MongoDB:使用$ geoWithin操作符没有得到正确的结果 [英] MongoDB: Not getting correct result using $geoWithin operator

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问题描述

我正在为使用 $ geoWithin ,并且我没有得到预期的结果。有两个集合,一个用于用户,另一个用于项目。我正在设置项目的半径和坐标。所以我必须在该坐标和半径内找到用户。



用户集合

  {
_id:NumberLong(25287),
_class:com.samepinch.domain.user.User,
name:XYZ,
location:[
74.866247,
31.63336
]
}

项目集合

  {
_id:NumberLong(46603),
itemName:Chandigarh,
categoryName:TRAVELING,
location:{
_id:null,
longitude: 77.15319738236303,
latitude:28.434568229025803,
radius:29153.88048637637
}
}

根据物品坐标和用户坐标,两个地点之间的距离大约为500公里。

查询

  db.users.find({location:{$ geoWithin:{$ center:[[77.15319738236303,28.43456822902580 3],29153.88048637637 / 3963.2]}}}).count()

根据$ geoWithin,不应该显示,但它显示。如果我做错了什么,请帮助我。

谢谢 解决方案

我认为你的问题在于,你在半径太大的范围内搜索。
根据 MongoDB文档,正确的语法 $ centerSphere 是:

  db。< name> .find( {
loc:{$ geoWithin:
{
$ centerSphere:[[< longitude>,< latitude>],
< MILES> /3963.2]中的半径}}

})

您现在正在29153.88048637637英里半径内搜索点围绕你的观点,并且这两个点都在你定义的中心附近的半径内。



我希望这可以帮助你:)

I am using $geoWithin for circle, and i am not getting expected result. There are two collections,one for users and second for items. I am setting radius and coordinates for item. so i have to find a users within that coordinates and radius.

User collection

{
    "_id" : NumberLong(25287),
    "_class" : "com.samepinch.domain.user.User",
    "name":"XYZ",
    "location" : [
        74.866247,
        31.63336
    ]
}

Item collection

{
    "_id" : NumberLong(46603),
    "itemName" : "Chandigarh",
    "categoryName" : "TRAVELLING",
    "location" : {
        "_id" : null,
        "longitude" : 77.15319738236303,
        "latitude" : 28.434568229025803,
        "radius" : 29153.88048637637
    }
}

as according to item coordinates and user coordinates,there is approx 500 km distance between two places.

Query

db.users.find({ location: { $geoWithin: { $center: [ [77.15319738236303,28.434568229025803], 29153.88048637637/3963.2] } } } ).count()

According to $geoWithin,user should not show,but it is showing. If i am doing something wrong,please help me.

Thanks

解决方案

I think your problem is, you are searching in a far too wide radius. According to the MongoDB documentation, the correct syntax of $centerSphere is:

db.<name>.find( {
    loc: { $geoWithin: 
     { 
        $centerSphere: [ [ <longitude>, <latitude> ],
        <radius in MILES>/3963.2 ] } 
     }
} )

You are now searching points in a 29153.88048637637 mile radius around your point, and both points are in that radius around the center you defined.

I hope this helps you :)

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