Forwarding this to OSM dev from newbies.
---------- Forwarded message ---------- From: Michael Handerek <o...@handerek.net> Date: 2009/5/28 Subject: [OSM-newbies] Reverse geo coding To: "newb...@openstreetmap.org" <newb...@openstreetmap.org> Hi, I am new to osm. I am currently developing a prototype of a reverse geo coding tool based on a local osm db. The input has to be a latitude/longitude pair and the output a human readable address. I already handled it to extract the street name and postal code of a lat/long pair using the tags of a nearest-neighbor-node. To do this with a acceptable query time i use the k-nearest-neighbor algorithm (http://www.bostongis.com/?content_name=postgis_nearest_neighbor_generic#130). Now I have to get at least the country and city name. In order to do this i see two possibilities. 1. Searching for the nearest city node, in order to extract the information from his tags. 2. Creating geometries for each continent, country and city in order to check if nodes are within. May someone know some better method to get the needed information, feel free to discuss. The 1. possibility, also used by 'Where are they' (http://wiki.openstreetmap.org/wiki/Where_Are_They), for me, seems to be imprecise. Regards, Mic _______________________________________________ newbies mailing list newb...@openstreetmap.org http://lists.openstreetmap.org/listinfo/newbies -- Regards, Thomas Wood (Edgemaster) _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
