Re: GPS formulas

"Tauno Voipio" <tauno.voipio@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:dRIme.320$0T.38@xxxxxxxxxxxxxxxx
> That'a why a plain plane trigonometry formula with latitude
> correction gives the best results on short tracks. Take one
> degree to correspond 111.11 km and multiply the east-west
> (longitude) difference with the cosine of the avreage latitude
> of the track, then use Pythagoras' theorem for the rest.

I've used a similar approach: calculate the km/degree of latitude factor for
the average latitude of the two points, and then use Pythagoras.

This approach is simple, gives increasingly accurate results with shorter
distances, but doesn't work too well near the poles or over very large
distances. Polar explorers and astronauts probably shouldn't use it.

Steve
http://www.fivetrees.com


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