A remote mapper cannot determine if something will have water in it if
the imagery shows no water.
Nor could they determine if a water way (that has water in it in the
imagery) is seasonal or intermittent.
If a mapper cannot see it or has no knowledge of it .. don't map it!
I have seen remote mappers tag things as vehicle highways ... when they
are foot paths and have never seen a vehicle.
Don't map what you cannot see or don't know.
On 20/05/18 12:07, Vao Matua wrote:
For remote mappers seasonal can be ambiguous, the only thing that is
known is that a channel or lake didn't have water when the image was
taken.
In the tropics the notion of summer doesn't make sense, it's a foreign
concept.
intermittent=yes is a fine tag
On Sat, May 19, 2018 at 3:29 PM, Warin <61sundow...@gmail.com
<mailto:61sundow...@gmail.com>> wrote:
On 19/05/18 13:25, Tod Fitch wrote:
On May 18, 2018, at 7:33 PM, Warin <61sundow...@gmail.com
<mailto: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?
-------------
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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