[Tagging] Hot springs and Geysers

[Joseph Eisenberg]

There are now over 500 hot springs mapped with natural=hot_spring. The tag
was proposed way back in 2008 but the proposal was never approved. Wiki:
https://wiki.openstreetmap.org/wiki/Tag:natural%3Dhot_spring
Original proposal:
https://wiki.openstreetmap.org/wiki/Proposed_features/Hot_Spring

Some people have suggested tagging hot springs with natural=spring and a
spring=hot subtag, but hot springs have a quite different geological origin
and cultural significance. The wiki page for natural=spring has a link to
hot spring:
https://wiki.openstreetmap.org/wiki/Tag:natural%3Dspring

Geysers are also tagged natural=geyser. They could be considered a type of
spring, but they are also similar to a fumarole or volcanic vent, and I
would be quite surprised to see a geyser mapped as a “spring”
Wiki:
https://wiki.openstreetmap.org/wiki/Tag:natural%3Dgeyser

Thoughts on these tags? If natural=hot_springbkeeps climbing in use, we
could start rendering it on the Openstreetmap-Carto style (“standard
layer”) soon, if there is agreement on the tagging.
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