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[mkgmap-dev] help needed

From GerdP gpetermann_muenchen at hotmail.com on Sat Aug 2 12:23:45 BST 2014

Hi Henning,

you are probably right, maybe the decision also depends 
on the avg. latitude.

we are talking about two different distances:
1) The distance between two points on earth
2) The (shortest) distance between a given point 
and a (great circle) path between two other points.

The algo for 2) uses the results from 1).
In some cases even very small errors in 1) result
in rather big errors in 2). The same problem
occurs when we calculate angles.


osm-8 wrote
> Hi Gerd,
> as I got it right, in nearly all typical cases the fast algo would be ok
> because the error is pretty small. So what about calculating always the
> fast algo and if the calculated distance is larger then X, mkgmap
> calculates the distance again with the more precise algo.
> Henning
> _______________________________________________
> mkgmap-dev mailing list

> mkgmap-dev at .org

> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev

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