OpenStreetMap
http://wiki.openstreetmap.org/wiki/IndoorOSM
In the areas I work some concentrate on working in large land use polygons but my focus is on more detail so I’ll be learning some more of these ideas for indoor mapping (mainly of the many complex buildings in the city).
Access to the internet is still low for me so updates might take a few weeks to put in…
Discussion
Comment from Peda on 1 October 2014 at 21:41
Just as a note: Imho one should prefer the Simple Indoor Tagging. It’s supposed to supersede IndoorOSM. Especially it’s supposed to be much easier to use and more descriptive at the same time.