Polygon Geometry Object
https://tools.ietf.org/html/rfc7946#section-3.1.6
Optional
Bounding box of the coordinate range of the object's Geometries, Features, or Feature Collections. https://tools.ietf.org/html/rfc7946#section-5
Specifies the type of GeoJSON object.
Polygon Geometry Object
https://tools.ietf.org/html/rfc7946#section-3.1.6