Remove rendering of natural=bay areas

[pnorman]

Fixes #164

Any natural=bay ways I checked were on top of water anyways.

[vincentdephily]

Here is a counter-example.

Should the land polygon be modified to not include the bay ? I know it makes sense, but I dont want to tag for the renderer either.

Example was spoted at random, I wasn't looking for one and others may exist. It would be great to have a way to find "bay over land" systematically.

[dieterdreist]

Am 13/nov/2013 um 19:21 schrieb vincentdephily [email protected]:

Should the land polygon be modified to not include the bay ?

according to Wikipedia a bay is a large body of water and our wiki definition explicitly links to WP for bay, so it seems obvious to exclude the land.

cheers,
Martin

[vincentdephily]

according to Wikipedia a bay is a large body of water and our wiki definition explicitly links to WP for bay, so it seems obvious to exclude the land.

Except that all (?) other osm water features can be drawn over land without having to carve a hole in the land polygon. In that sense, natural=bay is an exception.

Anyway, opening the land polygon is easy enough in the case of bays. Will do that, sorry for the noise.

[gravitystorm]

No, it's a legitimate problem. The majority of water-related area tagging indicates that the area is covered by water (e.g. natural=water, landuse=reservoir and natural=coastline). With natural=bay we've now assumed that the area will also be overlapped by another water-type area, and that you shouldn't expect this particular water area to get a blue fill alone. This 'overlapping' is an unusual assumption in OSM and warrants extra scrutiny.

However, having thought it through a bit more, I'm still happy with the decision. A bay is never the entirety of a water feature - it's always part of something bigger (a lake, an ocean, etc). Since it is an additional level of detail, I'm happy to say that it should require another water-body to cover the same area too, rather than e.g. making a lake area smaller and adding a bay area to fill in the gap.

So by that reasoning, there's no need to have a colour-fill for natural=bay, and any bay should require some other overlapping water feature to define whether it's a lake, ocean etc.