Name
ST_ZMax — Returns the Z maxima of a 2D or 3D bounding box or a geometry.
Synopsis
float ST_ZMax(box3d aGeomorBox2DorBox3D);
Description
Returns the Z maxima of a 2D or 3D bounding box or a geometry.
![[Note]](../images/note.png)
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Although this function is only defined for box3d, it also works for box2d and geometry values due to automatic casting. However it will not accept a geometry or box2d text representation, since those do not auto-cast. |
This function supports 3d and will not drop the z-index.
This method supports Circular Strings and Curves.
Examples
Code
SELECT ST_ZMax('BOX3D(1 2 3,4 5 6)');
Output
6
Code
SELECT ST_ZMax('LINESTRING(1 3 4,5 6 7)'::geometry);
Output
7
Figure
Code
SELECT ST_ZMax('BOX3D(-3 2 1,3 4 1)');
Output
1
Observe THIS DOES NOT WORK because it will try to auto-cast the string representation to a BOX3D.
Code
SELECT ST_ZMax('LINESTRING(1 3 4,5 6 7)');
Output
ERROR: BOX3D parser - doesn't start with BOX3D(
Code
SELECT ST_ZMax('CIRCULARSTRING(220268 150415 1,220227 150505 2,220227 150406 3)'::geometry);
Output
3
Figure