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<body class='hmmessage'><div dir='ltr'>Hi WanMil,<br><br>thanks for testing. Today I found one more rule<br>in Garmin maps that we ignore when writing NOD<br>data. I have no idea yet if that is important or <br>how to implement the rule.<br><br>Gerd<br><br><div>> Date: Sun, 23 Feb 2014 12:15:42 +0100<br>> From: wmgcnfg@web.de<br>> To: mkgmap-dev@lists.mkgmap.org.uk<br>> Subject: Re: [mkgmap-dev] additional arcs patch<br>> <br>> I have compared results from the branch and the trunk.<br>> <br>> I have to revert my suspicion: distances are equal.<br>> <br>> I see some differences in routing so that it seems that larger roads are <br>> much more prefered in trunk than in branch. I'll have to check if that's <br>> good or bad :-)<br>> <br>> WanMil<br>> <br>> > Ignore the Google result.<br>> ><br>> > I am quite sure that there is a difference between the high-prec-coords<br>> > branch and the trunk. I need to recompile the map with the trunk to<br>> > confirm this.<br>> ><br>> > WanMil<br>> ><br>> >> Please, forgive my 2 cents on this:<br>> >><br>> >> Depending on which projection each system is using, distance calculation<br>> >> may (and usually) differ by that much and maybe more. As far as I know,<br>> >> Google uses a Mercator-like projection on a spherical Earth model, which<br>> >> is not correct since Google coordinates refer to the WGS-84 ellipsoid.<br>> >> So you can expect differences, greater with higher latitudes.<br>> >><br>> >> So don't use Google as an accurate reference.<br>> >><br>> >> all the best,<br>> >><br>> >> Paulo<br>> >><br>> >><br>> >> 2014-02-20 17:23 GMT-03:00 WanMil <wmgcnfg@web.de<br>> >> <mailto:wmgcnfg@web.de>>:<br>> >><br>> >> Hi Gerd,<br>> >><br>> >> which difference do you expect regarding the indirect links? I want<br>> >> to get an idea what I should check on my device.<br>> >><br>> >> I have compiled a map using the patch and it seems that distances<br>> >> are slightly underestimated.<br>> >> One example: The distance between Hambug, An der Alster and Munich,<br>> >> Maximiliansplatz:<br>> >> MapSource: 776km<br>> >> Google Maps: 788km<br>> >> Both use the same route.<br>> >><br>> >> I didn't notice it before.<br>> >><br>> >> WanMil<br>> >><br>> >> Hi all,<br>> >><br>> >> attached is a patch for r3065 in the high-prec-coord branch.<br>> >><br>> >> It should improve long distance routing, as it adds additional<br>> >> arcs from minor roads to major roads (so called indirect links).<br>> >> Maybe the improvement is only seen on the device.<br>> >><br>> >> It would be great to hear some test results (good or bad),<br>> >> compared to trunk r3057 and compared to r3065.<br>> >><br>> >> A compiled binary is here:<br>> >> |http://files.mkgmap.org.uk/__download/179/mkgmap.jar<br>> >> <http://files.mkgmap.org.uk/download/179/mkgmap.jar><br>> >><br>> >> |Gerd<br>> >><br>> >><br>> >><br>> >><br>> >> _________________________________________________<br>> >> mkgmap-dev mailing list<br>> >> mkgmap-dev@lists.mkgmap.org.uk<br>> >> <mailto:mkgmap-dev@lists.mkgmap.org.uk><br>> >> http://www.mkgmap.org.uk/__mailman/listinfo/mkgmap-dev<br>> >> <http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev><br>> >><br>> >><br>> >> _________________________________________________<br>> >> mkgmap-dev mailing list<br>> >> mkgmap-dev@lists.mkgmap.org.uk<br>> >> <mailto:mkgmap-dev@lists.mkgmap.org.uk><br>> >> http://www.mkgmap.org.uk/__mailman/listinfo/mkgmap-dev<br>> >> <http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev><br>> >><br>> >><br>> >><br>> >><br>> >> _______________________________________________<br>> >> mkgmap-dev mailing list<br>> >> mkgmap-dev@lists.mkgmap.org.uk<br>> >> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev<br>> >><br>> ><br>> > _______________________________________________<br>> > mkgmap-dev mailing list<br>> > mkgmap-dev@lists.mkgmap.org.uk<br>> > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev<br>> <br>> _______________________________________________<br>> mkgmap-dev mailing list<br>> mkgmap-dev@lists.mkgmap.org.uk<br>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev<br></div> </div></body>
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