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Public-images-osm logo.svg landuse = observatory
Using this tag is discouraged, use man_made=observatory instead. Edit this description in the wiki page. Edit this description in the data item.
Group: Landuse
Used on these elements
should not be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations
Status: deprecated

exclamation mark

This feature has been labeled as deprecated. The recommended replacement is: man_made=observatory.
The reason is documented in Deprecated features. You are still free to continue to use or interpret this tag as you see fit since OpenStreetMap does not have “banned features”.
Under no circumstances should you (semi-)automatically change “deprecated” tags to something else in the database on a large scale without conforming to the Automated Edits code of conduct. Any such change will be reverted.

This tag is in proposal/RFC state, no definitive definition of the tag is found yet. See Proposed features/Observatory