LWGEOM_z_point()

Datum LWGEOM_z_point

(

PG_FUNCTION_ARGS

)

Definition at line 653 of file lwgeom_ogc.c.

{
        GSERIALIZED *geom;
        LWPOINT *point = NULL;
        LWGEOM *lwgeom;
        POINT3DZ p;
 
        geom = PG_GETARG_GSERIALIZED_P(0);
 
        if ( gserialized_get_type(geom) != POINTTYPE )
                lwpgerror("Argument to ST_Z() must be a point");
 
        lwgeom = lwgeom_from_gserialized(geom);
        point = lwgeom_as_lwpoint(lwgeom);
 
        if ( lwgeom_is_empty(lwgeom) )
                PG_RETURN_NULL();
 
        /* no Z in input */
        if ( ! gserialized_has_z(geom) ) PG_RETURN_NULL();
 
        getPoint3dz_p(point->point, 0, &p);
 
        PG_FREE_IF_COPY(geom, 0);
 
        PG_RETURN_FLOAT8(p.z);
}

References getPoint3dz_p(), gserialized_get_type(), gserialized_has_z(), lwgeom_as_lwpoint(), lwgeom_from_gserialized(), lwgeom_is_empty(), LWPOINT::point, POINTTYPE, and POINT3DZ::z.

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