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 <[email protected]> wrote: > On 19/05/18 13:25, Tod Fitch wrote: > > On May 18, 2018, at 7:33 PM, Warin <[email protected]> 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 ? > > > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging >
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