The temporal pose type tpose allows to represent the evolution in time of the position of objects and their orientation. As all temporal types, it comes in three subtypes, namely, instant, sequence, and sequence set. Examples of tpose values in these subtypes are given next.

SELECT tpose 'Pose(Point(1 1), 0.5)@2001-01-01';
SELECT tpose '{Pose(Point(1 1), 0.3)@2001-01-01, Pose(Point(1 1), 0.5)@2001-01-02,
  Pose(Point(1 1), 0.5)@2001-01-03}';
SELECT tpose '[Pose(Point(1 1), 0.2)@2001-01-01, Pose(Point(1 1), 0.4)@2001-01-02,
  Pose(Point(1 1), 0.5)@2001-01-03]';
SELECT tpose '{[Pose(Point(1 1), 1)@2001-01-01, Pose(Point(2 2), 1)@2001-01-02],
  [Pose(Point(2 2), 2)@2001-01-04, Pose(Point(2 2), 3)@2001-01-05]}';

As for temporal point types, the temporal pose type accepts type modifiers (or typmod in PostgreSQL terminology) to specify the subtype, the dimensionality of the point, and/or the spatial reference identifier (SRID). The possible values for the subtype are Instant, Sequence, and SequenceSet and the possible values for the geometry type are either Point or PointZ. The three arguments are optional and if any of them is not specified for a column, values of any subtype, dimensionality, and/or SRID are allowed.

SELECT asEWKT(tpose(Sequence,5676) 'SRID=5676;[Pose(Point(1 1), 0.2)@2001-01-01, 
  Pose(Point(1 1), 0.5)@2001-01-03]');
-- SRID=5676;[Pose(POINT(1 1),0.2)@2001-01-01, Pose(POINT(1 1),0.5)@2001-01-03]
SELECT tpose(Sequence) 'Pose(Point(1 1), 0.2)@2001-01-01';
-- ERROR: Temporal type (Instant) does not match column type (Sequence)
SELECT tpose(PointZ) 'Pose(Point(1 1), 0.2)@2001-01-01';
-- Column has Z dimension but the tpose value does not
SELECT tpose(5676) 'Pose(Point(1 1), 0.2)@2001-01-01';
-- ERROR:  Temporal pose SRID (0) does not match column SRID (5676)

Temporal pose values of sequence or sequence set subtype are converted into a normal form so that equivalent values have identical representations. For this, consecutive instant values are merged when possible. Three consecutive instant values can be merged into two if the linear functions defining the evolution of values are the same. Examples of transformation into a normal form are as follows.

SELECT asText(tpose '[Pose(Point(1 1), 0.2)@2001-01-01,
  Pose(Point(2 2), 0.4)@2001-01-02, Pose(Point(3 3), 0.6)@2001-01-03)');
-- [Pose(Point(1 1),0.2)@2001-01-01, Pose(Point(3 3),0.6)@2001-01-03)
SELECT asText(tpose '{[Pose(Point(1 1), 0.2)@2001-01-01, 
  Pose(Point(2 2), 0.3)@2001-01-02, Pose(Point(2 2), 0.5)@2001-01-03), 
  [Pose(Point(2 2), 0.5)@2001-01-03, Pose(Point(2 2), 0.7)@2001-01-04)}');
/* {[Pose(Point(1 1),0.2)@2001-01-01, Pose(Point(2 2),0.3)@2001-01-02, 
   Pose(Point(2 2),0.7)@2001-01-04)} */