re: [Mapserver-users] 
>>variable (proportionately) sized point data
>>
>>
>>Hi Tyler,
>>
>>On Thu, 22 Apr 2004, Tyler Mitchell wrote:
>>
>>
>>>Gerry, I'm also curious on what's going on in the backend - 
>>
>>some neat 
>>
>>>stuff at any rate.  Where do you get radar?
>>
>>You can get the RADAR imagery from my WMS service.
>>
> 
> http://mesonet.agron.iastate.edu/wms/comprad.php?
> 
> Or you can download the composites directly from.
> 
> http://mesonet.agron.iastate.edu/data/gis/images/unproj/USCOMP/
> 
> Or if you are like Gerry and myself and have the raw NIDS NWS Level III
> data, you can convert these datafiles into composite GIS rasters.  My
> crude HOWTO on this procedure can be found here.
> 
> http://mesonet.agron.iastate.edu/docs/radmapserver/howto.html
> 
> The composites aren't the pretty ones you can get from the commercial 
> vendors, but they work :)
> 
> later,
>   daryl
> 

-- 
Gerry Creager -- gerry.creager at tamu.edu
Network Engineering -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843