BGNO, you have been following the "Tags useful for rendering of roads in poor conditions" thread started by Fernando on this same list haven't you ?
I have created a summary page on http://wiki.openstreetmap.org/wiki/User_talk:Davo We hope to reach a consensus on what seems pretty close to what you are asking. Maybe you would like to chip in ? These things always work a bit better if you have a lot of people around you .... David On Mon, 2014-01-13 at 12:29 +0100, BGNO BGNO wrote: > I don't think it is in general possible to derive the trafficability > information from physical models. > In cases like "flooded" it is possible because the model is very > simple and the information needed > (trafficability) can be obtained in a very simple way. The variability > of possible interpretations > of the underlying physics depends on the complexity of the physical model. > > Imagine a dirt road in the mountains of say 20 kilometers length which > crosses rivers here and there. > Now, in order to know if the road can be passed, for every meter of > the road information about > smoothnes, steepness, slipperyness or whatever would have to be > tagged. Who should do that? > > Another problem would be how to derive the information based on the > given data. Can navigation > software derive trafficability reliably from the given data? This > problem reminds me of a wheather > forecast. It is just not possible to do it perfectly, no matter how > powerful the computers in the > data centers are. > > In contrast, if the information that the road can be passed by off > road vehicles is given by local people > then it is probably very reliable. It is not interpretation, it is experience. > > So I think it makes sense to have it both: tags based on physical > models like "smoothness" or "flooded" > for simple cases and tags like "trafficability" for the rest. > > Cheers, > BGNO > > > 2014/1/6 Gerald Weber <gwebe...@gmail.com>: > > On 6 January 2014 08:16, Wolfgang Hinsch <osm-lis...@ivkasogis.de> wrote: > >> > >> Am Montag, den 06.01.2014, 09:44 +0100 schrieb BGNO BGNO: > >> > Isn't smoothness also based on some form of interpretation? > >> > > > > > I think that the problem lies less with the interpretation but with the > > scope of the interpretation. > > > > The smothness tag is very specific which limits the variability of the > > possible interpretations. > > > > On the other hand trafficability makes a very generic statement and as a > > consequence the interpretations may vary a lot. This is also the problem > > with the tracktype tag discussed in the other thread. It makes a very > > generic statement about the road and as such interpretations do vary > > significantly. > > > > Although I like the idea of describing the trafficability of a highway, I > > would not recommend introducing new tags which make such generic > > assessments. I think it would be better to break down the proposed > > trafficability onto more specific tags each with a narrow scope of > > interpretation. > > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
