Description

	Returns the 2-dimensional maximum distance between two geometries in projected units. If g1 and g2 is the same geometry the function will return the distance between the two vertices most far from each other in that geometry.

Availability: 1.5.0

Examples

Basic furthest distance the point is to any part of the line

postgis=# SELECT ST_MaxDistance('POINT(0 0)'::geometry, 'LINESTRING ( 2 0, 0 2 )'::geometry);
   st_maxdistance
-----------------
 2
(1 row)

postgis=# SELECT ST_MaxDistance('POINT(0 0)'::geometry, 'LINESTRING ( 2 2, 2 2 )'::geometry);
  st_maxdistance
------------------
 2.82842712474619
(1 row)

See Also

ST_Distance, ST_LongestLine, ST_DFullyWithin