[Tagging] How To Tag Coastlines That Are Also Cliffs?

[Zeke Farwell]

Thanks for all the ideas.  Definitely seems like natural=coastline;cliff is
a bad idea and may screw up coastline rendering.  Using a collection
relation seems like an overly complicated solution.  I think I'll use
  natural=coastline   coastline=cliff   as suggested by Chris.  That makes
the most sense to me.  Of course it won't render for now.  Hopefully one day
this or a slightly different tagging scheme will be rendered.

Zeke


On Sat, May 1, 2010 at 7:16 AM, Chris Hill <osm at raggedred.net> wrote:

> Zeke Farwell wrote:
> > Hi,
> >
> > I'm newly subscribed to the tagging list so I apologize if this has
> > been discussed before.  Didn't find it in the archives though.  I'm
> > working on an area of coastline made up of cliffs and beaches
> > <
> http://www.openstreetmap.org/?lat=36.94817&lon=-122.065787&zoom=18&layers=B000FTF
> >.
> >   There are many sections where the cliffs drop directly into the
> > ocean and it seems logical to me that the coastline and the cliff
> > should be represented as one single way where this is the case.
> Coastlines are at the mean high-water mark. This could be at a variety
> of types of surface: cliffs, beach, shingle, sea wall, mud and so on.
> The way tagging seem to be heading is to add extra modifying tags. So
> the natural=coastline could have an extra coastline=* tag. This could be
> something like
>
> coastline=cliff
> coastline=beach
> coastline=shingle
> coastline=sea_wall
> coastline=mud
> coastline=mangrove
>
> This process allows renderers and other processors to continue using the
> natural=coastline tag as now, but later they may add rendering or
> processing for the extra coastline types. There may also be cliffs or
> sea walls inland of the mean high-water mark, but these are already
> catered for.
>
> Cheers, Chris
>
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