ST_LineFromEncodedPolyline — Crea un LineString desde una polilínea codificada.
geometry ST_LineFromEncodedPolyline(text polyline, integer precision=5);
Crea un LineString desde una cadena de polilínea codificada.
Optional precision specifies how many decimal places will be preserved in Encoded Polyline. Value should be the same on encoding and decoding, or coordinates will be incorrect.
Ver http://developers.google.com/maps/documentation/utilities/polylinealgorithm
Disponibilidad: 2.2.0
-- Create a line string from a polyline
SELECT ST_AsEWKT(ST_LineFromEncodedPolyline('_p~iF~ps|U_ulLnnqC_mqNvxq`@'));
-- result --
SRID=4326;LINESTRING(-120.2 38.5,-120.95 40.7,-126.453 43.252)
-- Select different precision that was used for polyline encoding
SELECT ST_AsEWKT(ST_LineFromEncodedPolyline('_p~iF~ps|U_ulLnnqC_mqNvxq`@',6));
-- result --
SRID=4326;LINESTRING(-12.02 3.85,-12.095 4.07,-12.6453 4.3252)