When to use ways as common boundaries is an interesting issue with OSM. I have been an active mapper since last Easter and therefore I have though a lot about this. I am currently doing the following as a guideline but sometimes do differently if it seems best.
Between roads and areas, I separate the road and the area. My thinking here is that roads typically have public owned buffer strips on either side and usually a solder, footpath, or curb. The other factor is that roads have two dimensions (width and length) but are represented by a one dimensional line in OSM. Thus even for the case of parking bays on a road it still makes sense to me not use the road as a boundary for the parking bay. I do, however, use common boundaries between adjacent areas. As an example, I have just mapped two schools with a common boundary and both with a boundary with a park without a gap between the boundaries. In this case I then ignore the warning messages from the JOSM validator. For areas and water boundaries (such as coastlines and lake boundaries) I use a common boundary. This makes things easier when the water boundary is tweaked because of better images or survey data. I would tend to treat rivers or streams which again are one dimensional representations of two dimensional things the same way I would treat a road. I hope others find these comments useful, Roy Rankin Liz wrote: > On Sat, 20 Dec 2008, Nick Hocking wrote: >> Talking of bridges, I'm trying to add a bridge, over a storm water drain to >> a road in Canberra. >> However it is just about impossible since on each side of this road is a >> park and the parks are using >> parts of the road as part of their own perimeter. > > I've thought about this a bit more, and its not the best idea to be using > roads as park or other area perimeters. > It sure would make it fast to put this stuff in initially, but any subsequent > alterations - say changes in the road itself - mean big alterations to be > made by the next mapper. > > > > _______________________________________________ > Talk-au mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-au > _______________________________________________ Talk-au mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-au
