Malcolm Herring ([email protected]) wrote:
On 18/01/2011 12:44, [email protected] wrote:
It would be nice to be able to map the tidal waterways that run in
between the mangroves and saltmarshes - particularly the manmade ones
that have been explicitly cleared to allow marine vessels. Unfortunately
I can't see any way of tagging a waterway that does not imply
freshwater. Ideally we'd have a waterway=tidal_creek or something like
that but this doesn't seem to be in use at all.
A way tagged natural=coastline should follow the local mean *high*
water level so that all tidal areas will be on the wet side of the
way. Any tidal areas (wetlands of all types, beaches, mud, etc) can
be mapped as closed polygon ways that enclose areas above the local
mean *low* water level. These areas will be rendered at the higher
zoom levels. Navigable channels that exist between these areas will
then have been left as non-tidal (i.e. always wet)
Thanks. I understand what you're suggesting, and I was probably a bit
misleading in my original email. The problem is how to differentiate
between sub-low-water level areas that are 2m deep, and the (often
man-made) channels that are sufficiently deep to allow navigation.
--
Charlie
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