[OSM-dev] AND Data to OSM Data mapping

[Ulf Lamping]

Lambertus schrieb:
> Right, for instance, the AND data specifies a finer grain in defining 
> places (OSM: city, town, village, hamlet. AND:  Capital City, Large 
> city, Medium city, Small city, Town, Village, Small village, Tiny village).
>   
When I remember correct, capital city was already mentioned before, so 
it might be just missing in osm and a good candidate for a proposal.

The rest is difficult. First of all, how to distinguish between large, 
medium and small city? What's the benefit of doing so?

I'm not voting against this in principle, but there should be a way to 
find a clear distinguish between these, otherwise we'll get a strange 
mix of things, e.g. one large city with 120000 habitants and a small 
city with 350000, just because the mappers doing so had a different 
point of view.
> We could upgrade our tagging scheme to use AND's, but what if some other 
> large datasource would become available as well which uses  an even 
> finer grain? 
Or even worse: A *different* grain?

The only solution I see is to add a habitants (or alike) tag that states 
the number of habitants (e.g. place=city, habitants=120000), so the 
classification can be derived from it.
> We could also choose to loose detail and use the OSM 
> tagging scheme, but that would not please AND (and possibly others too) 
> I assume.
>   
Unfortunately, every conversion usually looses some data.
> The OSM community needs to develop a consensus about what to do with 
> these kind of differences...
>   
I guess this has to be handled from case to case - and with my 
experience in finding concensus in the OSM community, it might take ages ;-)

Regards, ULFL