2009/5/4 Fabrizio Carrai <[email protected]>: > Have a look at http://jan.ucc.nau.edu/~cvm/latlongdist.html > There is also the code of the simple calculation you need. > Of course, this is valid for a way linking two nodes. If the distance you > want to measure is made of several elementar ways, you have to sum of all > the lengths. > Hope this is what you asked for. > Fabrizio > > 2009/5/4 Peter Childs <[email protected]> >> >> I'm probably being completely stupid, But.... >> >> How do I find the distance between two nodes or indeed the length of a >> way. Ideally in miles or km. >> >> Sounds simple but I can't find a simple answer, and the ones I can >> find don't seam to come up with the right answer..... >> >> Thanks in advance >> >> Peter. >> >> _______________________________________________ >> newbies mailing list >> [email protected] >> http://lists.openstreetmap.org/listinfo/newbies > > > _______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies > >
Hmm Short answer.. There is not one.; due to the fact that the earth is not a sphere. For speed many of the route find code uses Pythagoras and ignores real units. There are about 3 different formulas in current use most of which depend upon the radius of the planet; Vincenty, Haversine, and spherical law of cosines they are various degrees of accuracy depending on where you are. See http://www.movable-type.co.uk/scripts/latlong.html Peter Childs _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
