JHU/APL AVHRR Dynamic Window for Northcentral United States

The JHU/APL AVHRR Dynamic Window for Northcentral United States data
sets are available via the World Wide Web at:

"http://fermi.jhuapl.edu/dynatrack/us_nc/index.html"

The following information was abstracted from the description of the
web site: "http://fermi.jhuapl.edu/dynatrack/key.html"

Description of the JHU/APL AVHRR Dynamic
Tracking Windows Web Site

This web site presents images of hurricanes or other areas of interest
by displaying a viewing window centered on a target position. Any
given region within our coverage area may be scanned by up to 4
satellite passes (we currently collect data from NOAA-12, NOAA-14, and
NOAA-15). The web page is updated automatically around the clock
shortly after a pass is completed.

The images are highly compressed JPEG so some loss of quality is
visible but downloading time is minimized. The NOAA AVHRR data used to
make these images has 5 channels. For daylight passes channel 2, near
infrared, is used. Channel 4, thermal infrared, is used when it is too
dark for channel 2. Channel 4 images show cold clouds as dark and
warm water as bright.

The images are geographically registered. Fine tuning of this
registration is called image navigation and is done automatically for
these images. Sometimes for various reasons the images are not
registered so well. Close inspection may show some misregistration
between the plotted coastlines and the real coastlines in the
image. The coordinates labeled on the sides of the image correspond to
the plotted coastlines so allowances must be made for any errors in
registration.

For storm track plots and higher quality images see the JHU/APL
Hurricane Track Map web site ("http://meto.umd.edu/~stevenb/hurr").

Web page by: Ray Sterner
"http://fermi.jhuapl.edu/res"