The lower corner of an envelope (min x,y and, optionally, z) lowerCorner The upper corner of an envelope (max x,y and, optionally, z) upperCorner a property for associating a bathing water with some thing. bathingWater A property for associating a spatial reference system with a Geometry srs A property for associating a number (typically 1-3) of coordinate dimensions with a Geometry dimensions 1 10 0