説明

ST_Geometryについての要約文を返します．

この関数は三次元をサポートします．Zインデクスを削除しません．

例

SELECT ST_Summary(ST_GeomFromText('LINESTRING(0 0, 1 1)')) As good_line,
	ST_Summary(ST_GeomFromText('POLYGON((0 0, 1 1, 1 2, 1 1, 0 0))')) As bad_poly
--結果
	  good_line       |        bad_poly
----------------------+-------------------------
					  |
Line[B] with 2 points : Polygon[B] with 1 rings
					  :    ring 0 has 5 points
					  :

--三次元ポリゴン
SELECT ST_Summary(ST_GeomFromEWKT('LINESTRING(0 0 1, 1 1 1)')) As good_line,
	ST_Summary(ST_GeomFromEWKT('POLYGON((0 0 1, 1 1 2, 1 2 3, 1 1 1, 0 0 1))')) As poly

--結果
	  good_line       |        poly
----------------------+-------------------------
					  |
Line[ZB] with 2 points : Polygon[ZB] with 1 rings
					  :    ring 0 has 5 points
					  :

関連情報

ST_IsValid, ST_IsValidReason