bufferGeodeticOrNull

Creates a buffer polygon at the specified distance around the given geometry, calculated using a geodetic curve. Geodetic buffers account for the actual shape of the earth. Distances are calculated between points on a curved surface (the geoid) as opposed to points on a flat surface (the Cartesian plane).

Negative distance can be used to create a buffer inside a Polygon or an Envelope. Using a negative buffer distance shrinks the geometry's boundary by the distance specified. Note that if the negative buffer distance is large enough, the geometry may collapse to an empty polygon.