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Public-images-osm logo.svg building = bridge
Münster, LVM -- 2017 -- 6368.jpg
A building used as a bridge. Show/edit corresponding data item.
Rendering in OSM Carto
Area building=yes.png
Group: buildings
Used on these elements
may be used on nodesshould not be used on waysmay be used on areas (and multipolygon relations)should not be used on relations (except multipolygon relations)
See also
Status: in use

A building used as a bridge (skyway on Wikipedia). Can also represent a gatehouse for drawbridges. building=bridge is a special case of man_made=bridge and inherits all properties of the latter.

When not to use

Do not use this tag just for marking bridges (their outlines). For such purposes use man_made=bridge.

Do not use this tag when the buildings are built merely on the bridge, i.e. can be removed (example: [W] Ponte_Vecchio).

How to map

Draw the area of the object, tag with building=bridge and apply layer=* to the structure (typically layer=1).

Ways using such bridges should be probably mapped by indoor mapping methods, possible approach would be:

  • ways should share nodes with building where they cross the outline of it
  • ways should have the same layer as the overall building=bridge structure
  • ways may have a level=* assigned (indicating level within building)
  • ways may be tagged with some variant of covered=* or tunnel=building_passage or indoor=*
  • ways may be tagged with location=bridge
  • ways should have at least one of covered=*, location=* or bridge=* tags.

It is also possible that the area of the building and of the bridge are not identical or multiple buildings and other objects are on a bridge, in this case the building and other objects should have the same layer as the bridge object and be tagged with location=bridge

More complex examples might also use a bridge relation

See Proposed features/Simplify man made=bridge mapping for related thoughts.

Possible tagging mistakes

If you know places with this tag, verify if it could be tagged with another tag.
Automated edits are strongly discouraged unless you really know what you are doing!

See also