Re: [ldm-users] High res Nexrad level 3 much noisier than low res?

• To: Rob Dale <rdale@xxxxxxxxxxxx>
• Subject: Re: [ldm-users] High res Nexrad level 3 much noisier than low res?
• From: Pete Pokrandt <poker@xxxxxxxxxxxx>
• Date: Wed, 02 Jan 2013 17:28:35 -0600

Thanks though.
Pete


On 01/02/2013 05:15 PM, Rob Dale wrote:

There are many more radial solid lines (i.e. something like a building

is

blocking the beam in one direction, or interference with a neighboring

radar)

and also much more noise in general. The Lincoln, IL radar has a radial

line

almost due west pretty much all the time, and the Sioux Falls, SD radar

seems

to have many radial false echos - not a straight line, but lots of

smaller dots

along many of the radials.

I don't see any "more" bad data, it just is more evident due to the higher
resolution.

All of those "artifacts" are quite clearly in the raw data. For example,
L2 from KILX shows the blockage to the west. FSD is showing that
interference(?) pattern. Many of the other spikes are simply sunset
spikes. If you use a 4-bit NIDS viewer you will see the exact same
artifacts, they just might be harder to recognize due to the lower
resolution.

Not sure what, if anything can be done about it, but it's kind of a

bummer

that these higher resolution products have such poor quality control.

I think you are looking at it the wrong way... The 8-bit data is showing
more detail than 4-bit. That's a good thing.

   - ROb

--
Pete Pokrandt - Systems Programmer
UW-Madison Dept of Atmospheric and Oceanic Sciences
608-262-3086  - poker@xxxxxxxxxxxx

• References:
  • [ldm-users] High res Nexrad level 3 much noisier than low res?
    • From: Pete Pokrandt