[mkgmap-dev] [index] Automatic location completionFrom WanMil wmgcnfg at web.de on Thu Feb 24 20:51:34 GMT 2011
>> After the index branch has been developed so far that we can use the >> results in MapSource (thanks to Steve!!) there is a big need for a >> mechanism to fill missing location information. >> >> There has been a lot of discussion about that. It stopped because it >> was quite theoretical (from my point of view). Therefore I have >> started to implement a prototype osm hook that tries to complete the >> missing location information. I think the is_in tag is quite >> problematic therefore I decided to use the addr tags. >> >> Attached is a *very* early implementation that makes use of the >> boundary polygons. It checks all nodes and ways/polygons within all >> boundary polygons and fills the missing addr tags. >> >> I think this is a better foundation for the discussion how we want to >> fill the missing location information. >> >> Before flaming me about terrible code please be aware that: >> * the patch is not optimized >> * it's version 1, so far away from handling all situations / countries >> * it's a very early prototype >> >> I would be happy if you try it and make some proposals how it could be >> improved. >> >> Some improvements I already know and thinking about: >> * The new hook should run after the multipolygon finishing and not before >> * The is_in tag should be handled > I suppose you mean in case boundary polygons are missing. Not really. I thought that I should not add any address information if the is_in tag is already set. But the is_in tag is very problematic. So I should delete this point. >> * boundary information propagation => First go through all boundaries >> and add the information from higher levels to lower ones, i.e. add >> addr:district to all city boundaries within that district >> * Use landuse=residential information in combination with the place nodes >> * In case a boundary level is missing (which mostly will be the case >> for countries admin_level=2), select the addr information from all >> nodes and ways within a boundary by using the most used addr-tag >> value. (in germany the addr:country=DE should be the most used) > According to , there's a great variety in the matching of > admin_level=* to places across countries, so it could be useful to have > some options to choose what admin_level one want to assign to a given > place=*. In a first try of your patch in Spain I see some streets are > assigned suburbs while they should be (IMHO) assigned to cities. > Searching for several streets and leaving city blank I get three (by > now) patterns: > street, city, region, country (the right one for me) > street, suburb, province, country (street assigned to nearest > place=suburb node) > street, suburb, region, country (I don't know if street is assigned to > boundary polygons or to nearest place=suburb node, because both exist > and unpatched mkgmap gives the same result). > I could give you ID's of involved nodes, streets and relations if you > need them. > > http://wiki.openstreetmap.org/wiki/Key:admin_level#admin_level Yes, I expect such configuration needs. It seems as if it will be necessary to have a config file for this information (which addr-level should be used for which information in which country). I'll put it on my list.
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