Re: [OSM-talk] Reverse look-up gazetteer
2009/3/19 paul youlten : > Does anyone know if there is there a web service that lets me take the > latitude and longitude of a node and establish which country, > state/county/province, city and Zip/post code the node is in? > Flickr has an API method that will do this to city level. http://www.flickr.com/services/api/flickr.places.findByLatLon.html I don't know if Yahoo's GeoPlanet API does this itself http://developer.yahoo.com/geo/ but I think Flickr's method also benefits from corrections Flickr's users make if they drop a photo in a place and the assigned place name is wrong. It's not OSM, but it sounds like what you want. Tom. ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Reverse look-up gazetteer
> Does anyone know if there is there a web service that lets me take the > latitude and longitude of a node and establish which country, > state/county/province, city and Zip/post code the node is in? The most canonical way is to use the boundary data inside OSM. This is usually stored in a relation tagged with the key "admin_level" and values from "2" (for countries) to "10" (for parts of hamlets, depending on the country) which countains all the ways that constitute the boundary. The data is of quite good quality for a lot of cities in various European countries but it is poor for the most country boundaries themselves (there are gaps in the boundaries). But this should improve over the time. I'm currently working as part of a larger project on this service. The reverse gazetteer itself based purely on OSM data works fine, but it is not online yet. Currently, I'm working on making minute updates possible. And the entire system should anyway be re-tested after the move to the 0.6 api which will take place at 20th april. So I think I'll probably go online around mid-may. I you can't wait, I can put the source code on the web, but it is really a huge mess at the moment. Cheers, Roland ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Reverse look-up gazetteer
I am not doing anything that needs great accuracy - there are a few hundred pages on Yellowikis have geo tags in this format: 40 16 05 N 106 53 41 W I want to use a bot to go through the wiki and use these geo tags to make geo categories: like this: [[Category:USState:CO]] geonames.org looks pretty good for this. PaulY On Thu, Mar 19, 2009 at 3:38 PM, Someoneelse wrote: > marcus.wolsc...@googlemail.com wrote: > >> Lets face it. Everyone else manages this (tomtom, google, garmin, ) > > I'm not sure that "everyone else" does make too good a job of it. Google > has quite a few village placenames in the wrong place near me > (Derbyshire, UK). The free satnav on my Blackberry is OK with UK > postcodes but struggles with smaller placenames and "street or feature > in placename". > > ___ > talk mailing list > talk@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk > -- Tel: +44(0) 7814 517 807 ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Reverse look-up gazetteer
On Thu, 19 Mar 2009 14:38:58 +, Someoneelse wrote: > marcus.wolsc...@googlemail.com wrote: > >> Lets face it. Everyone else manages this (tomtom, google, garmin, ) > > I'm not sure that "everyone else" does make too good a job of it. Google > has quite a few village placenames in the wrong place near me > (Derbyshire, UK). Interesting. They seem to be very accurate whenever I use them. Maybe its different for other maps. > The free satnav on my Blackberry is OK with UK > postcodes but struggles with smaller placenames and "street or feature > in placename". You said "free satnav"? Does it use a commercial map? I was comparing us with established commercial applications that use the established $$$-maps. What I like in Map&Guide or tomtom for example is typing in a city and getting all streets, typing in a house-number and getting only the results that have this house-number in the street. This works like a charm even with the smallest villages without presenting me streets from the next village. (When setting your targets, why settle for lower quality then to be >better< then the ones you like to replace.) Marcus ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Reverse look-up gazetteer
marcus.wolsc...@googlemail.com wrote: > Lets face it. Everyone else manages this (tomtom, google, garmin, ) I'm not sure that "everyone else" does make too good a job of it. Google has quite a few village placenames in the wrong place near me (Derbyshire, UK). The free satnav on my Blackberry is OK with UK postcodes but struggles with smaller placenames and "street or feature in placename". ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Reverse look-up gazetteer
>> This will fail if: >> * there are more then 1 place-nodes in the bounding box > > Why not automatically choose the closest place. Possible. What you get is the dreaded " near ". You don't get a defined getCityForStreet() that is guaranteed to return a correct result if it returns a non-null result. Lets face it. Everyone else manages this (tomtom, google, garmin, ) but city-limits, country-limits and zip-codes in OSM are a mess and in desperate need of repair. >> * the city is too large the the node is not in the bounding-box >> * the location does not belong to the city but the center of some village >> is nearby > > Yes, then again with any such "reverse gazeteer" you need to choose an > arbitrary distance to decide what point is "in the city" and what is > outside. Some localities have an associated landuse=residential. That should be a polygon tagged as place=(city|village|...), name=. It often coincides with a landuse but landuse is a rendered area and a city is made up of many, one or no such areas while it has exactly one circumsizing polygon. Marcus ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Reverse look-up gazetteer
