[Geocoding] Local level enumeration type vs. OSM conventions

[Bardo Nelgen]

Hi Brian,

thanks for the response. The issue by itself actually is not that 
complex at all: I've just started further amenity mapping / fixing some 
details with the facilities at Frankfurt Airport (FRA). On the current 
view at

http://www.openstreetmap.org/?lat=50.05069&lon=8.57046&zoom=17&layers=M

you essentially look at (from bottom) Terminal 1, the Frankfurt Airport 
(Conference) Centre and the long distance train station / office centre 
"The Squaire" at the AIRail-Terminal.

To ease navigation for passengers and visitors, the operator Fraport, 
right from the early days, introduced a unified level-/floor-counting 
system, which matches across all buildings and facilities (i.e. 
departures is *always* on level 2 – no matter, if there even exists a 
level 1 at all with the respective building…).

Though, unfortunately for our mapping efforts ;-) , they start counting 
at 0 (zero) one level below ground already, which for them is where the 
"airport" starts – and which in turn is right *above* their level -1, 
which contains the underground suburban-train station (which is operated 
by German Railways Deutsche Bahn) an thus does not qualify as 
"part-of-the-airport" in their sense.

This tradition to count the floors of course collides with OSM standards 
by the means, that it's always "one behind" – since OSM counting 
*always* starts with zero as well, though OSM is *always* being counted 
from ground/street level *and not* from the one beneath.

http://wiki.openstreetmap.org/wiki/Key:level

Now, my question was, how to properly map the airport buildings in a 
way, which qualifies for indoor navigation (i.e. automatically displays 
correct floor information to the users in a way, which is reliably 
matching the labelling used at the airport *and at the same time* 
ensures proper rendering with OSM clients, to whom "ground floor", level 
zero, of course is *not beneath, but AT ground level*.

Ideas / best practices anyone? Is there such thing as a level_name ?


Help is highly appreciated!!




Am 10.02.2013 11:08, schrieb Bardo Nelgen:
>
> Hi all,
>
> with some huge buildings (like in this case a large Airport) a 
> different type of level-counting (starts with 0 at OSM -1) is used by 
> the operator, than is with OSM.
>
> Which one am I supposed to use now?
>
> The OSM conventions (and risk deployer-confusion on display) or the 
> local one (putting proper OSM rendering at risk).
>
> Or is there an agreed-upon way to satisfy both?
>
> Thanks in advance for any input on the issue.
>
> Best,
>
> Bardo
>
>
>
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