On Sun, Jan 31, 2010 at 11:15 AM, John Smith <deltafoxtrot...@gmail.com>wrote:
> On 1 February 2010 02:10, Anthony <o...@inbox.org> wrote: > > Maybe your implementation of micro mapping lanes doesn't have anything to > do > > with areas, but then, if so it probably doesn't work. How do you > represent > > gore areas which have highly variable widths as anything but areas? If > > you've got a solution for it I'm all ears. > > Think railway tracks... > I think railway tracks have constant widths. Otherwise the trains would have a lot of problems. > Why do you need to represent road way area so accurately to show the > lane to be in to exit as depicted, I highly doubt that depiction used > area information to display the lanes etc, it would have been > estimations. > I don't understand the question. > Areas are also by far the easiest way to indicate both widths and > > connectivity. In order to map > > Areas are of limited value besides showing where the road base > occupies, and even then it won't be 100% accurate since we're not > doing raster mapping. > Why is raster mapping more accurate? I thought the point of vector graphics was that they were *more* accurate. Nothing is going to be 100% accurate, of course. Limited value besides... Fine, at least you agree it is of some value. > As for connectivity, highly doubtful, you can't indicate valid > direction that traffic can go. > You can if you designate one way as left and one way as right. I do not mean for "area" to imply "single closed way". > > > http://mytechnews.info/b/wp-content/uploads/2009/02/nuvi-lane-assistance.jpg > > you need to represent the two lanes on the right and the three on the > left > > as separate ways. But you also need to show that it is possible to route > > between them (although with extra caution - i.e. a solid white line). > > Again, think railway tracks... how do railway tracks merge and split? > Not like roadways. Trains can only drive along tracks. Those tracks are a fixed distance apart. It's nothing like a highway. > but if you want to avoid a lot of complicated work you have to map the > > *sides* of the (sets of) lanes, not the *middle* of them. > > Or using some kind of cascade method from ways so you can use the > existing way tags to flow down into lanes... > I'll stick with the specific solution I've already worked out, rather than "some kind of cascade method".
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