PostgreSQL/PostGIS PL Functions for dealing with 4D Track Data

everynseconds.sql

CREATE OR REPLACE FUNCTION everynseconds(geometry, integer)
RETURNS geometry AS 
$BODY$
SELECT
  st_makeline(st_locate_along_measure($1,g)) 
FROM 
  generate_series(0,floor(st_m(st_endpoint($1)))::int,$2) g;
$BODY$
LANGUAGE sql;