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You could use the r.buffer function. But it uses classes for the distance. r.buffer input=roads output=roads.buf distances=100,200,300,400,500 The result would be: roads roads.buf 000000000000000000000000 222233333333333333444444 111000000000000000000000 111222222222223333333333 000111111111100000000000 ...


You must make sure that the layers are in the same projection system.

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