MongoDB

1 概要

1. MongoDB支持空间数据的存储，不过限制了类型必须为GeoJSON。
2. MongoDB可以满足一些空间查询的需求，对于不需要空间数据处理的项目极为方便，不需要第三方库来充当空间数据的操作层。
3. MongoDB可以为GeoJSON类型数据建立索引，提升空间查询的效率。

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2 MongoDB支持GeoJSON的种类

1.点(Point)

{  "name": "玉泉路站",  "locaton": {    "type": "Point",    "coordinates": [116.25947, 39.913501]  }}

2.线(LineString)

{  "name": "地铁1号线",  "geom": {    "type": "LineString",    "coordinates": [      [ 116.184378, 39.932476 ],      [ 116.259470, 39.913501 ],      [ 116.522347, 39.914943 ]    ]  }}

3.面(Polygon)
注意：首末点坐标相同

{  "name": "镂空多边形",  "geom": {    "type": "Polygon",    "coordinates": [      [[ 0 , 0 ] , [ 3 , 6 ] , [ 6 , 1 ] , [ 0 , 0 ]],      [[ 2 , 2 ] , [ 3 , 3 ] , [ 4 , 2 ] , [ 2 , 2 ]]    ]  }}

4.多点(MultiPoint)

{  "name": "1号线站点",  "locaton": {    "type": "MultiPoint",    "coordinates": [      [116.259470, 39.913501],      [116.280423, 39.913833],      [116.301550, 39.913710]    ]  }}

5.多线(MultiLineString)

{  "name": "地铁线路",  "geom": {    "type": "MultiLineString",    "coordinates": [      [[ 116.184378, 39.932476 ],[ 116.259470, 39.913501 ],[ 116.522347, 39.914943 ]],      [[ 25, 60 ], [ 11, 22 ], [ 44, 55 ]],      [[ 0, 0 ], [ 50, 50 ]]    ]  }}

6.多面(MultiPolygon)

{  "name": "多面",  "geom": {    "type": "MultiPolygon",    "coordinates": [      [[[ 0, 0 ], [ 3, 6 ], [ 6, 1 ], [ 0, 0 ]]],      [[[ 1, 1], [ 2, 1], [ 2, 2 ], [ 1, 2 ], [ 1, 1 ]]]    ]  }}

7.几何集合(GeometryCollectionn)

{  "type":"GeometryCollection",  "geometries":[    {      "type":"MultiPoint",      "coordinate":[        [116.259470, 39.913501],        [116.280423, 39.913833],        [116.301550, 39.913710]      ]    },    {      "type":"MultiPolygon",      "coordinate":[        [[[ 0, 0 ], [ 3, 6 ], [ 6, 1 ], [ 0, 0 ]]],        [[[ 1, 1], [ 2, 1], [ 2, 2 ], [ 1, 2 ], [ 1, 1 ]]]      ]    }  ]}