Martijn, I want to make sure I understand what you're trying to convey to the group. Are you saying that If a way has a member role value of "east" then east will mean forward and then west (it's opposite) would mean backward?
Example logic: ** If member role = east, node direction is eastbound would mean forward and backward would mean 'west' ** If member role = west, node direction is westbound would mean forward and backward would mean 'east' ** If member role = north, node direction is northbound would mean forward and backward would mean 'south' ** If member role = south, node direction is southbound would mean forward and backward would mean 'north' If the logic I stated above successfully captured with your suggestion, then I would like to expand on it. Why not just make the cardinal direction value-forward/backward value relationship a bit more simpler? I would like to cite Peter Davies' discussion on the Highway Directions in the US wiki page. He stated that milepoints increase as highways that trend northward or eastward--say positive direction. So if one is traveling south or west on a highway, the milepoints are decreasing--say negative direction. With this in mind, couldn't we just say that north/east = forward (forward movement is positive!) and west/south=backward (backward movement is negative!)? If we're digitizing our edges, the suggestion would be to set the node direction of two-way, aka single-carriageway roads, into a positive direction and the member roles values to north or east. Basically what you did for http://www.openstreetmap.org/browse/relation/2308411, but setting the single-carriageway/two-way roads to 'east' instead of 'west'. Thoughts Martijn? Others?? Best, Kristen --- OSM Profile → http://www.openstreetmap.org/user/KristenK -----Original Message----- From: Martijn van Exel [mailto:m...@rtijn.org] Sent: Tuesday, November 26, 2013 2:47 PM To: Ian Dees Cc: Florian Lohoff; OpenStreetMap-Josm MailConf; OSM US Talk Subject: Re: [Talk-us] [josm-dev] Relation editor support for north/south and east/west similar to forward/backward Yes, sorry for not being clearer. As Ian indicates, this is the *signposted cardinal direction* of a numbered road route, which does not change with the actual compass direction of the road. The guiding principle for the United States is that the odd numbered Interstates are north/south, and the even numbered Interstates are east/west. This is independent from the local compass direction. So for example, I-80 is east-west, but runs almost north-south locally (for example here: http://www.openstreetmap.org/browse/way/203317481) but the sign would still say 'I-80 East' (or West as the case may be). So the relation between the east--west and north--south member roles is equivalent to the relation between forward--backward. Because the cardinal direction is commonly included on the road signs (see example http://www.aaroads.com/west/new_mexico010/bl-010_eb_at_i-010.jpg) this information is useful in the U.S. (and Canadian) context as a drop in replacement for the traditional forward / backward role members. Hope this clarifies somewhat! Martijn On Tue, Nov 26, 2013 at 2:57 PM, Ian Dees <ian.d...@gmail.com> wrote: > On Tue, Nov 26, 2013 at 3:51 PM, Florian Lohoff <f...@zz.de> wrote: >> >> On Tue, Nov 26, 2013 at 12:30:25PM -0700, Martijn van Exel wrote: >> > Hi all, >> > >> > I'm new to this list so please bear with me. >> > The relation editor currently only parses 'forward' and 'backward' >> > roles when considering the visual representation in the rightmost >> > column. In the United States, north/south and east/west are very >> > common as member roles for road routes, because that is how they >> > are officially signposted. >> >> I would be very careful in using this. Is this really "south" e.g. >> 180° ? Or is it more like 99° ? Or 269° ? >> >> Most streets are not strictly on the 90° raster and signposts are >> only rough directions. >> >> Addings this to OSM might make it much more difficult for Data >> Consumers to process and interpret data. > > > No, these aren't compass directions. They're the directionality of the road. > For example, this way is part of the I-94 interstate going west, but a > compass in a car driving on it would tell the viewer they were > pointing > north: > > http://www.openstreetmap.org/browse/way/39372612 -- Martijn van Exel http://oegeo.wordpress.com/ http://openstreetmap.us/ _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-us _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-us