OpenStreetMap
These are some dificulties while mapping 'fat' roads and their connections :(
In India while driving we drive on 'left'. I was collecting GPS traces on some big roads.
This road now appears as 2 lines as forward direction line will be on left while reverse direction on the same will appear on right.
I could mark the road as average of these 2 lines. but how do I mark the connections ? For connections i need to extend the actual road which means drawing a non existing road . I also need some practice marking junctions and creating round abouts
토론
2010년 3월 8일 07:20에 wieland님의 의견
Why don't you map it as two oneway roads?
If it is not possible to u-turn at any point, this seems to me the best.
2010년 3월 8일 08:02에 Zartbitter님의 의견
There's no problem extending the roads on connections. This is widely used. Here is one example:
osm.org/go/0HtF_vpbN--
2010년 3월 8일 12:55에 davespod님의 의견
Generally mappers only show two one-way roads where there is physical separation between traffic in each direction. However, if I understand you right, you are concerned that a side-road joining the wide road will be represented by a line going right to the centre line of the wide road? This is quite acceptable. In fact, it is very important they do meet in a junction, if the data is to be used for navigation.
When using lines to represent roads, we are really just mapping the centre lines of the roads and their connections. There has been some debate from time to time about whether micro-mappers should map roads as areas (in addition to mapping the centre lines), which would solve the problem of how it rendered on a large-scale map, but I don't think this is common at the moment.
2010년 3월 9일 00:31에 pavithrans님의 의견
@wieland: There are 3 places where U turn is possible. I think its better to mark them .
2010년 3월 9일 00:31에 pavithrans님의 의견
@ Zartbitter: Thank you that was helpful .
2010년 3월 9일 06:27에 wieland님의 의견
3 places to U turn means mark them.
Sometimes it is only possible to U turn in one direction e.g. here:
osm.org/?lat=49.992257&lon=8.649385&zoom=18&layers=B000FTF
Comming from south or from the gas station you can turn. But not comming from north, than you have to go to the next side street.
2010년 3월 9일 06:47에 pavithrans님의 의견
@davespod Yes the roads must join for navigation . I think making it 2 roads in 2 directions would solve my problem.