Rectangular area in a spherical coordinate system (for example, WGS84). This structure is not tied to a specific geodesic coordinate system.
Checks the rectangle for validity.
Checks the rectangle for degeneracy. If the points in the rectangle are equal, then it degenerates to a point. A degenerate rectangle is a valid rectangle. An invalid rectangle is not degenerate.
Southwest point, lower-left border of the rectangle.
Northeast point, upper-right border of the rectangle.