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I have found what could be the source of all the satellite
pix you see on all those weather websites. The files at:



get updated as often as once every 8 minutes and are unprocessed and
do not have map overlays applied.

To me, the "weather products" one sees on commerical weather sites
look like processed version os these images.

So, I thought "Hey, I could hack my own satellite images." (rubbing
hands rapidly with glee).

I wrote a script to combines the 3.9, 6.75, 10.7 and 12.0 micrometer
infrared images of the south east ontario area.

I am trying to create a near-realtime map of clouds around the ottawa
area. The problem is dont understand the science that would allow one
to derive total cloud cover from sat images. So I played around with
a compositing algorithm. I'd say it so-so at the moment. When its
clear in ottawa, the map shows reasonably dark. Cloudy shows up
at grey or white. I think i'll need to keep tweaking it.

You can see the results on the OAFs mainpage. The image is quite small
to keep the processing times low. But I it gets updated as often
as every 8 minutes (NASA willing). I think that is cool since the
weather websites seem to do it only once per hour.

If you have ideas on how to make that image more useful, please
let me know. (I'd really like to know the algorithm for deriving
total cloud cover from sat pix.)

Clear skies, in near-realtime

-ad

"its wafer thin!"









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