[Talk-us] Fwd: Lake Winnepesaki rendering issue

David ``Smith'' vidthekid at gmail.com
Tue Oct 13 09:53:10 BST 2009

On Mon, Oct 12, 2009 at 7:29 PM, Andrew Sawyer <assawyer at gmail.com> wrote:
> Thanks for taking a look.  On the Information Freeway site it still shows a
> rendering issue. I notice that the Mapnik layer was getting changes faster.
> I tried manually forcing a rerender via the site, but nothing substantial
> has changed. Should the islands not have natural:land? Does t at h not like
> that tag?
> I am glad it doesn't appear that I made an editing error.  I posted my
> original e-mail to the t at h list. Hopefully someone over there can lend their
> expertise. Is there a lot of data behinds the scene that affects the
> rendering, but the typical user cant see?

I notice that the parts of the map that don't render the lake right
happen to be specific map tiles at zoom 12.  A T at H client will
download a chunk of OSM data that's supposed to be enough information
to correctly draw a zoom-12 tile and all of the closer zoom levels for
the same area.  This looks to me like, for a couple of tiles, the
chunk of data that gets downloaded is not sufficient to correctly
describe the lake.  This is due to the large size of the lake and the
way T at H selects the data to be downloaded.

Here's a wild guess: what if those tiles are ordered re-rendered as
"ocean" tiles?  That might work, or it might require the outer ways of
the lake to be tagged natural=coastline.  I have a knack for guessing
how things work, but I'm still just guessing.

David "Smith"
a.k.a. Vid the Kid
a.k.a. Bír'd'in

Does this font make me look fat?

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