Christopher Barker wrote:
Yilmaz Arslanoglu wrote:
I wanted to compute the distance between two points,
you need to be clear by what you mean here: I suspect you mean:
"The shortest distance between two points following the surface of the
earth"
In which case, what you are looking for is referred to as the geodesic
distance:
http://www.vterrain.org/Misc/distance.html
To do this accurately (and you may not need much accuracy!) on an
ellipsoid requires a fair bit of math. I don't know if it's built in to
OGR or PROJ at this point, but there are a few libraries out that that
do it, including Gerald I. Evenden's "geodesic" lib, which can be found
here:
http://home.comcast.net/~gevenden56/geodesy/project/
Here is another interesting article on that subject:
http://www.codeguru.com/Cpp/Cpp/algorithms/general/article.php/c5115/
Best regards,
--
Mateusz Loskot, http://mateusz.loskot.net
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