> My main problem with mapping areas to the centre line (I'm not really > counting landuse here, its possibly an exception) is the farcical > situations to which it leads. The buildings example is the best: it's > not uncommon at all to have a road abutted on both sides by buildings. > If we map them to the centreline then we possibly increase their size > by 50%, and happily record that they share a wall. Obviously they > don't, and if you somehow figure out there's also a road in there, you > might be able to reconstruct the real situation given a road width > (which very few people actually record).
One option may be to differentiate between; - a road, represented by a line and - a corridor, represented by an area. The corridor would be that area of land over which the relevant road authority has responsibility and control. Ie the road authority is in charge of not only the bitumen, but also the grass verge, drains, signs, flower stalls, etc... The road would exist inside the corridor, in fact multiple roads can exist inside a single corridor (think of complex intersections). Or a corridor could have no roads at all (think of a road that is planned, but not yet constructed). The road line would still be used for routing, but the road corridor would be used to define that area which is exclusively road, and which neighbouring features butt up against. But now we are talking about a cadastre map, not a street map. nick *********************************************************************** WARNING: This e-mail (including any attachments) may contain legally privileged, confidential or private information and may be protected by copyright. You may only use it if you are the person(s) it was intended to be sent to and if you use it in an authorised way. No one is allowed to use, review, alter, transmit, disclose, distribute, print or copy this e-mail without appropriate authority. If this e-mail was not intended for you and was sent to you by mistake, please telephone or e-mail me immediately, destroy any hardcopies of this e-mail and delete it and any copies of it from your computer system. Any right which the sender may have under copyright law, and any legal privilege and confidentiality attached to this e-mail is not waived or destroyed by that mistake. It is your responsibility to ensure that this e-mail does not contain and is not affected by computer viruses, defects or interference by third parties or replication problems (including incompatibility with your computer system). Opinions contained in this e-mail do not necessarily reflect the opinions of the Queensland Department of Main Roads, Queensland Transport or Maritime Safety Queensland, or endorsed organisations utilising the same infrastructure. *********************************************************************** _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
