I need to find the highest point of a 3D line. To do so I use ST_ZMax to obtain the Z-coordinate of the highest point:

SELECT ST_ZMax(geom) FROM 3dlines;

How can I find the X- and Y-coordinates of this point?


2 ways to do it

1) use st_dumppoints and order by st_z

2) create a polygon above your linestring and use st_3dclosestpoint to find your highest point.

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select the point where z = ST_ZMax(geom)

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