The wiki documents amenity=shelter + shelter_type=rock_shelter [1] as "A rock shelter is a shallow cave-like opening at the base of a bluff or cliff." It has ~500 uses globally.
In Australia these rock shelters known as rock overhangs or cliff overhangs are extensively mistagged as natural=cave_entrance. Although many of these overhangs are named as a cave like "Darks Cave", I don't think they are quite the same as natural=cave_entrance, which seems more for entrances to underground cavities which you walk into with at times a narrow opening, ie a proper cave. The Australian community has indicated that amenity=shelter + shelter_type=rock_shelter is not an appropriate tag in this case since these are natural features not man made features so shouldn't be under the amenity key [2] [3] [4]. I think the amenity/natural key is just a historical artefact, and doesn't need to strictly imply natural/non-natural. Should we create a new natural tag and deprecate shelter_type=rock_shelter, or just accept the tag as in use? Appreciate any comments either way. I just want to see single globally accepted tag to avoid tag proliferation. [1] https://wiki.openstreetmap.org/wiki/Key%3Ashelter_type [2] https://lists.openstreetmap.org/pipermail/talk-au/2019-April/012578.html [3] https://lists.openstreetmap.org/pipermail/talk-au/2019-March/012529.html [4] https://lists.openstreetmap.org/pipermail/talk-au/2019-March/012530.html
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