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Public-images-osm logo.svg level:ref
The floor an object is located, using locally used method of indicating specific floor. Show/edit corresponding data item.
Group: buildings
Used on these elements
may be used on nodesmay be used on waysmay be used on areas (and multipolygon relations)should not be used on relations (except multipolygon relations)
Useful combination
See also
Status: in use

Level:ref is a property that specifies the ref or name of the level where an object is located, using the locally common method of indicating a specific floor. Particularly useful where levels are not referred to by numbers but by codes (level:ref=A, level:ref=K1) or by names.

level:ref=* is found on two types of features:

Similar tags

There are some similar tags: The address tag addr:floor=* has a very similar meaning. While for some objects using address tags would be weird, the level:ref tag can be used everywhere (but does not bear address semantics explicitly).

addr:floor=* should be certainly used if floor index is part of the address.

See also level=* from the Simple Indoor Tagging scheme, which describes a logical level number (to allow software to understand which level is above/below which other level, and to unambiguously match indoor and outdoor levels), and may therefore differ from how levels are locally called.

Graph of count of appearances of level:ref=* in OSM database. Note that while level:ref=* has more uses than addr:floor=* most of usages were added in mass edits, possibly imports what is revealed by sudden spikes.
Graph of count of appearances of addr:floor=* in OSM database. Compare this far more organic growth of addr:floor=* apparently used in a regular mapping, with spikes on previous graph

External links