[OSM-dev] How to make inverted coastlines?

[Ayahnya Fathimah]

Hi,

I tried to follow the tutorial
http://wiki.openstreetmap.org/wiki/Hillshading_with_Mapnik

But this process also affect the ocean ... which I want to avoid.

I read in
http://lists.berlios.de/pipermail/mapnik-users/2010-January/002793.html that
inverted coastlines should be used to achieve it.

Any hints how to make it?

thanks.
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