On 19/05/18 13:25, Tod Fitch wrote:
On May 18, 2018, at 7:33 PM, Warin <61sundow...@gmail.com> wrote:
Hi,
I seek comments and thoughts on
-------------
Seasonal:
The seasonal tag in well established. I don't think there is much confusion
with it.
---------------
Intermittent:
The intermittent tag continues to be confused with seasonal.
Possibly this is because some want to use it to indicate that a follow is both
seasonal and intermittent?
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Ephemeral:
There is also ephemeral being used with stream=ephemeral. This cannot be used
with other water features e.g. lakes.
I think the tag ephemeral=yes could be used, other ideas for tagging are
flow=ephemeral, water=ephemeral ...
-------------------
Combinations with seasonal?
Think I have raised this before but not come to any firm conclusion myself.
I think that tagging
seasonal=summer
intermittent= yes
leads to confusion. Is the summer flow intermittent? Or is ther regular summer
flow with intermittent flow at other times of year?
It may be better to tag
seasonal:intermittent=summer
or
seasonal=summer
seasonal:intermittent=winter;autumn;spring
In the semi-arid areas I’ve lived in there are “waterways” that, if they carry
water, only have water in them during the rainy season. But, they may not carry
water throughout the rainy season. Or even carry water at all every rainy
season. So I can see some merit to indicating the seasonality of intermittent
water flow.
If I recall correctly, there was some discussion a while back about using ephemeral
as either a key or as a value to the intermittent key to cover the case where even
during a rainy season it would be rare to encounter water and if you did the water
was likely to be present for only a few hours. But looking at the wiki and taginfo I
don’t see it being used as a value for intermittent. There are only 82 instances of
it being used as a key all with the value “yes". And I don’t recall the final
“bike shedded” result of the mail list discussion. Apparently it did not take hold.
I personally thing “ephemeral” should be a accepted value for the intermittent tag
but apparently I am alone in that opinion.
In any case, your “seasonal:intermittent=summer” tag could also be confusing.
Does that mean that the only time you are likely to encounter water is in
summer but it is only intermittent then? Or does it mean that there is likely
to be water in it during fall, winter and spring but it becomes intermittent in
summer? Basically has the same issue as the current tagging you are noting as
being confusing.
In reading the current wiki, I think the tagging should be a logical and
operation. If there is a seasonal tag, it indicates the season water may be
present. Then if there is a intermittent tag it indicates that even during the
season water is present it is intermittent.
Ok.
I think I have some 3 reasonable things to move forward with.
Intermittent clarification:
Clarify the meaning of intermittent on the OSM wiki! At the moment it says "used to
indicate that a body of water does not permanently contain water."
That is too easily confused with seasonal! I think it should say "used to indicate
that a body of water only has water irregularly." Where should this be 'discussed'?
Intermittent - add values:
Add seasonal values to intermittent e.g. intermittent=summer to indicate that
water might be present irregularly, but only during summer. RFC etc?
Add ephemeral:
Add the ephemeral tag with the same extended values as intermittent above. RFC
etc ?
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