ST_InterpolatePoint — Returns the interpolated measure of a geometry closest to a point.
float8 ST_InterpolatePoint(
geometry linear_geom_with_measure, geometry point)
;
Returns an interpolated measure value of a linear measured geometry at the location closest to the given point.
Use this function only for linear geometries with an M component |
Availability: 2.0.0
This function supports 3d and will not drop the z-index.
SELECT ST_InterpolatePoint('LINESTRING M (0 0 0, 10 0 20)', 'POINT(5 5)'); --------------------- 10