ST_Azimuth — Returns the north-based azimuth of a line between two points.
float ST_Azimuth(geometry origin, geometry target
float ST_Azimuth(geography origin, geography target
Returns the azimuth in radians of the target point from the origin point, or NULL if the two points are coincident. The azimuth angle is a positive clockwise angle referenced from the positive Y axis (geometry) or the North meridian (geography): North = 0; Northeast = π/4; East = π/2; Southeast = 3π/4; South = π; Southwest 5π/4; West = 3π/2; Northwest = 7π/4.
For the geography type, the azimuth solution is known as the inverse geodesic problem.
The azimuth is a mathematical concept defined as the angle between a reference vector and a point, with angular units in radians.
The result value in radians can be converted to degrees using the PostgreSQL function
Azimuth can be used in conjunction with ST_Translate to shift an object along its perpendicular axis. See
upgis_lineshift() function in the PostGIS wiki for an implementation of this.
Enhanced: 2.0.0 support for geography was introduced.
Enhanced: 2.2.0 measurement on spheroid performed with GeographicLib for improved accuracy and robustness. Requires PROJ >= 4.9.0 to take advantage of the new feature.
Geometry Azimuth in degrees
SELECT degrees(ST_Azimuth( ST_Point(25, 45), ST_Point(75, 100))) AS degA_B, degrees(ST_Azimuth( ST_Point(75, 100), ST_Point(25, 45) )) AS degB_A; dega_b | degb_a ------------------+------------------ 42.2736890060937 | 222.273689006094
ST_Angle, ST_Point, ST_Translate, ST_Project, PostgreSQL Math Functions