[Qgis-user] Buffer with qgis : wgs84/mercator world?

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Hello,

Thank you for your reply. But sorry i do not really understand. Could you
make explicit please? 

What do you understand by 'geography'? 

I just make a new test with world mercator & wgs84 also and the result of
the buffers are always big circle . So i suppose that the unity is
radians/degrés...

My raw linear shp is very long. It is a corridor from Berlin to Beijing.
According to you, which coordinate system i should select in order to
generate a buffer (20kms)? 

Thank you. 



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