Hi,
http://wiki.openstreetmap.org/wiki/Talk:Tag:natural%3Dlava has some
thoughts how to map lava fields and calderas - I think those should
be finalized and documented.
Cut & paste
Lava fields
natural=bare_rock ("rock" being used in the broad sense of a consolidated
(solid) or unconsolidated (granular) layer)
geological=* with =volcanic_lava_field or more specific tagging for
solidified molten rock, pyroclastic mud flows etc
Lava field features
geological=volcanic_lava_channel — way — lava flowing in a defined
direction
geological=volcanic_lava_tube — way — naturally formed lava tunnel, may be
active or extinct, https://en.wikipedia.org/wiki/Lava_tube
etc
Crater rims
natural=cliff or natural=ridge and
geological=volcanic_caldera_rim
Volcanic vents (a volcano can often be a complex and have multiple vents)
geological=volcanic_vent
Fumaroles
geological=volcanic_fumarole
Geysers
natural=spring or or natural=hot_spring (proposed)
geological=volcanic_geyser (I notice that the Iceland geyser is "Geysir"
but the common English spelling is geyser.
Richard
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