GeoJSON オブジェクト

Overview

MongoDB supports the GeoJSON object types listed on this page.

GeoJSON データを指定するには、以下の埋め込みドキュメントを使用します。

• GeoJSON オブジェクト タイプを指定するtypeという名前を持つフィールド、

• オブジェクトの座標を指定する coordinates というフィールド。

<field>: { type: <GeoJSON type> , coordinates: <coordinates> }

GeoJSON オブジェクトに対する MongoDB の地理空間クエリは球体上で計算されます。MongoDB は、GeoJSON オブジェクトに対する地理空間クエリに WGS84 参照システムを使用します。

Point

The following example specifies a GeoJSON 点:

{ type: "Point", coordinates: [ 40, 5 ] }

LineString

The following example specifies a GeoJSON LineString:

{ type: "LineString", coordinates: [ [ 40, 5 ], [ 41, 6 ] ] }

Polygon

Polygons consist of an array of GeoJSON LinearRing coordinate arrays. These LinearRings are closed LineStrings. Closed LineStrings have at least four coordinate pairs and specify the same position as the first and last coordinates.

The line that joins two points on a curved surface may or may not contain the same set of co-ordinates that joins those two points on a flat surface. The line that joins two points on a curved surface will be a geodesic. Carefully check points to avoid errors with shared edges, as well as overlaps and other types of intersections.

{
  type: "Polygon",
  coordinates: [ [ [ 0 , 0 ] , [ 3 , 6 ] , [ 6 , 1 ] , [ 0 , 0  ] ] ]
}

Polygons with Multiple Rings

For Polygons with multiple rings:

• The first described ring must be the exterior ring.

• The exterior ring cannot self-intersect.

• Any interior ring must be entirely contained by the outer ring.

• Interior rings cannot intersect or overlap each other. Interior rings cannot share an edge.

The following example represents a GeoJSON polygon with an interior ring:

{
  type : "Polygon",
  coordinates : [
     [ [ 0 , 0 ] , [ 3 , 6 ] , [ 6 , 1 ] , [ 0 , 0 ] ],
     [ [ 2 , 2 ] , [ 3 , 3 ] , [ 4 , 2 ] , [ 2 , 2 ] ]
  ]
}

MultiPoint

Requires 2dsphere インデックス

GeoJSON MultiPoint embedded documents encode a list of points.

{
  type: "MultiPoint",
  coordinates: [
     [ -73.9580, 40.8003 ],
     [ -73.9498, 40.7968 ],
     [ -73.9737, 40.7648 ],
     [ -73.9814, 40.7681 ]
  ]
}

MultiLineString

Requires 2dsphere インデックス

The following example specifies a GeoJSON MultiLineString:

{
  type: "MultiLineString",
  coordinates: [
     [ [ -73.96943, 40.78519 ], [ -73.96082, 40.78095 ] ],
     [ [ -73.96415, 40.79229 ], [ -73.95544, 40.78854 ] ],
     [ [ -73.97162, 40.78205 ], [ -73.96374, 40.77715 ] ],
     [ [ -73.97880, 40.77247 ], [ -73.97036, 40.76811 ] ]
  ]
}

MultiPolygon

Requires 2dsphere インデックス

The following example specifies a GeoJSON MultiPolygon:

{
  type: "MultiPolygon",
  coordinates: [
     [ [ [ -73.958, 40.8003 ], [ -73.9498, 40.7968 ], [ -73.9737, 40.7648 ], [ -73.9814, 40.7681 ], [ -73.958, 40.8003 ] ] ],
     [ [ [ -73.958, 40.8003 ], [ -73.9498, 40.7968 ], [ -73.9737, 40.7648 ], [ -73.958, 40.8003 ] ] ]
  ]
}

GeometryCollection

Requires 2dsphere インデックス

The following example stores coordinates of GeoJSON type GeometryCollection:

{
  type: "GeometryCollection",
  geometries: [
     {
       type: "MultiPoint",
       coordinates: [
          [ -73.9580, 40.8003 ],
          [ -73.9498, 40.7968 ],
          [ -73.9737, 40.7648 ],
          [ -73.9814, 40.7681 ]
       ]
     },
     {
       type: "MultiLineString",
       coordinates: [
          [ [ -73.96943, 40.78519 ], [ -73.96082, 40.78095 ] ],
          [ [ -73.96415, 40.79229 ], [ -73.95544, 40.78854 ] ],
          [ [ -73.97162, 40.78205 ], [ -73.96374, 40.77715 ] ],
          [ [ -73.97880, 40.77247 ], [ -73.97036, 40.76811 ] ]
       ]
     }
  ]
}