[OSM-talk] Rocky beaches

[Cartinus]

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.

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.

-- 
m.v.g.,
Cartinus