Re: [OSM-talk] Taiwan coastline problem

[Jon Burgess]

On Thu, 2008-10-02 at 11:05 +0800, Louis Liu wrote:
 Hi,
 
 Costline of southern Taiwan in mapnik is broken when zoom level = 9.
 But it's fine when zoom level is =10.
 Compare
 http://openstreetmap.org/?lat=22.31lon=121.16zoom=9layers=B000FTF
 and
 http://openstreetmap.org/?lat=22.24lon=120.722zoom=10layers=B000FTF

I'm afraid this is a problem with the tools used to generate the lower
zoom coastline outlines. There are issues elsewhere when it causes of
small squares of sea to appear:

http://openstreetmap.org/?lat=31.05lon=85.89zoom=6layers=B000FTF

For zoom 10+ the tools use a different set of parameters which work more
reliably but cause other issues at low zooms.

I'm trying to figure out why this is happening but do not have a fix
yet.

Jon



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[OSM-talk] Taiwan coastline problem

[Louis Liu]

Hi,

Costline of southern Taiwan in mapnik is broken when zoom level = 9.
But it's fine when zoom level is =10.
Compare
http://openstreetmap.org/?lat=22.31lon=121.16zoom=9layers=B000FTF
and
http://openstreetmap.org/?lat=22.24lon=120.722zoom=10layers=B000FTF

The situation is worse in osmarender:
http://www.informationfreeway.org/?lat=22.35415640178388lon=120.66263510229935zoom=11layers=BF000F

What can we do to fix it?

Cheers.
-- 
Louis Liu

OSM TW
http://OpenStreetMap.tw/

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