ST_IsValidReason — ジオメトリが妥当か否かを示すテキストを返し、不正な場合は理由を返します。
text ST_IsValidReason(
geometry geomA)
;
text ST_IsValidReason(
geometry geomA, integer flags)
;
ジオメトリが妥当か否かを示すテキストを返し、不正な場合は理由を返します。
ST_IsValidと併用して、不正なジオメトリとその理由の細かい報告を生成するのに便利です。
許されるflags
は、ST_IsValidDetailにあります。
初出: 1.4 - requires GEOS >= 3.1.0.
初出: 2.0 - requires GEOS >= 3.3.0 flagsを受け付ける版
-- 試験に成功した5つのレコードを除いた最初の3つのレコード SELECT gid, ST_IsValidReason(the_geom) as validity_info FROM (SELECT ST_MakePolygon(ST_ExteriorRing(e.buff), ST_Accum(f.line)) As the_geom, gid FROM (SELECT ST_Buffer(ST_MakePoint(x1*10,y1), z1) As buff, x1*10 + y1*100 + z1*1000 As gid FROM generate_series(-4,6) x1 CROSS JOIN generate_series(2,5) y1 CROSS JOIN generate_series(1,8) z1 WHERE x1 > y1*0.5 AND z1 < x1*y1) As e INNER JOIN (SELECT ST_Translate(ST_ExteriorRing(ST_Buffer(ST_MakePoint(x1*10,y1), z1)),y1*1, z1*2) As line FROM generate_series(-3,6) x1 CROSS JOIN generate_series(2,5) y1 CROSS JOIN generate_series(1,10) z1 WHERE x1 > y1*0.75 AND z1 < x1*y1) As f ON (ST_Area(e.buff) > 78 AND ST_Contains(e.buff, f.line)) GROUP BY gid, e.buff) As quintuplet_experiment WHERE ST_IsValid(the_geom) = false ORDER BY gid LIMIT 3; gid | validity_info ------+-------------------------- 5330 | Self-intersection [32 5] 5340 | Self-intersection [42 5] 5350 | Self-intersection [52 5] -- 単純なものの例 SELECT ST_IsValidReason('LINESTRING(220227 150406,2220227 150407,222020 150410)'); st_isvalidreason ------------------ Valid Geometry