[Tilesathome] Islands at sea that are contained entirely in a tileget inverted

[D Tucny]

On 11/11/2007, David Groom <reviews at pacific-rim.net> wrote:
>
> > Hi Folks,
> >
> > Not sure if anyone else has noticed this, but, it seems that if an
> > island/a
> > group of islands is, surrounded entirely by coast, fits entirely in a
> > tile,
> > and, there is no other coast line passing through the tile, the island
> > becomes a lake and the sea becomes land...
> >
> > e.g.
> >
> > http://tah.openstreetmap.org/Tiles/tile/12/3440/1688.png
> > http://tah.openstreetmap.org/Tiles/tile/12/3434/1687.png
> > http://tah.openstreetmap.org/Tiles/tile/12/3434/1686.png
> > http://tah.openstreetmap.org/Tiles/tile/12/3434/1685.png
> > http://tah.openstreetmap.org/Tiles/tile/12/3432/1686.png
> >
> > d
> >
>
> are you sure the islands way are anti-clockwise, ie with sea to the right
> of
> the segments?
>
> David
>
>
>
Yep, I'm sure :)

This is the area you can paste into JOSM to see the data in
http://tah.openstreetmap.org/Tiles/tile/12/3434/1687.png
http://www.openstreetmap.org/index.html?mlat=30.21864415334073&mlon=121.89061078577959&zoom=14

3 islands, 3 ways, id's 9982973, 9983658, 10002287, all three anti-clockwise
with the sea to the right, no holes, no duplicate nodes...

As far as I can tell, the only difference to the correctly rendering
coastline in the area is that in this tile, no coastline crosses tile
boundaries... In any of the tiles where there is any coastline crosses a
tile boundary, even the smaller entirely contained islands render correctly,
if there is no coastline crossing a tile boundary, they are rendering as
lakes...

d
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