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

[Warin]

presence looks to be used with taxi ranks to say when they are expected 
to have taxies present.

There is occurrence .. and that is already in use with occurrence 
=intermittent as part of an import .. excellent!


So
occurrence 
=perennial/non_perennial/seasonal/intermittent/ephemeral/summer/spring/winter/autumn/etc

And of course state that perennial be the default if untagged.

On 14/12/18 13:09, Tod Fitch wrote:
> I do like the idea of one key to rule them all. But I am uncomfortable 
> with a key name which has a negative preface.
>
> At first I wondered about a perennial tag but then the values might be 
> difficult. Then it occurred that we are trying to tag the presence of 
> something, in this case water. There are only a few things tagged with 
> presence=* now [1] and they look unrelated to water. But how about:
>
> presence=perennial/seasonal/intermittent/ephemeral/summer/spring/winter/autumn/ 
> etc.
>
> And state that perennial be the default if untagged.
>
> Cheers!
>
> [1] https://taginfo.openstreetmap.org/keys/presence#values
>
>> On Dec 13, 2018, at 4:55 PM, Warin <61sundowner at gmail.com 
>> <mailto:61sundowner at gmail.com>> wrote:
>>
>> Thoughts ... (take on Hobbit like theme - one key to rule them all...)
>>
>> As both intermittent and seasonal are all render the same .. why not 
>> combine them into one key as well?
>>
>>
>> non_perennial=seasonal/intermittent/ephemeral/summer/spring/winter/autumn/intermittent_summer/ephemeral_summer 
>> etc
>>
>> I note that intermittent is taken by many as 'I know it is 
>> non-perennial' so it may be appropriate to have a non_perennial=yes 
>> for the more common mapping value.
>>
>> ???
>> Well? Is that a reasonable idea?
>>
>> It could be implemented as a mechanical edit on
>> seasonal 1:1.
>> On intermittent=yes ... as non_perennial=yes with a request to 
>> determine a more specific value?
>> On intermittent=/season/ ... as non_perennial=intermittent_/season
>>
>> /These could coexist with the present tags while people changed over.
>>
>>
>> On 14/12/18 10:58, Sergio Manzi wrote:
>>>
>>> You can do *exactly the same* with my new proposed values for 
>>> intermittent=*
>>>
>>> No need for a new key, I think.
>>>
>>> Cheers,
>>>
>>> Sergio
>>>
>>>
>>> On 2018-12-14 00:48, Warin wrote:
>>>> On 13/12/18 12:48, Sergio Manzi wrote:
>>>>>
>>>>>
>>>>> On 2018-12-13 02:36, Warin wrote:
>>>>>> At the moment developing a system to render seasonal values on 
>>>>>> requires a determination on spring/summer/autumn/winter etc .. 
>>>>>> this would add some new terms. Not too hard but does add to things. 
>>>>>
>>>>> Also developing a system to render the ephemeral key would add 
>>>>> some complexity, probably more...
>>>>>
>>>>>> Not certain about ephemeral being subservient to intermittent.
>>>>>
>>>>> If it is not there all of the time, than it is intermittent.
>>>>>
>>>>> If it doesn't last long, than it is ephemeral (/but then it is not 
>>>>> there all of the time and thus it is intermittent too/).
>>>>>
>>>>
>>>> The primary motivation for me is that a water feature with 
>>>> intermittent is more likely to have water, even it I have to dig a 
>>>> meter or two for it, than a water feature with ephemeral.
>>>>
>>>> I don't expect a 'normal' map will tell me this. But a desert map 
>>>> should.
>>>>
>>>> I would map the ephemeral river banks/courses.
>>>> But then the places where water pools to form more permanent water 
>>>> sources I would as natural=water, intermittent=yes. In this way 
>>>> they can be distinguished as a more probable source of water.
>>>> Some satellite imagery shows these .. but then some shows the area 
>>>> just after rain! So it requires some judgements.
>>>>
>>>> I'll add this as a rationale ...
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Tagging mailing list
>>>> Tagging at openstreetmap.org
>>>> https://lists.openstreetmap.org/listinfo/tagging
>>>
>>>

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