Relations on Geometry Minimal Bounding Rectangles (MBRs)

MySQL provides several functions that test relations between minimal bounding rectangles of two geometries g1 and g2. The return values 1 and 0 indicate true and false, respectively.

• MBRContains(g1,g2)

  Returns 1 or 0 to indicate whether the Minimum Bounding Rectangle of g1 contains the Minimum Bounding Rectangle of g2. This tests the opposite relationship as MBRWithin().

  mysql> SET @g1 = GeomFromText('Polygon((0 0,0 3,3 3,3 0,0 0))');
  mysql> SET @g2 = GeomFromText('Point(1 1)');
  mysql> SELECT MBRContains(@g1,@g2), MBRContains(@g2,@g1);
  ----------------------+----------------------+
  | MBRContains(@g1,@g2) | MBRContains(@g2,@g1) |
  +----------------------+----------------------+
  | 1 | 0 |
  +----------------------+----------------------+
  

• MBRDisjoint(g1,g2)

  Returns 1 or 0 to indicate whether the Minimum Bounding Rectangles of the two geometries g1 and g2 are disjoint (do not intersect).

• MBREqual(g1,g2)

  Returns 1 or 0 to indicate whether the Minimum Bounding Rectangles of the two geometries g1 and g2 are the same.

• MBRIntersects(g1,g2)

  Returns 1 or 0 to indicate whether the Minimum Bounding Rectangles of the two geometries g1 and g2 intersect.

• MBROverlaps(g1,g2)

  Returns 1 or 0 to indicate whether the Minimum Bounding Rectangles of the two geometries g1 and g2 overlap. The term spatially overlaps is used if two geometries intersect and their intersection results in a geometry of the same dimension but not equal to either of the given geometries.

• MBRTouches(g1,g2)

  Returns 1 or 0 to indicate whether the Minimum Bounding Rectangles of the two geometries g1 and g2 touch. Two geometries spatially touch if the interiors of the geometries do not intersect, but the boundary of one of the geometries intersects either the boundary or the interior of the other.

• MBRWithin(g1,g2)

  Returns 1 or 0 to indicate whether the Minimum Bounding Rectangle of g1 is within the Minimum Bounding Rectangle of g2. This tests the opposite relationship as MBRContains().

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