On 16/11/2011 17:27, Matthias Meißer wrote:
Thanks Frederik! I think this will do it :)
bye
Matthias
Just to let you know: I am occasionally running my own script which is
kind of similar to Frederik's Perl script. As OSM input data, I am using
the .pbf files from [1]
For the Haversine Formula, I followed the explanations at [2]. This
formula calculates distances between 2 points on a spherical Earth.
There can be 1% of differences compared to distances measured on an
ellipsoid. I am using 6367516.477 m as Earth radius, which is the mean
of a^2/b and b^2/a, where a and b are the semi-major/minor axis of the
WGS84 ellipsoid.
(As a side remark: the distance between 2 nodes of an OSM way is often
below 100m, so any considerations about distances on spheres vs.
ellipsoids are rather of an academical nature.)
Concerning the issue with dual carriageways, I am using a brute-force
approach and divide the calculated distance by 2 if these conditions are
true:
highway ~ /^(motorway|trunk|primary|secondary|tertiary)/ &&
oneway ~ /yes|true|1/
(If someone has a better algorithm: I would be interested.)
Hermann
[1] http://download.geofabrik.de/osm/europe/
[2] http://mathforum.org/library/drmath/view/51879.html
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