Complete documentation,

Idea:

  foo.bbox "<<", other
  foo.bbox "@", other

  def strictly_left_of?(other)
  end

  def completely_contained_by?(other)
  end

These operators utilize indexes. They compare bounding boxes of 2 geometries

  A &< B (A overlaps or is to the left of B)
  A &> B (A overlaps or is to the r...

x ST_Dimension Return the dimension of the ST_Geometry value.

x ST_Boundary(geometry) Returns the closure of the combinatorial boundary of this Geometry. The co...

http://github.com/nofxx/postgis_...