ST_Z
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Name

ST_Z — Returns the Z coordinate of a Point.

Synopsis

float ST_Z(geometry a_point);

Descrição

Retorna a coordenada Z do ponto, ou NULA se não estiver disponível. Entrada deve ser um ponto.

[Note]

To get the minimum and maximum Z value of geometry coordinates use the functions ST_ZMin and ST_ZMax.

This method implements the SQL/MM specification.

This function supports 3d and will not drop the z-index.

Exemplos

SELECT ST_Z(ST_GeomFromEWKT('POINT(1 2 3 4)'));
 st_z
------
        3
(1 row)