カテゴリ:

地理空間関数

ST_COVERS

This returns TRUE if no point in one geospatial object is outside of another geospatial object. In other words:

  • GEOGRAPHY object g2 is outside GEOGRAPHY object g1.

  • GEOMETRY object g2 is outside GEOMETRY object g1.

ST_COVERS は、 ST_CONTAINS と似ていますが、微妙に異なります。「カバー」と「含む」の違いの詳細については、 次元拡張9交差点モデル(DE-9IM) をご参照ください。

Although ST_COVERS and ST_CONTAINS might seem similar, the two functions have subtle differences. For details on the differences between "covers" and "contains", see the Dimensionally Extended 9-Intersection Model (DE-9IM).

注釈

この関数は、入力値として GeometryCollection または FeatureCollection を使用することをサポートしていません。

こちらもご参照ください。

ST_CONTAINS , ST_COVEREDBY

構文

ST_COVERS( <geography_expression_1> , <geography_expression_2> )

ST_COVERS( <geometry_expression_1> , <geometry_expression_2> )

引数

geography_expression_1

GeometryCollection または FeatureCollection ではない GEOGRAPHY オブジェクト。

geography_expression_2

GeometryCollection または FeatureCollection ではない GEOGRAPHY オブジェクト。

geometry_expression_1

A GEOMETRY object that is not a GeometryCollection or FeatureCollection.

geometry_expression_2

A GEOMETRY object that is not a GeometryCollection or FeatureCollection.

戻り値

BOOLEAN

Usage Notes

  • For GEOMETRY objects, the function reports an error if the two input GEOMETRY objects have different SRIDs.

GEOGRAPHY Examples

これは、 ST_COVERS 関数の簡単な使用法を示しています。

create table geospatial_table_01 (g1 GEOGRAPHY, g2 GEOGRAPHY);
insert into geospatial_table_01 (g1, g2) values 
    ('POLYGON((0 0, 3 0, 3 3, 0 3, 0 0))', 'POLYGON((1 1, 2 1, 2 2, 1 2, 1 1))');
SELECT ST_COVERS(g1, g2) 
    FROM geospatial_table_01;
+-------------------+
| ST_COVERS(G1, G2) |
|-------------------|
| True              |
+-------------------+

GEOMETRY Examples

The query below shows several examples of using ST_COVERS. Note how the Polygon covers (but does not contain) a LineString on its border.

SELECT ST_COVERS(poly, poly_inside),
       ST_COVERS(poly, poly),
       ST_COVERS(poly, line_on_boundary),
       ST_COVERS(poly, line_inside)
  FROM (SELECT TO_GEOMETRY('POLYGON((-2 0, 0 2, 2 0, -2 0))') AS poly,
               TO_GEOMETRY('POLYGON((-1 0, 0 1, 1 0, -1 0))') AS poly_inside,
               TO_GEOMETRY('LINESTRING(-1 1, 0 2, 1 1)') AS line_on_boundary,
               TO_GEOMETRY('LINESTRING(-2 0, 0 0, 0 1)') AS line_inside);
+------------------------------+----------------------+----------------------------------+-----------------------------+
| ST_COVERS(POLY, POLY_INSIDE) | ST_COVERS(POLY,POLY) | ST_COVERS(POLY,LINE_ON_BOUNDARY) | ST_COVERS(POLY,LINE_INSIDE) |
|------------------------------+----------------------+----------------------------------+-----------------------------|
| True                         | True                 | True                             | True                        |
+------------------------------+----------------------+----------------------------------+-----------------------------+
最上部に戻る