On Sat, Jan 21, 2017 at 6:11 PM, <richiekenned...@gmail.com> wrote: > Regarding the use of child relations for routes, and what to do about > directional roles on beltways, I made some mapping changes to a beltway > that happens to be local to me. > > > > I took the relation for I-435[1] and “cloned” it into 2 new relations in > JOSM[2][3]. I then deleted all ways from the in the relation and added the > new relations, turning the old relation into the parent. As 435 is a > beltway, I added “(clockwise)” and “(counterclockwise)” to the new > relations. Milepost 0 on I-435 is the junction with I-35 at the southwest > corner and the mileposts increase going clockwise (and do not reset at the > state line) so I used the I-435 bridge over I-35 as my starting point. > Starting there, I organized the ways in the clockwise direction in the JOSM > relation editor. Once I had created a “loop,” I removed all the other ways > from the clockwise relation, then selected the members of the clockwise > relation to remove them from the counterclockwise relation. I then sorted > out the ways for the counterclockwise direction in the same way. > > > > I left the directional roles (i.e. “north,” “south,” “east,” and “west”) > intact to represent how the segments on 435 are signed, and changed roles > previously marked as “forward” back to directional roles. I also happened > to find that I had inadvertently left a gap in the counterclockwise > direction in the Johnson County Gateway project. I also noticed someone has > previously attempted to note the direction in the “ref” tag. I changed > those as well. > > > > Aside from the fact that JOSM does not support the use of directional > roles, I think the changes should make it cleaner for future mappers. > > > > [1]: http://www.openstreetmap.org/relation/62155 > > [2]: http://www.openstreetmap.org/relation/6898835 > > [3]: http://www.openstreetmap.org/relation/6898836 >
It would be easier to verify by using forward in the child relations exclusively. Then it will validate as a loop, or it won't, and the gap becomes immediately apparent. As tagged, most tools (JOSM included) won't "get" it.
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