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GeoJSON Objects¶
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Overview¶
MongoDB supports the GeoJSON object types listed on this page.
To specify GeoJSON data, use a document with a type field specifying the GeoJSON object type and a coordinates field specifying the object’s coordinates:
{ type: "<GeoJSON type>" , coordinates: <coordinates> }
重要
Always list coordinates in longitude, latitude order.
The default coordinate reference system for GeoJSON uses the WGS84 datum.
Point¶
2.4 新版功能.
The following example specifies a GeoJSON Point:
{ type: "Point", coordinates: [ 40, 5 ] }
LineString¶
2.4 新版功能.
The following example specifies a GeoJSON LineString:
{ type: "LineString", coordinates: [ [ 40, 5 ], [ 41, 6 ] ] }
Polygon¶
2.4 新版功能.
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.
Polygons with a Single Ring¶
The following example specifies a GeoJSON Polygon with an exterior ring and no interior rings (or holes). The first and last coordinates must match in order to close the polygon:
{
type: "Polygon",
coordinates: [ [ [ 0 , 0 ] , [ 3 , 6 ] , [ 6 , 1 ] , [ 0 , 0 ] ] ]
}
For Polygons with a single ring, the ring cannot self-intersect.
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¶
2.6 新版功能: Requires 2dsphere (Version 2)
GeoJSON MultiPoint <http://geojson.org/geojson-spec.html#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¶
2.6 新版功能: Requires 2dsphere (Version 2)
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¶
2.6 新版功能: Requires 2dsphere (Version 2)
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¶
2.6 新版功能: Requires 2dsphere (Version 2)
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 ] ]
]
}
]
}