Temporal count

tCount(tnpoint) → {tintSeq,tintSeqSet}

WITH Temp(temp) AS (
  SELECT tnpoint '[NPoint(1, 0.1)@2001-01-01, NPoint(1, 0.3)@2001-01-03)' UNION
  SELECT tnpoint '[NPoint(1, 0.2)@2001-01-02, NPoint(1, 0.4)@2001-01-04)' UNION
  SELECT tnpoint '[NPoint(1, 0.3)@2001-01-03, NPoint(1, 0.5)@2001-01-05)' )
SELECT tCount(Temp)
FROM Temp;
-- {[1@2001-01-01, 2@2001-01-02, 1@2001-01-04, 1@2001-01-05)}

Window count

wCount(tnpoint) → {tintSeq,tintSeqSet}

WITH Temp(temp) AS (
  SELECT tnpoint '[NPoint(1, 0.1)@2001-01-01, NPoint(1, 0.3)@2001-01-03)' UNION
  SELECT tnpoint '[NPoint(1, 0.2)@2001-01-02, NPoint(1, 0.4)@2001-01-04)' UNION
  SELECT tnpoint '[NPoint(1, 0.3)@2001-01-03, NPoint(1, 0.5)@2001-01-05)' )
SELECT wCount(Temp, '1 day')
FROM Temp;
/* {[1@2001-01-01, 2@2001-01-02, 3@2001-01-03, 2@2001-01-04, 1@2001-01-05,
   1@2001-01-06)} */

Temporal centroid

tCentroid(tnpoint) → tgeompoint

WITH Temp(temp) AS (
SELECT tnpoint '[NPoint(1, 0.1)@2001-01-01, NPoint(1, 0.3)@2001-01-03)' UNION
SELECT tnpoint '[NPoint(1, 0.2)@2001-01-01, NPoint(1, 0.4)@2001-01-03)' UNION
SELECT tnpoint '[NPoint(1, 0.3)@2001-01-01, NPoint(1, 0.5)@2001-01-03)' )
SELECT astext(tCentroid(Temp))
FROM Temp;
/* {[POINT(72.451531682218 76.5231414472853)@2001-01-01,
   POINT(55.7001249027598 72.9552602410653)@2001-01-03)} */