[Tilesathome] Coastline and ocean leakage in Iceland

[Ævar Arnfjörð Bjarmason]

On Wed, Oct 1, 2008 at 8:46 PM, Rob Reid <rob at robreid.co.nz> wrote:
> Ævar Arnfjörð Bjarmason wrote the following on 02/10/2008 06:48:
>> A bunch of tiles covering Iceland are inappropriately either blue or
>> white squares on land or near the coast:
>>
>> http://openstreetmap.org/?lat=65.47&lon=-22.71&zoom=8&layers=0B00FTF
>>
>> This also happens inland:
>>
>> http://openstreetmap.org/?lat=65.396&lon=-14.227&zoom=9&layers=0B00FTF
>>
>> I can't see what the problem is, here's perhaps a better example where
>> an area of the ocean is rendered as if it's a landmass but there's no
>> island (or anything else but the ocean) in that area:
>>
>> http://openstreetmap.org/?lat=65.7839&lon=-23.8626&zoom=13&layers=0B00FTF
>>
>> What's the problem?
>>
> Osmarender uses a file called oceantiles_12.dat to establish if a tile
> at zoom 12 is ocean or land because when it is rendering it only has the
> data for that tile and so may not know where the nearest coastline is.
>
> Looking at your 3rd example the z12 tile in question is here :
> http://server.tah.openstreetmap.org/Browse/details/tile/12/1776/1044/
>
> Checking oceantiles for this tiles gives the following result showing it
> marked as a land tile :
>
>     ./png2tileinfo.pl check 1776 1044
>    oceantiles_12.png(1776, 1044) = 1 (*land*)
>
> If you run tilesAtHome you should already have the png2tileinfo
> directory which contain the tools for fixing this.
> If not you can check it out with svn from here :
> http://svn.openstreetmap.org/applications/rendering/png2tileinfo/
> And read the README for details on how to check/set tiles.
>
> To commit changes you will need an svn account.
>
> If that all seems a bit complicated let me know and I'll add Iceland to
> the places I've been doing oceantiles fixes for.

That doesn't sound complicated and at all, and thanks for explaining
what the problem is so that I can fix it :)

Whom do I contact for a SVN account so that I can commit fixes for Iceland?