--- Log opened Wed Jan 02 00:00:39 2013
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21:05 #navit: < tryagain> cp15 I have investigated AT polygon problem you talk about @ http://irclogs.navit.ie/%23navit-2012-12-30.log . Looks like it's a maptool problem. Are you interested in details?
21:13 #navit: <@cp15> Yes, sure
21:13 #navit: <@cp15> What is the problem?
21:14 #navit: <@cp15> I have just taken a short look, the AT polygon was considered ok by maptool
21:14 #navit: < tryagain> There are two ways tagged with boundary and highway included in the relation. So relation actually has that ways twice
21:15 #navit: <@cp15> Twice? Why that?
21:15 #navit: < tryagain> because it's seen both as track_gravelled and as country border
21:16 #navit: <@cp15> And the relation collector doesn't check whether something is already included?
21:17 #navit: < tryagain> I think so. At least when I remove highway tag and reprocess country boundary, I get no _broken_ file for AT
21:18 #navit: <@cp15> Ah... The double way is actually creating a polygon consisting of two ways
21:19 #navit: < tryagain> Looks like it inserts into the boundary and doesnt allow it to close as it breaks the sorted order of segments.
21:20 #navit: < tryagain> So we do not have two ways, one closed, and one open (which would be much better).
21:22 #navit: <@cp15> An easy fix would be to remove already processed members from the member_hash
21:22 #navit: <@cp15> But this might hurt turn restrictions, since the ways are split up intentional at nodes and the segments will have the same id
21:23 #navit: <@cp15> It might be even worse: The highway might get split up, but the boundary not, making them hard to compare
21:24 #navit: < tryagain> higway actually gets segmented at each point (probably because it "crosses" boundary). So this will help in 1/2 of cases.
21:24 #navit: < tryagain> yes :)
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21:25 #navit: <@cp15> Damn... Any idea how to solve this?
21:27 #navit: < tryagain> And border way may sometimes have no tagging which correspond to attrmap array. So we should do relations expansion on original ways, before we attrmap them.
21:28 #navit: < tryagain> Might be a perfomance issue though.
21:29 #navit: < tryagain> AT problem is at ways 191115267 and 127793848
21:29 #navit: <@cp15> That doesn't matter... It will be added as street_unkn
21:31 #navit: < tryagain> ok, but that will remove duplicates. And simplify the task as we would have a bit less ways to consider.
21:32 #navit: < tryagain> though we'll have probably to do another node expansion on choosen ways.
21:33 #navit: <@cp15> I think I found an easy to implement solution
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21:34 #navit: <@cp15> In the loop at osm.c line 1648 we can add an attribute "duplicate" to ways where i > 0
21:34 #navit: <@cp15> And the boundary collecting algorithm can then ignore all ways which have a duplicate attribute
21:34 #navit: < tryagain> excellent!
21:35 #navit: <@cp15> Since duplicates are rare the overhead will be small
21:36 #navit: < tryagain> I think I can do it when I get some spare time (in two days or so).
21:37 #navit: <@cp15> That would be great
21:37 #navit: < tryagain> ok
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--- Log closed Thu Jan 03 00:00:39 2013