[Tagging] RFC proposed water property key 'ephemeral '
osm at imagico.de
Fri May 25 09:42:32 UTC 2018
On Friday 25 May 2018, Warin wrote:
> Intermittent does not equal ephemeral.
So you have said repeatedly.
I know this is hard for native English speakers but you need to accept
that tags in OSM do not generally mean what the English language terms
they use mean.
intermittent=yes in OSM currently means quite precisely what the OSM
wiki says it means:
"The intermittent=* key is used to indicate that a body of water does
not permanently contain water."
This includes at least a few 100k features you would define as
ephemeral. You can't change that with a proposal.
There is a reason why such a broad and undifferentiated tag has become
popular in OSM despite there being more differentiated concepts in
existence: Because more differentiation here is in many cases
practically non-verifiable. No matter if mappers observe on the ground
or via images, the usual case is they see the waterbody in a dry state
but see clear indications of recent water cover or water flow hence
they can assume a non-permanent waterbody. This is what you can
currently indicate via intermittent=yes.
But requiring mappers to guess what kind of time pattern the change from
dry to water cover follows does not work. Offering this as an option
in case mappers have more in depth knowledge is a good idea, i said
that in the past. But making it mandatory is bound to fail.
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