--- Lun 17/8/09, Mark Burton <ma...@ordern.com> ha scritto: > Da: Mark Burton <ma...@ordern.com> > Oggetto: Re: [mkgmap-dev] R: Progressing patches > A: mkgmap-dev@lists.mkgmap.org.uk > Data: Lunedì 17 agosto 2009, 11:28 > > Hi Marco, > > > Hi Mark, I did not follow very well last discussions. > I agree in enabling remove-short-arcs by default, but with > no min length (i.e. min lenght=0). > > > > Could you please explain why arcs shorter than 5m > should be collapsed? > > Arc lengths appear to be encoded in units of 16 feet. That > is equal to > approx 4.8m. i.e. an arc that is less than 4.8m is encoded > as length 0. So if we want all arcs to have a non-zero > length, they > must be at least 4.8 metres, rounding up to an integer > gives 5m.
Very strange about the 16 feet units. As far as I kew garmin utilizes MKSA And even if the 16feet units is true, maybe during the encoding a rouding is appied: - an arc <2.4m is encoded as zero 16feet units - between 2.5m and 7.6m is one 16feet units. - etc. At last, in my experience with mkgmap never had problems with --remove-short-arcs without min arc length (i.e. remove only zero length arcs) Ciao, Marco. > > Personally, I am not convinced that having zero length arcs > really > makes a difference. However, some people report that the > minimum length > needs to be greater than 0 otherwise routing is broken in > some places. > > Cheers, > > Mark > _______________________________________________ > mkgmap-dev mailing list > mkgmap-dev@lists.mkgmap.org.uk > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev > _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev