I'm trying to figure out a formula that relates latitude/longitude
to GOES pixel size. The nominal resolution is at the subsatellite
point. Alas, I do not live there, so pixel resolution is degraded
here, and I'd like to know exactly what it is.

Does anyone know of a website/formula that, given a latitude/longitude
(say, 43 N 89 W) will return a pixel size for GOES east or GOES west?
I figure it's "just" geometry, but geometry is way way way way back
in my rear-view mirror.

Thanks,

Scott (really at notscape det not)