描述

以投影单位（空间参考单位）返回两个几何体之间的 3 维笛卡尔最大距离。

此函数支持 3d，不会删除 z 索引。

此函数支持多面体表面。

可用性：2.0.0

已更改：2.2.0 - 对于 2D 和 3D，不再假定缺少 Z 时 Z 为 0。

示例

-- Geometry example - units in meters (SRID: 2163 US National Atlas Equal area) (3D point and line compared 2D point and line)
-- Note: currently no vertical datum support so Z is not transformed and assumed to be same units as final.
SELECT ST_3DMaxDistance(
			ST_Transform(ST_GeomFromEWKT('SRID=4326;POINT(-72.1235 42.3521 10000)'),2163),
			ST_Transform(ST_GeomFromEWKT('SRID=4326;LINESTRING(-72.1260 42.45 15, -72.123 42.1546 20)'),2163)
		) As dist_3d,
		ST_MaxDistance(
			ST_Transform(ST_GeomFromEWKT('SRID=4326;POINT(-72.1235 42.3521 10000)'),2163),
			ST_Transform(ST_GeomFromEWKT('SRID=4326;LINESTRING(-72.1260 42.45 15, -72.123 42.1546 20)'),2163)
		) As dist_2d;

     dist_3d      |     dist_2d
------------------+------------------
 24383.7467488441 | 22247.8472107251

另请参阅

ST_Distance、ST_3DDWithin、ST_3DMaxDistance、ST_Transform