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18.5.5. 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.

    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.

  • MBRTouches(g1,g2)

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

  • MBRWithin(g1,g2)

    Returns 1 or 0 to indicate whether the Minimum Bounding Rectangle of g1 is within the Minimum Bounding Rectangle of g2.

    mysql> SET @g1 = GeomFromText('Polygon((0 0,0 3,3 3,3 0,0 0))');
    mysql> SET @g2 = GeomFromText('Polygon((0 0,0 5,5 5,5 0,0 0))');
    mysql> SELECT MBRWithin(@g1,@g2), MBRWithin(@g2,@g1);
    +--------------------+--------------------+
    | MBRWithin(@g1,@g2) | MBRWithin(@g2,@g1) |
    +--------------------+--------------------+
    |                  1 |                  0 |
    +--------------------+--------------------+
    

 
 
  Published under the terms of the GNU General Public License Design by Interspire