[Tagging] Feature Proposal - RFC - Ephemeral a water property key.

Joseph Eisenberg joseph.eisenberg at gmail.com
Wed Dec 12 23:44:06 UTC 2018

These comments on the proposal are still valid issues:

“‘at least 90% of the time’ is impossible to be determined by mappers and
is an arbritrary value.

“ephemeral=dry_season has no obvious meaning (is it tagging that waterways
is ephemeral during dry season? Or is it tagging that waterway is ephemeral
and may flow only during dry season”

“the proposed values do not seem right (ephemeral=dry_season is certainly

Perhaps limiting the initial proposal to ephemeral=yes would be helpful.

I would still like to see discussion of the cut-off between regular
intermittent=yes and ephemeral=yes.

Perhaps a simpler statement like “an ephemeral water feature contains water
less than once a year, on average” would be clearer?
On Thu, Dec 13, 2018 at 8:15 AM Warin <61sundowner at gmail.com> wrote:

> Hi
> I have reworked the ephemeral proposal.
> This now demonstrates;
> the difference between intermittent and seasonal - some want to combine
> them into one and see the ephemeral key as just another
> intermittent/seasonal thing so they vote no.
> that ephemeral applies to more that just streams - some want it as a sub
> key to streams .. that is not possible if it applies to other things,
> these people too vote no.
> It now draws on the seasonal page to demonstrate the use of the seasonal
> values.
> I see this key being used by the experienced local who can draw on local
> knowledge.
> The arm chair satellite mapper will have to stick with intermittent as
> they will not be able to determine if seasonal nor ephemeral apply, they
> may not even be able to determine intermittent.
> I hope this proposal page is now somewhat clearer?
> https://wiki.openstreetmap.org/wiki/Proposed_features/ephemeral
> ---------------------------
> I may do a dairy entry on seasonal, intermittent and ephemeral. Looks to
> me like a lot of confusion probably promoted by the use of intermittent
> everywhere.
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