On 06/08/18 09:01, Dave Swarthout wrote:
> I would think a good start would be changing the wiki to make it
historic=flood_level, leaving any reference to high (or low) water to
be a waterways thing ie the high tide mark.
+1
Very sensible IMO.
Yes.
Complication .. a historic king tide combined with a storm event may be
considered a historic flood level.
But 'normal' high tides should be part of the water way tagging system.
On Sun, Aug 5, 2018 at 2:59 PM Graeme Fitzpatrick
<[email protected] <mailto:[email protected]>> wrote:
On 6 August 2018 at 02:48, Robert Szczepanek <[email protected]
<mailto:[email protected]>> wrote:
W dniu 05.08.2018 o 12:23, Volker Schmidt pisze:
Flood marks and high water marks are not necessarily the
same thing.
Read
https://en.wikipedia.org/wiki/High_water_mark
to get the gist.
There are ordinary high water marks (and I suppose also
the opposite, ordinary low water marks) which are based on
the regular tides in the area.
A flood mark would be a marker for the water level reached
in certain, particular events.
I am not sure about terminology in different
jurisdictions, but the concept seems to be clear to me
that there are two different things we want to tag.
I would like it to be so:
- flood marks as flood signs,
- highwater marks as tide signs.
But even in recent scientific papers this division is not so
clear.
Another issue is that from the beginning, on OSM wiki
https://wiki.openstreetmap.org/wiki/Key:historic
mark related to floods is described as
historic=highwater_mark
What would be the optimal tagging solution from OSM point of view?
regards
Robert
I would think a good start would be changing the wiki to make it
historic=flood_level, leaving any reference to high (or low) water
to be a waterways thing ie the high tide mark.
Thanks
Graeme
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Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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