bufferGeodeticCollection static method

Creates and returns a geodetic buffer or buffers relative to the given collection of geometries.

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 buffers inside polygons. Using a negative buffer distance shrinks the polygons' boundaries by the distance specified. Note that if the negative buffer distance is large enough, polygons may collapse to empty geometries.

Parameters:

• geometries — A collection of geometries.
• distances — The distance to buffer each geometry, expressed as a List of double. If the size of the distances array is less than the number of geometries, the last distance value is used for the rest of geometries.
• distanceUnit — The unit of measure for the distance.
• maxDeviation — The maximum deviation between points. If NaN then a maximum deviation of up to 0.2% of the buffer distance, with a maximum of 0.01 meters, aiming to give an output geometry with a smooth boundary.
• curveType — The GeodeticCurveType used to calculate the buffer.
• unionResult — Return a single geometry that buffers all the geometries (true), or one buffer for each in the given collection (false).

Return Value: A collection of polygon geometries that represent a geodetic buffer at the desired distance(s) relative to the given geometries. If 'unionResult' is true, the resulting collection contains a single polygon. If geometries is empty, returns an empty array.