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 <61sundow...@gmail.com
<mailto:61sundow...@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 ...
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