[mkgmap-dev] help needed

Fri Aug 1 14:35:17 BST 2014

I'm not sure if it is of any help, but with http://yournavigation.org 
(which also uses OSM) you can specify which distance algorithm to use. 
It uses this PHP class for the calculations:
https://github.com/treffynnon/Geographic-Calculations-in-PHP

Available methods:
Vincenty
Simplified great circle
Haversine
Cosine

Add a &v= parameter to the request to choose the algorithm:
http://wiki.openstreetmap.org/wiki/YOURS#Parameters

/offtopic: I see YOURS should be upgraded with the new class...

On 31/07/2014 18:21, Andrzej Popowski wrote:
> Hi Gerd,
>
> I have looked at your example file in QGIS and Global Mapper and they
> show distance like JOSM. I don't know why there is so big difference. My
> guess is that it could be caused by spherical versus ellipsoidal model
> of the Earth. Maybe you could test algorithms based on Vincenty's
> formulae? See for example:
>
> http://www.gavaghan.org/blog/free-source-code/geodesy-library-vincentys-formula-java/
>
>
> http://geographiclib.sourceforge.net/html/java/
>