Opened 6 years ago

Closed 6 years ago

Last modified 6 years ago

#5006 closed defect (wontfix)

Saarburg, Germany vs Saarebourg, France

Reported by: derFred Owned by: geocoding@…
Priority: major Milestone:
Component: nominatim Version:
Keywords: Cc: ma.reiter@…

Description

When I search a route from or to "Saarburg" in Germany

for example with osrm, openrouteservice or graphopper

they always offer Saarebourg in France.

OSM offers as well as the first option Saarebourg in France.

Change History (7)

comment:1 Changed 6 years ago by Sarah Hoffmann

The French town is a perfect name match (through the name:de tag) and deemed more important than the German town.

twain, is that one of the cases the new wikipedia importance weights would improve?

comment:2 Changed 6 years ago by twain

No. To fix this we'd have to add per-language name weighting. And some way to determine which name is the most important.

Very tricky.

comment:3 Changed 6 years ago by Sarah Hoffmann

True, tricky to decide in the general case.

I was wondering if that particular case of Saarburg is actually a case of overlinking in French wikipedia I remember you mentioning once. http://nominatim.openstreetmap.org/details.php?place_id=97934108 seems overrated.

comment:4 in reply to:  3 Changed 6 years ago by derFred

Replying to lonvia:

True, tricky to decide in the general case.

I was wondering if that particular case of Saarburg is actually a case of overlinking in French wikipedia I remember you mentioning once. http://nominatim.openstreetmap.org/details.php?place_id=97934108 seems overrated.

hi

as I am from the region AND just between the two cities ;-) even people in Germany use the french pronounciation to avoid misunderstandings ...

what do you think about to delete the de:Saarburg tag in Saarebourg?

comment:5 Changed 6 years ago by twain

Importance from the new algorithm the french Saarburg drops to 0.48, the german one ends up at 0.51. So yes the new scores would resolve this.

comment:6 Changed 6 years ago by Sarah Hoffmann

Resolution: wontfix
Status: newclosed

The use of the name:de tag is not exactly wrong here but not really helpful as Nominatim expects to find the most frequently used variant in the name tag. I'd suggest to move it to one of the alternative name tags, e.g. alt_name:de or official_name:de. Then it can still be found but it will not appear first anymore (or be listed under the name 'Saarburg' which is probably also rather unexpected in this case).

I'll close this a wontfix, as it is not really decidable for the general case. (Or rather far too much effort.)

comment:7 in reply to:  6 Changed 6 years ago by derFred

Replying to lonvia:

The use of the name:de tag is not exactly wrong here but not really helpful as Nominatim expects to find the most frequently used variant in the name tag. I'd suggest to move it to one of the alternative name tags, e.g. alt_name:de or official_name:de. Then it can still be found but it will not appear first anymore (or be listed under the name 'Saarburg' which is probably also rather unexpected in this case).

I'll close this a wontfix, as it is not really decidable for the general case. (Or rather far too much effort.)

Thank you for testing and a hint for a solution. I will change the tag to alt_name:de because official_name:de would be false.

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