Hello,
while experimenting with Mapnik and Jochen Topf's new ocean and land
polygons from http://openstreetmapdata.com I ran into the same problem I
first encountered using Mapserver as well.
Here is how this looks like:
http://home.geggus.net/pub/artifacts.png
In reccent Versions of mapserver this can be fixed using a lower gamma value
in AGG: see https://twitter.com/tbonfort/status/93284998249066496
Is there an equivalent in mapnik?
Here is the style I use:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE Map>
<Map background-color="#579ae3" srs="+init=epsg:3857" minimum-version="2.0.0">
<Style name="land">
<Rule>
<PolygonSymbolizer fill="#f2efe9"/>
</Rule>
</Style>
<Layer name="land" status="on" srs="+init=epsg:3857">
<StyleName>land</StyleName>
<Datasource>
<Parameter name="type">shape</Parameter>
<Parameter name="file"><path>/<to>/<openstreetmapdata.com>/<shapefile>/land_polygons</ Parameter>
</Datasource>
</Layer>
</Map>
Regards
Sven
--
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