ST_Distance
Determine the minimum distance between two geometries.
Syntax
ST_Distance(geo1, geo2[, unit/varname>[, intersectTest]]);
- geo1
- The first input point or segment.
Type: ST_GEOMETRY(ANY)
- geo2
- The second input point or segment.
Type: ST_GEOMETRY(ANY)
- unit
- The units of the distance. Possible values include 'meter', 'kilometer', 'foot', 'mile', and
"nautical mile'.
Type: VARCHAR(ANY)
Default: 'meter'
- intersectTest
- If set to TRUE, test for intersection between the input geometries and return 0 if they do.
Otherwise, calculate the distance between the geometries.
Type: BOOL
Default: TRUE
Returns
A value of type DOUBLE indicating the minimum distance between two the two input points or segments.
Examples
SELECT inza..ST_Distance(inza..ST_Point(0, 0, 27700), inza..ST_Point(1, 0, 27700));
ST_DISTANCE
-------------
1
(1 row)
SELECT inza..ST_Distance(inza..ST_Point(0, 0, 27700),inza..ST_Point(1, 0, 27700), 'foot');
ST_DISTANCE
-----------------
3.2808398950131
(1 row)
SELECT inza..ST_Distance(inza..ST_Transform(inza..ST_Point(0, 0,27700), 4326), inza..ST_Transform(inza..ST_Point(1, 0, 27700), 4326), 'meter');
ST_DISTANCE
------------------
0.99836324443601
(1 row)