MongoDB 空间定位（点） 与 距离检索

转自： http://blog.csdn.net/flamingsky007/article/details/39208837

基于 MongoDB 2.6

GeoJSON 格式

{ "type": "Point", "coordinates": [lon(经度),lat(纬度)]}

测试数据

db.point.test.insert({"address" : "南京 禄口国际机场","loc" : { "type": "Point", "coordinates": [118.783799,31.979234]}})
db.point.test.insert({"address" : "南京 浦口公园","loc" : { "type": "Point", "coordinates": [118.639523,32.070078]}})
db.point.test.insert({"address" : "南京 火车站","loc" : { "type": "Point", "coordinates": [118.803032,32.09248]}})
db.point.test.insert({"address" : "南京 新街口","loc" : { "type": "Point", "coordinates": [118.790611,32.047616]}})
db.point.test.insert({"address" : "南京 张府园","loc" : { "type": "Point", "coordinates": [118.790427,32.03722]}})
db.point.test.insert({"address" : "南京 三山街","loc" : { "type": "Point", "coordinates": [118.788135,32.029064]}})
db.point.test.insert({"address" : "南京 中华门","loc" : { "type": "Point", "coordinates": [118.781161,32.013023]}})
db.point.test.insert({"address" : "南京 安德门","loc" : { "type": "Point", "coordinates": [118.768964,31.99646]}})

一定要加索引

db.point.test.ensureIndex( { loc : "2dsphere" } )

检索规定半径以内数据（单位为米）

    {loc:{$near: {$geometry: {type: "Point" ,coordinates: [118.783799,31.979234]},$maxDistance: 5000}}} //5000米以内数据