[OSM-talk] natural=coastline (was: Rocky beaches)

[Steve Hill]

On Mon, 14 Apr 2008, Cartinus wrote:

> Lots of coastline in OSM comes from PGS data. According to
> http://wiki.openstreetmap.org/index.php/PGS_whitepaper
>
> "This new shoreline is an approximation of the High Water Line; it is NOT a
> Mean High Water Line since the source data have not been tide coordinated."
>
> This of course says nothing about other coastline data.

Shall I update the wiki to clarify that natural=coastline is (roughly) the 
mean high water mark so we can at least be consistent?

> Dutch topographic maps don't consider tidal flats a part of the land. It is
> coloured the same colour blue as the sea, but it has lots of black dots in
> it.

That's fine - these areas can just be outside the coastline with 
water=tidal.  It probably doesn't matter what we decide the coastline is 
going to represent so long as we are consistent.

  - Steve
    xmpp:steve at nexusuk.org   sip:steve at nexusuk.org   http://www.nexusuk.org/

      Servatis a periculum, servatis a maleficum - Whisper, Evanescence