OpenStreetMap Indoor Mapping browser.
How it works?
Displayed data are taken 'live' from OSM database is using Overpass API. It's working worldwide.
How to render a building?
In order to render building outline on the map, relation of building should have a way (role 'outer') with tags building='yes' and level='0' (see screenshot below). The relation itself should have tag type='building' and contain subrelations representing building's levels.
Relation of level should have tag type='level' and contain ways - rooms. Each room should be a member of proper level with role 'buildingpart' and should contain tag buildingpart='room'.
For more information please take a look at wiki page.
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