[Tagging] Flood mark or high water mark

Warin 61sundowner at gmail.com
Sun Aug 5 23:48:08 UTC 2018


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 
> <graemefitz1 at gmail.com <mailto:graemefitz1 at gmail.com>> wrote:
>
>
>
>     On 6 August 2018 at 02:48, Robert Szczepanek <robert at szczepanek.pl
>     <mailto:robert at szczepanek.pl>> 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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