[postgis-users] creating a mask

[erik]

Hello,

I don't know if the terminology I use is correct but I would like to create
a mask of layer I have.
For example, from the shape of the world I would like to keep only the
oceans, the negative of the initial shape.
I haven't found any info or documentation about this. Can this be done in
PostGIS?

Many thanks!

Erik
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