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