标签:blog http io ar os sp java on div
初始化集合(经度在前,纬度在后)
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mongos> db.checkins.insert({ "_id" : "101" , "loc" : [ 116.3447 , 39.9789 ]}) mongos> db.checkins.insert({ "_id" : "102" , "loc" : [ 116.3447 , 39.8789 ]}) mongos> db.checkins.insert({ "_id" : "103" , "loc" : [ 116.3447 , 39.5789 ]}) |
create geospatial index
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mongos> db.checkins.ensureIndex({loc: "2d" }) |
查找44km以内的人
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mongos> db.checkins.find({loc:{$near:[ 116.344722 , 39.9789 ],$maxDistance: 44 / 111.12 }}) |
注意距离要除以111.2(1度=111.2km)
关于mongodb geospatial index 详见stackoverflow
标签:blog http io ar os sp java on div
原文地址:http://www.cnblogs.com/steven9801/p/4115119.html