ST_Intersects

定義

ST_Intersects は、2 つのジオメトリのインターセクトが空のセットを生成しない場合は 1 (Oracle および SQLite) または t (PostgreSQL)、それ以外の場合は 0 (Oracle および SQLite) または f (PostgreSQL) を返します。

構文

Oracle および PostgreSQL

sde.st_intersects (geometry1 sde.st_geometry, geometry2 sde.st_geometry)

SQLite

st_intersects (geometry1 geometryblob, geometry2 geometryblob)

戻り値のタイプ

Boolean

例

消防部長は、有害廃棄物区域の範囲内にある保護区域のリストを必要としています。

保護区域は、sensitive_areas テーブルに格納されます。ポリゴンとして定義された shape 列は、各保護区域の外周を格納します。

有害区域は、hazardous_sites テーブルに格納されます。ポイントとして定義された site 列は、各有害区域の地理的な中心位置を格納します。

SELECT クエリは、各有害区域の周囲にバッファー範囲を作成し、有害区域のバッファーと交差する保護区域のリストを返します。

Oracle

--Create and populate tables.
CREATE TABLE sensitive_areas (
 id integer,
 shape sde.st_geometry
); 

CREATE TABLE hazardous_sites (
 id integer,
 site sde.st_geometry
);

INSERT INTO sensitive_areas VALUES (
 1,
 sde.st_geometry ('polygon ((20 30, 30 30, 30 40, 20 40, 20 30))', 4326)
);

INSERT INTO sensitive_areas VALUES (
 2,
 sde.st_geometry ('polygon ((30 30, 30 50, 50 50, 50 30, 30 30))', 4326)
);

INSERT INTO sensitive_areas VALUES (
 3,
 sde.st_geometry ('polygon ((40 40, 40 60, 60 60, 60 40, 40 40))', 4326)
);

INSERT INTO hazardous_sites VALUES (
 4,
 sde.st_geometry ('point (60 60)', 4326)
);

INSERT INTO hazardous_sites VALUES (
 5,
 sde.st_geometry ('point (30 30)', 4326)
);

--Create a buffer around the hazardous sites, then find the hazardous site buffers that intersect sensitive areas.
SELECT sa.id SA_ID, hs.id HS_ID
 FROM SENSITIVE_AREAS sa, HAZARDOUS_SITES hs
 WHERE sde.st_intersects (sde.st_buffer (hs.site, .1), sa.shape) = 1
 ORDER BY sa.id;

SA_ID      HS_ID

    1          5
    2          5
    3          4

PostgreSQL

--Create and populate tables.
CREATE TABLE sensitive_areas (
 id serial,
 shape sde.st_geometry
); 

CREATE TABLE hazardous_sites (
 id serial,
 site sde.st_geometry
);

INSERT INTO sensitive_areas (shape) VALUES (
 sde.st_geometry ('polygon ((20 30, 30 30, 30 40, 20 40, 20 30))', 4326)
);

INSERT INTO sensitive_areas (shape) VALUES (
 sde.st_geometry ('polygon ((30 30, 30 50, 50 50, 50 30, 30 30))', 4326)
);

INSERT INTO sensitive_areas (shape) VALUES (
 sde.st_geometry ('polygon ((40 40, 40 60, 60 60, 60 40, 40 40))', 4326)
);

INSERT INTO hazardous_sites (site) VALUES (
 sde.st_geometry ('point (60 60)', 4326)
);

INSERT INTO hazardous_sites (site) VALUES (
 sde.st_geometry ('point (30 30)', 4326)
);

--Create a buffer around the hazardous sites, then find the hazardous site buffers that intersect sensitive areas.
SELECT sa.id AS sid, hs.id AS hid
 FROM sensitive_areas sa, hazardous_sites hs
 WHERE sde.st_intersects (sde.st_buffer (hs.site, .1), sa.shape) = 't'
 ORDER BY sa.id;

sid     hid

  1       2
  2       2
  3       1

SQLite

--Create and populate tables.
CREATE TABLE sensitive_areas (
 id integer primary key autoincrement not null
); 

SELECT AddGeometryColumn (
 NULL,
 'sensitive_areas',
 'shape',
 4326,
 'polygon',
 'xy',
 'null'
);

CREATE TABLE hazardous_sites (
 id integer primary key autoincrement not null
);

SELECT AddGeometryColumn (
 NULL,
 'hazardous_sites',
 'site',
 4326,
 'point',
 'xy',
 'null'
);

INSERT INTO sensitive_areas (shape) VALUES (
 st_geometry ('polygon ((20 30, 30 30, 30 40, 20 40, 20 30))', 4326)
);

INSERT INTO sensitive_areas (shape) VALUES (
 st_geometry ('polygon ((30 30, 30 50, 50 50, 50 30, 30 30))', 4326)
);

INSERT INTO sensitive_areas (shape) VALUES (
 st_geometry ('polygon ((40 40, 40 60, 60 60, 60 40, 40 40))', 4326)
);

INSERT INTO hazardous_sites (site) VALUES (
 st_geometry ('point (60 60)', 4326)
);

INSERT INTO hazardous_sites (site) VALUES (
 st_geometry ('point (30 30)', 4326)
);

--Create a buffer around the hazardous sites, then find the hazardous site buffers that intersect sensitive areas.
SELECT sa.id AS "sid", hs.id AS "hid"
 FROM sensitive_areas sa, hazardous_sites hs
 WHERE st_intersects (st_buffer (hs.site, .1), sa.shape) = 1
 ORDER BY sa.id;

sid     hid

  1       2
  2       2
  3       1