2009/3/19 : > On Thu, 19 Mar 2009 14:09:21 +0100, andrzej zaborowski > wrote: >> 2009/3/19 paul youlten : >>> Does anyone know if there is there a web service that lets me take the >>> latitude and longitude of a node and establish which country, >>> state/county/province, city and Zip/post code the node is in? >> >> I don't know of a specific web service but it turns out using the >> usual API you can find the city name quite easily, I first saw it done >> in the party render script: >> http://svn.openstreetmap.org/applications/rendering/party/render.py . >> The post code and other data you would have to pull from somewhere >> else as OSM doesn't store those except for a few places now. > > Hello Andrezej, > > I read the source-code and it just looks for a node with a place-tag > exists in a certain bounding box, expecting to find exactly one. Yes, in practice that simple way turned out to work very well for me. > > This will fail if: > * there are more then 1 place-nodes in the bounding box Why not automatically choose the closest place. > * the city is too large the the node is not in the bounding-box > * the location does not belong to the city but the center of some village > is nearby Yes, then again with any such "reverse gazeteer" you need to choose an arbitrary distance to decide what point is "in the city" and what is outside. Some localities have an associated landuse=residential. > * the location is part of a place=hamlet or anything but "city", "village" > or "town" I didn't say you should literally use the party render code, obviously it's an example. I don't know what use Paul has for this service but it doesn't seem like separate web service is justified (thought it might be, and if there is one already, with zip codes etc...). Regards ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Reverse look-up gazetteer
On Thu, 19 Mar 2009 14:09:21 +0100, andrzej zaborowski wrote: > 2009/3/19 paul youlten : >> Does anyone know if there is there a web service that lets me take the >> latitude and longitude of a node and establish which country, >> state/county/province, city and Zip/post code the node is in? > > I don't know of a specific web service but it turns out using the > usual API you can find the city name quite easily, I first saw it done > in the party render script: > http://svn.openstreetmap.org/applications/rendering/party/render.py . > The post code and other data you would have to pull from somewhere > else as OSM doesn't store those except for a few places now. Hello Andrezej, I read the source-code and it just looks for a node with a place-tag exists in a certain bounding box, expecting to find exactly one. This will fail if: * there are more then 1 place-nodes in the bounding box * the city is too large the the node is not in the bounding-box * the location does not belong to the city but the center of some village is nearby * the location is part of a place=hamlet or anything but "city", "village" or "town" It's also quite expensive to do a bbox-query like that for more then a few locations. So it's neither easy nor anywhere near reliable. It's just a quick hack that works in some cases. Marcus ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Reverse look-up gazetteer
On Thu, 19 Mar 2009 12:01:12 +0100, paul youlten wrote: > Does anyone know if there is there a web service that lets me take the > latitude and longitude of a node and establish which country, > state/county/province, city and Zip/post code the node is in? Not yet. Considering the many missing place-boundary-poylgons and border-polygons (grouped in a relation) and the efford required to collect zip-regions as polygons this will take quite a while. Marcus ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Reverse look-up gazetteer
2009/3/19 paul youlten : > Does anyone know if there is there a web service that lets me take the > latitude and longitude of a node and establish which country, > state/county/province, city and Zip/post code the node is in? I don't know of a specific web service but it turns out using the usual API you can find the city name quite easily, I first saw it done in the party render script: http://svn.openstreetmap.org/applications/rendering/party/render.py . The post code and other data you would have to pull from somewhere else as OSM doesn't store those except for a few places now. Cheers ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Reverse look-up gazetteer
Take a look at the GeoNames.org web service: http://www.geonames.org/export/ws-overview.html I didn't play with it yet, but I believe it can achieve what you're asking for. On Thu, Mar 19, 2009 at 1:01 PM, paul youlten wrote: > Does anyone know if there is there a web service that lets me take the > latitude and longitude of a node and establish which country, > state/county/province, city and Zip/post code the node is in? > > PaulY > -- > Tel: +44(0) 7814 517 807 > > ___ > talk mailing list > talk@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk > ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
[OSM-talk] Reverse look-up gazetteer
Does anyone know if there is there a web service that lets me take the latitude and longitude of a node and establish which country, state/county/province, city and Zip/post code the node is in? PaulY -- Tel: +44(0) 7814 517 807 ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
