Buffer operation

The buffer geometry operation takes each input vector shape and applies morphological  dilation or  erosion to it.

The buffer distance determines which operation to use:

• A positive distance dilates the shape (expands it).
• A negative distance erodes the shape (shrinks it).

Note: buffering always converts the input vector data into polygons.

Usage

The buffer operation is applied inside the features block, like so:

    <features name="shapes" driver="ogr">
        <url>data.shp</url>
        <buffer distance="0.02"/>
    </features>