[talk-au] Coastline and beaches

James Livingston lists at sunsetutopia.com
Tue Jan 8 23:55:02 GMT 2013

On 9 January 2013 09:53, James Livingston <lists at sunsetutopia.com> wrote:
> On 8 January 2013 20:32, Brett Russell <brussell237 at live.com.au> wrote:
>> Assuming that I am reading OSM instructions correct the beach is suppose to
>> only extend to the high water mark so the coastline and beach should have a
>> one to one relationship on the water side.  But then I have been wrong
>> before with OSM.
> I think there is what the wiki says, what the wiki says elsewhere,
> what is actually done, and what is a good idea :)
> The coastline page certainly does say that it should extend to the
> high water mark, and the early coastlines based on PGS data probably
> had that. Since people started tracing from imagery, I imagine a lot
> of traced coastline is actually "wherever the water was in the
> imagery" rather than the high water mark.
> If in future we want to map both the low and high water marks, the
> obvious thing to do would be to use coastline for the low water mark,
> water=tidal[0] for the middle area, and beach/whatever for everything
> that's dry.
> I gave up debating these kind of changes long ago, since people are
> never going to agree, regardless of the proposal :-\
> [0] http://wiki.openstreetmap.org/wiki/Tag:water%3Dtidal

Erm, I mean http://wiki.openstreetmap.org/wiki/Proposed_features/Water_cover

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