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

问题描述

我正在使用 $geoWithin 作为圆圈，但我没有得到预期的结果.有两个集合，一个用于 users，第二个用于 items.我正在为项目设置半径和坐标.所以我必须在那个坐标和半径内找到一个用户.

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.

用户收藏

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

物品集合

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

根据物品坐标和用户坐标，两地之间的距离约为500公里.

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

查询

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

根据 $geoWithin，用户不应该显示，但它正在显示.如果我做错了什么，请帮助我.

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

谢谢

推荐答案

我认为你的问题是，你搜索的范围太广了.根据 MongoDB 文档，$ 的正确语法centerSphere 是:

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 ] } 
     }
} )

您现在正在搜索点周围 29153.88048637637 英里半径内的点，并且两个点都在您定义的中心周围的半径内.

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.

希望对你有帮助:)

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