Well even if it's bad style to ask if someone else can do the job, but couldn't we create an addon for existing statistic services, that can calculate this values? I contacted the people behind http://osmstats.altogetherlost.com but even if they hope to provide some country specific calculations, they say that exactly this value would make to heavy load for their servers. Too bad, cause I think a monthly run would be ok for everybody :/
Matthias ----- Original Nachricht ---- Von: Hermann Peifer <pei...@gmx.eu> An: Matthias Meißer <dig...@arcor.de> Datum: 17.11.2011 10:26 Betreff: Re: Statistics on road network length? > 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 > -- _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
