关于mongodb:mongodb-geoNear-使用记录

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须要，查问一个坐标点的左近地位

能够用数组或者 geojson 的模式

<field>: [<x>, <y>]
<field>: [<longitude>, <latitude>]

GeoJSON

location: {
      type: "Point",
      coordinates: [-73.856077, 40.848447]
}

先列出经度，而后再列出纬度

比方 loc 字段

  {
    "city": "北京市",
    "geo_id": 565932,
    "geo_name": "万柳园 (长春堂药店)",
    "lat": 39.850201868495773283,
    "lng": 116.33426020654366084,
    "loc": "[116.33426020654366084,39.850201868495773283]",
    "status": 0
 }

创立 2dsphere 索引

2dsphere 索引反对查问球面几何实体对象

db.collection.createIndex({ <location field> : "2dsphere"} )

pymongo 查问例子

        lng = geo['lng']
        lat = geo['lat']
        result = geos_collection.aggregate([
            {"$geoNear": { 
                "near": { 
                    "type": "Point",
                    "coordinates": [lng, lat] }, 
                    "distanceField": "distance", 
                    "maxDistance": 2000, 
                    "query": {"status": -1}, 
                    "spherical": True }
            },
            {"$limit": 10}
        ])

mongodb shell

db.o2o_geos.aggregate([
   {
     $geoNear: {near: { type: "Point", coordinates: [120.13606048541625171, 30.29447292933346958] },
        distanceField: "distance",
        maxDistance: 2000,
        query: {status: -1},
        spherical: true
     }
   }
])