[Tagging] Adding floor location information

[johnw]

I am mapping Tokyo Dome City, which is a maze of overlapping amenities (an amusement park on top of a shopping mall with a giant pedestrian area with fountains and ramps, bridges, staircases everywhere).  The current issue I am investigating is how to map a large amount of shops onto a single building - the LaQua mall there has over 50 or 60 shops, a spa, rollercoaster, ferris wheel, and a few other odd things all stacked into 1/3 a city block. 

I took a train to another part of Tokyo looking for a shop that was right there in the mall I was in, because it wasn’t even in Google Maps.  I want to add all the shops of the malls I visit to OSM, but as I get closer to Tokyo, the malls get taller and taller ( 0101 at Kita-senju station is 9 floors of 100 shops or so in 100x100m), and the new Lumine mall is directly over Kitasenju’s 4 combined stations), which would lead to an unfathomable amount of tag rendering pollution, so…


a)  is there a best practice to arrange all the point tags for the shops placed on/in the Mall polygon?


b) indicating floor level in the mall is useful, and looking at the wiki shows that the tag addr:floor=* is suggested - but it only has 158 uses - which is amazingly small. is this the right key to indicate what floor a shop is on? 

Javbw