[Tagging] Basic cartography features missing, why?

Anders Torger anders at torger.se
Sun Nov 8 14:36:17 UTC 2020

 From a tool point of view (JOSM etc), multiple databases could be made 
to be experienced exactly the same as different layers, so I guess it 
doesn't matter that much.

With layers you are supposed to be able to turn them on and off at will 
in your editor and choose which you see in an easy way, so such problems 
could be easily spotted and fixed anyway. You could also have automatic 
checkers for layer overlaps. Those issues could be managed, and I think 
the advantages of a layered design clearly outweigh the disadvantages, 
especially when we get more and more data density and more and more 
different types of data.

I don't really care that much exactly how it's implemented, but a 
potential risk I see with having separate databases, perhaps maintained 
by some other entity, rather than readily integrated in the main 
database is that it will get stuck as a niche feature not used by 
OSM-Carto or any of the big providers.

On 2020-11-08 13:41, Tomas Straupis wrote:
> 2020-11-08, sk, 12:31 Anders Torger rašė:
>> To me it seems like an odd "political" design decision to have a
>> separate database though. Why just not arrange the database in layers,
>> and this could be a separate layer? From a technical perspective I
>> suppose it wouldn't have to be layers as such, one layer could in
>> actuality be a tag filter.
>   It must be separate enough to:
>   * not allow reusing objects from "main" database
>   * to have different description on what is allowed in it (for
> example allowing objects borders of which cannot be precisely defined
> etc.)
>   In general it is an advantage that the main database does not have
> layers. In "standard GIS" layers separate data thus we can get bus
> stops in the lake or on the building, road going into the lake etc. In
> OSM it is much easier to spot such problems (and fix them) because it
> is only one layer.

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