Point coordinates are in x, y order (easting, northing for projected
coordinates, longitude, latitude for geographic coordinates).
The last point coordinate is implicitly connected with the first.
또한 보기:
Builder::geoWithinPolygon()
또한 보기:
Expr::withinPolygon()
또한 보기:
http://docs.mongodb.org/manual/reference/operator/polygon/
사용 중단:
1.1 MongoDB 2.4 deprecated $within in favor of $geoWithin