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mongodb筛选具有经度，纬度和特定距离的文档

本文介绍了mongodb筛选具有经度，纬度和特定距离的文档的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我的架构设计:

var LocationSchema = new Schema({
  area: String,
  loc: [
    type: [Number],  // [<longitude>, <latitude>]
    index: '2d'      // create the geospatial index
    ]

});

module.exports = mongoose.model('Location', LocationSchema);

数据已像此mongodb一样存储

Data has stored like this mongodb

{
    "_id": {
        "$oid": "58c2796d734d1d46588666c6"
    },
    "area": "madiwla",
    "loc": [
        12.9226,
        77.6174
    ]
}
{
    "_id": {
        "$oid": "58c27989734d1d4658866705"
    },
    "area": "majestic",
    "loc": [
        12.9767,
        77.5713
    ]
}

{
    "_id": {
        "$oid": "58ca1e21734d1d2ca8566f3c"
    },
    "area": "shanthi nagar",
    "loc": [
        12.8486,
        77.6837
    ]
}

之后，我就完成了

db.locations.ensureIndex({loc:"2d"})

现在我想过滤2km或5m之内的数据我对此查询感到厌倦，但每次查询时间都返回所有文档

now i want to filter data within 2km or 5mi tired this query but every evry times query returns all the documents

我已经进行了1公里的最大距离查询

i have run 1km max distance query 

db.locations.find({ loc : { $near : [12.9592,77.6974] , $maxDistance : 100/111.12 } } )

我给了marathahalli纬度和经度

i given marathahalli latitude and longitude

marathahalli到madiwala的距离:-13.4公里

marathahalli to madiwala distance :- 13.4 km

马拉松哈里(Marathahalli)至雄伟的距离:-20.4公里

marathahalli to majestic distance :- 20.4 km

marathahalli到Shanthi nagar的距离:-23.4公里

marathahalli to shanthi nagar distance :- 23.4 km

但是为什么我的查询返回所有文档.我的代码中是否有任何错误，请帮帮我吗?

but why my query returns all the documnents .IS there any mistake in my code please help me out?

我也尝试过此操作，但出现错误

i tried this also but got error 

db.locations.find({ loc : {
  $near: {
     $geometry: {
          loc: [12.9592,77.6974]
     },
     $maxDistance:0,
     $minDistance:250
  }
} } )

Error: error: {
        "waitedMS" : NumberLong(0),
        "ok" : 0,
        "errmsg" : "invalid point in geo near query $geometry argument: { loc: [
 12.9592, 77.6974 ] }  Point must be an array or object",
        "code" : 2
}

我已经尝试过mongoshell，但是我什么都没得到

i have tried in mongoshell but i am not getting anything

db.locations.createIndex({loc:"2dsphere"})
{
        "createdCollectionAutomatically" : false,
        "numIndexesBefore" : 3,
        "numIndexesAfter" : 3,
        "note" : "all indexes already exist",
        "ok" : 1
}
rs-ds161028:PRIMARY> db.locations.aggregate([ {$geoNear: { near :{type
 "Point", coordinates:[77.6974,12.9591]}, distanceField: "distance", spherical:
true } } ])

{ "_id" : ObjectId("58c27989734d1d4658866705"), "area" : "majestic", "loc" : [
2.9767, 77.5713 ], "distance" : 8017976.609884486 }
{ "_id" : ObjectId("58c2796d734d1d46588666c6"), "area" : "madiwla", "loc" : [ 1
.9226, 77.6174 ], "distance" : 8021105.860532911 }
{ "_id" : ObjectId("58ca1e21734d1d2ca8566f3c"), "area" : "shanthi nagar", "loc"
: [ 12.8486, 77.6837 ], "distance" : 8025509.538529409 }

rs-ds161028:PRIMARY>  db.locations.find({ loc:{ $near:{ $geometry: {ty
e: "Point" , coordinates:[77.6974,12.9591] }, $maxDistance:10000 }}})
rs-ds161028:PRIMARY>

推荐答案

在开始之前，我将添加两点-

Before starting i would add two points-

  1. 使用mongo时，请始终以[long.，lat.]方式插入位置
  2. 请指定要插入的几何类型.有关类型的更多信息，请参考mongoDB 文档.

关于您的查询，我添加了三点作为您的问题，我的数据如下所示-

Coming to your query, I added three points as your question and my data looks like below-

> db.test.find()
{ "_id" : "madiwala", "type" : "Point", "loc" : [ 77.6174, 12.9226 ] }
{ "_id" : "Majestic", "type" : "Point", "loc" : [ 77.5712, 12.9766 ] }
{ "_id" : "ShanthiNgr", "type" : "Point", "loc" : [ 77.6836, 12.8486 ] }

我给定类型:"Point"，因为这是在mongo中使用球形类型位置的保留键.此外，我还添加了[long，lat]作为位置.后来我在loc字段上添加了2dSphere索引.

I have given type: "Point" because this is a reserved key for using spherical type locations in mongo. Moreover I have added [long, lat] for location.Later I added a 2dSphere index on loc field.

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

然后我在下面的查询中执行以了解距Marathahalli [77.6974,12.9591]-

Then I executed below query to know the distance from Marathahalli [77.6974,12.9591]-

> db.test.aggregate([ {$geoNear: { near :{type: "Point", coordinates:[77.6974,12
.9591]}, distanceField: "distance", spherical: true } } ])
{ "_id" : "madiwala", "type" : "Point", "loc" : [ 77.6174, 12.9226 ], "distance": 9583.305405402776 }
{ "_id" : "ShanthiNgr", "type" : "Point", "loc" : [ 77.6836, 12.8486 ], "distance" : 12391.53898270671 }
{ "_id" : "Majestic", "type" : "Point", "loc" : [ 77.5712, 12.9766 ], "distance": 13828.057829128267 }

以上查询仅用于测试目的，目的是了解距离.它以米为单位显示距离，因此我可以轻松地将其转换为公里.

Above query is just for testing purpose to know the distance. It tells distance in meters so i can easily convert it into kms.

现在，我确实在查询下面运行，以查找距马拉松哈里(Marathahalli)10公里以内的位置.距离，我得到了我想要的结果-

Now I did run below query to find locations from Marathahalli within 10 kms. distance and i got my desired result-

> db.test.find({ loc:{ $near:{ $geometry: {type: "Point" , coordinates:[77.6974,12.9591] }, $maxDistance:10000 }}})
{ "_id" : "madiwala", "type" : "Point", "loc" : [ 77.6174, 12.9226 ] }

我发现您尝试的方法几乎没有问题-

I found few issues with approach you were trying-

希望它可以帮助您...祝您有美好的一天...:)

Hope it helps you...have a good day...:)

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09-14 23:24
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