[OSM-talk] strange gaps filled by water at zoomlevel 18

[Pavel Melnikov]

 Hello again everybody!
I'm continuing exploration about that water bug, and I've found the limit
of that effect, which is a huge 200km*2000km rectangle :
http://www.openstreetmap.org/?box=yes&bbox=81.23549%2C54.060041%2C85.627667%2C68.841992
Some edge pictures are:
East
http://www.openstreetmap.org/?lat=55.27545&lon=85.627667&zoom=18&layers=M
South
http://www.openstreetmap.org/?lat=54.08514&lon=83.40566&zoom=18&layers=M
West
http://www.openstreetmap.org/?lat=58.858448&lon=81.23549&zoom=18&layers=M
North
http://www.openstreetmap.org/?lat=68.841992&lon=82.550755&zoom=18&layers=M
I've found no strange geometry at the edges of the rectangle, and the edges
do not always coinside with tiles edges (see this for example:
http://b.tile.openstreetmap.org/18/190225/73869.png)

So the problem affects not only my city, but a huge 2000x200km area, and I
have no idea how to locate the error. Any suggestions here?


On Thu, Mar 7, 2013 at 2:17 PM, Pavel Melnikov <positron96 at gmail.com> wrote:

> Hello fellow osmers!
>
> I've been looking at my local area on osm at zoomlevel 18, and it appears
> thast someone broke something, or that something broke on its
> own) Specifically, all areas that are not tagged have become filled with
> water:
> http://www.openstreetmap.org/?lat=54.843997&lon=83.061967&zoom=18&layers=M.
> At lower zoomlevels it is all good, ground is where it should be.
> http://www.openstreetmap.org/?lat=54.84377&lon=83.06238&zoom=17&layers=M.
> Water stretches pretty far from where it should be, at least some 10 km
> from Ob reservoir is still filled with water (
> http://www.openstreetmap.org/?lat=54.827715&lon=83.196056&zoom=18&layers=M
> ).
>
> I believe it broke recently, because there were some correct
> (ground-filled) tiles at zoomlevel 18, and they were generated back in Jan
> or Feb, now  when I'm recreating them, they get filled with water.
>
> Can anyone help me with the direction to dig for a problem? Is it some
> tagging mistake, or broken polygon? How do I locate it?
>
> Best wishes,
>   Pavel.
>
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