Return the total length traversed by the centroid, or its cumulative length over time

length(trgeometry) → float
cumulativeLength(trgeometry) → tfloat

SELECT length(trgeometry 'Polygon((0 0,1 0,1 1,0 1,0 0));
  [Pose(Point(0 0),0)@2001-01-01, Pose(Point(3 4),0)@2001-01-02]');
-- 5

Return the speed of the centroid as a temporal float

speed(trgeometry) → tfloat

SELECT speed(trgeometry 'Polygon((0 0,1 0,1 1,0 1,0 0));
  [Pose(Point(0 0), 0.0)@2001-01-01, Pose(Point(10 0), 0.0)@2001-01-02]');
-- Interp=Step;[0.000115740740741@2001-01-01, 0.000115740740741@2001-01-02]

Return the angular speed as a temporal float

angularSpeed(trgeometry) → tfloat

The shape of a rigid geometry never changes, so its angular speed is the angular speed of the pose that carries it, in radians per unit time.

SELECT asText(angularSpeed(trgeometry 'Polygon((0 0,1 0,1 1,0 1,0 0));
  [Pose(Point(0 0),0)@2001-01-01, Pose(Point(0 0),1)@2001-01-02]'));
-- Interp=Step;[0.000011574074074@2001-01-01, 0.000011574074074@2001-01-02]

Return the time-weighted centroid of the centroid trajectory as a geometry

twCentroid(trgeometry) → geometry

SELECT ST_AsText(twCentroid(trgeometry 'Polygon((0 0,1 0,1 1,0 1,0 0));
  [Pose(Point(0 0),0)@2001-01-01, Pose(Point(3 4),0)@2001-01-02]'));
-- POINT(1.5 2)