There are always three choices of buffer modes. Depending on the type of study area (point, line, area), different ways of buffering can be done:
 From centroid
From centroid - the distance of the buffer will be done from the centroid of the study area.
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 From border
From border - the distance of the buffer will be measured from the outside border of the study area.
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 Inside Area
Inside area - the calculation will only be based in the inside of the study area.
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