path.area()

path.area(object)

Returns the projected planar area (typically in square pixels) for the specified GeoJSON object. Point, MultiPoint, LineString and MultiLineString features have zero area. For Polygon and MultiPolygon features, this method first computes the area of the exterior ring, and then subtracts the area of any interior holes. This method observes any clipping performed by the projection; see projection.clipAngle and projection.clipExtent.