Hi, > As you can see, I employ four tags to indicate house number ranges: > > * houseno:left-min > * houseno:left-max > * houseno:left-scheme > * houseno:right-min > * houseno:right-max > * houseno:right-scheme > > Left and right are relative to the direction if the way. > Min is the first house number on either side, again looking in the > direction of the way. > Max is the last house number on either side, looking in the direction > of the way. > Scheme can be one of 'even', 'odd' or 'mixed'.
Pitfalls include: * what if way direction is reversed? * what if way is extended, merged, split? * what if way provides access to houses with the address of another way (corner buildings typically - house is on A street but entry is from B street) * what do you do with letters? At least in Germany they sometimes have 2, 4, 6a, 6b, 6c, 6d, 6e, 8... * what if there are gaps in numbering? split the way? Some of this may not seem to important but I would really like to have house numbers on the map, and if at all possible I'd like to avoid printing a number that doesn't even exist. I think we somehow need a two-tiered scheme that on one hand * allows fine-grained tagging of every single house (ideally, if the house is drawn as a building, have the information on the building object itself; however this would possibly require some way of specifying the entrance and/or link to the way it belongs to). and on the other * gives us a "number range" option like yours above. I suspect strong editor support will be required for any of them; whether you use relations (which I prefer) or left-right tagging, you'l probably want the editor to make sure the user doesn't break too many things. A completely different (and quite OSM-like!) option is dropping all this complex logic, left-right-blah tagging, number schemes, relations and all, and just put simple nodes: "This is B street number 25". This brings redundancy, typos, and all - but we're used to that. It would be *extremely* easy to edit, and renderers or routers would have to do a little bit of processing to work with the data. Not too hard probably. I'm not saying either of these is best. We'll have a little "house number hacking workshop" here in Karlsruhe where some of us will try and decide on a working scheme and implement this in a renderer/editor if possible, and enter a few house numbers for the local area, just to see if it works. Bye Frederik _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
