[Tagging] Seasonal, intermittent, and ephemeral water tags
Warin
61sundowner at gmail.com
Sun May 20 02:44:39 UTC 2018
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 <61sundowner at gmail.com
> <mailto:61sundowner at gmail.com>> wrote:
>
> On 19/05/18 13:25, Tod Fitch wrote:
>
> On May 18, 2018, at 7:33 PM, Warin <61sundowner at gmail.com
> <mailto:61sundowner at 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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