Streets in suburbs can't be found

[nailix1]

Streets in suburbs of big citys can't be found. The name of the suburb is necessary but seldom known.

I previousliy used WeTravel?. This provided the function "search more", which searched the streetname in the next - puh, don't know - perhaps 15 "locations" around.

This was a very useful feature.

[tryagain]

This currently can be done with the POI search filter. So you can look for objects by their name within given distance from the given point.

Though generic search should be improved in above way.

[nailix1]

Great tip. Thank you very much.

[sleske]

Could you provide an example of a street that cannot be found (or better, several examples)? Please also state where you got the map from. Without that, we can't investigate the problem.

[nailix1]

For example: Barlachstraße in Nürnberg (Germany) ( ​http://www.openstreetmap.org/?lat=49.37348&lon=11.08059&zoom=16&layers=M )

This street is located in an suburb of Nürnberg called "Herpersdorf".

But Herpersdorf belongs to Nürnberg and officially the adresse is called Barlachstraße in Nürnberg.

Map comes frome the Planet Extractor (​http://maps9.navit-project.org/)

[sleske]

Thanks for the test case. I cannot look into it right now, but I'll try to get to it. Can't promise anything though...

[sleske]

This is probably because Navit at present does not really use the exact area of a city; it just approximates a city by a circle, whose size depends on the size of the city. So streets on the outskirts are sometimes not found. I'll try to look at the problem more closely, but I suspect this is the problem.

[sleske]

I have checked this problem, and it is indeed caused by Navit's approximation of city/town sizes. In binfile.c:binmap_search_street_by_estimate() , large cities get an estimated size of 10,000 (metres, I think). If I increase this to e.g. 13,000, Navit finds the Barlachstraße in Nürnberg.

I believe this problem has been discussed before; to solve it Navit would have to use the actual area/borders of cities, which is not yet implemented.

Also see #794 for a related problem.

[usul]

I can confirm your issue for current SVN5532 and current OSM mapset this issue still accurs for your example "Nürnberg, Barlachstraße".

As others already pointed out, this is due the hierachial index that maptool creates and how it determines this hierachies. For OSM this can be addr:city=* tags or boundary relations. We need to investigate, how we might optimize this aspect.

[usul]

As this is a essential feature and the bug will cause that users will don't find their way, I assign it to the new hotfix release.

[tryagain]

Usul,

I have got expected search results for Nurnberg, Barlachstraße with svn5539 and today (130710) map.

May be you were testing with wrong Nurnberg? I was using Nurnberg with postal code of 90403 and found Barlachstrasse.

I think the sample problem was actually solved in February-March, 2013.

The function "search more", as suggested in ticket description, could be a useful feature in some cases, like the one described in #562. But we have the POI filter workaround for that.

tryagain.

[rico (2)]

I have a similar problem with districts in municipalities in Germany.

For example, i cant find street "Blumenstraße" in village Güngräbchen. ​http://www.openstreetmap.org/#map=18/51.35570/13.97580

Grüngräbchen is a district of Schwepnitz, which is a village and municipality with admin_level=8. I can't find neither village Grüngräbchen nor Blumenstraße in Schwepnitz.

And, as a local stranger I don't know Grüngräbchen is a district of Schwepnitz.

Edit: With Maps from Planet Extractor it works, but not with selfmade maps from geofrabrik.de extracts.

Rico

[tryagain]

What geofabric.de extract do you use? It should contain complete DE boundary for search to work.

If you want to use a smaller region extract, please feed your extract to maptool together with contents of 51477 (DE boundary) relation:

cat relation-51477.osm your-extract.osm | maptool mapfile.bin

relation-51477.osm should contain relation itself, all ways it references, and all nodes of that ways. It may be downloaded with JOSM.

We even have this information on wiki, see ​https://wiki.navit-project.org/index.php/OpenStreetMap#Convert_OSM_data_to_Navit_binfile. Should we add more details there?

[rico (2)]

That was the problem. Downloaded region was only Saxony and Germanys boundary relation wasn't complete. I think, that should be mentioned in the wiki.

[http://wiki.navit-project.org/index.php/user:jkoan]

This ticket was pushed back in order to bring 0.5.1 out soon.