Hi Andrtzej, we are not talking about routable ways here, just lines at rather low resolutions. The problem is caused by the fact that our DP algo calculates the perpendicular distance to the line created by start and end point of a line. In case of a horizontal line with points a,b,c,d,c,b it calculates distance 0 for the points c and d and removes them. What we need is an algo that computes the shortest distance between a point and the line a. Working on that... Gerd
Date: Mon, 24 Mar 2014 19:03:17 +0100 From: popej@poczta.onet.pl To: mkgmap-dev@lists.mkgmap.org.uk Subject: Re: [mkgmap-dev] dissapearing roads
Hi Gerd,
The LineMergeFilter doesn't care about direction and merges the two lines.
In my opinion roads that create acute angle shouldn't be merged unless node has only 2 ways attached. I think processing of angle is essential for a good merging, see old discussion: http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2013q3/018648.html
BTW: does D-P algorithm remove spikes?
-- Best regards, Andrzej
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