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I can use some help understanding the different German boundaries. We want to index the streetnames per city. So you can do a search for country -> city/town/village -> street -> housenumber. In most countries, all cities, towns and villages have boundaries with admin_level=8 or 9. So if those are indexed, all cities and towns are indexed, and no other administrative divisions. But In Germany, there seem to be Stadtstaaten (with admin_ level=4), Kreisfreie Städte (with admin_ level=6) and Amtsfreie Gemeinden (with admin_level=7). Is it true that, when f.e. for a Stadtstaat with a boundary with admin_level=4, there will be no other boundary added with admin_level=8, to follow the very generally adopted convention that 8 and 9 are used for cities? I wonder why this system was chosen. And how we could possibly make a difference between a Kreisfreie Stadt and a Kreis when indexing the streets. Or is there some better place where I could ask this (I don't know which communication channels are most actively used in Germany) |
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"Kreisfreie Stadt" and "Kreis" is the same for most intents and purposes. (In some parts of Germany, a "Kreisfreie Stadt" will be called "Stadtkreis" and a normal "Kreis" will be called "Landkreis", for example where I live there's a "Stadtkreis Karlsruhe" that sits in a donut hole inside the "Landkreis Karlsruhe" and both are different entities on admin level 6. As you correctly note, a "Stadtstaat" is something different and we have three of them on admin level 4, namely Hamburg, Bremen, and Berlin. It is possible that people have not created adminlevel 6 and 8 boundaries for these because it looks silly to have three different, identical boundaries (although, without having checked on OSM, Bremen consists of two level-8 entities, Bremen and Bremerhaven). You will find myriad idiosyncracies like that in other countries as well. Do you mean that in fact, the Kreisen have also to be divided into admin_level=8 boundaries? So it would be correct to surround Köln with a boundary of admin_level=8 of the same shape as the current level 6 boundary. I want to edit that data, but I need to know what data is considered "correct" according to the Germans.
(18 Aug '12, 15:33)
Sanderd17
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Dear Sanderd, You made two questions Stadtstaat and boundary levels. Stadstaat (Wiki) is a very old definition of a area with certain rules and laws. Theres IMHO no problem if in such a boundary the outer lines get more levels then one fi 4 and 8. Praktical since theres no problem with other areas and it only used if neccesary. Take f.e. Köln. That has a boundary with admin_level=6 (because it's a Kreisfrei Stadt). But there is no other boundary of Keulen. Now, if we want to index the streets of all cities, how do we make a difference between indexing those cities as Köln and general Kreisen, which we don't want to index?
(18 Aug '12, 15:17)
Sanderd17
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