Name
ST_InterpolatePoint — Returns the interpolated measure of a geometry closest to a point.
Synopsis
float8 ST_InterpolatePoint(geometry linear_geom_with_measure, geometry point);
Description
Returns an interpolated measure value of a linear measured geometry at the location closest to the given point.
![[Note]](../images/note.png)
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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.
Examples
Code
SELECT ST_InterpolatePoint( 'LINESTRING M (0 0 0,10 0 20)', 'POINT(5 5)');
Output
10
Figure