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:
![1](drex_bullet_1_2.png) From centroid
From centroid - the distance of the buffer will be done from the centroid of the study area.
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![2](drex_bullet_2_2.png) From border
From border - the distance of the buffer will be measured from the outside border of the study area.
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![3](drex_bullet_3_2.png) Inside Area
Inside area - the calculation will only be based in the inside of the study area.
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