英文:
How can I find nearby place with latitude and longitude in mongodb?
问题
我对MongoDB和Golang非常陌生。我有一个名为"myplace"的集合,它有以下字段:place_name、city、latitude、longitude。我的问题是,用户在某个地方并搜索附近的地点。我如何查询MongoDB以找到附近的位置?还有在Golang中如何实现。
我的文档结构如下:
{
"_id" : ObjectId("544a2147785b707b340ed6c7"),
"latitude" : 12.36547,
"longitude" : 1.235689,
"place_name" : "some_place",
"city" : "Some city"
}
提前感谢。
英文:
Am very new to mongodb and golang. I have a collection named "myplace" It has the following fileds place_name, city, latitude, longitude. My question is user in some place and searching the nearby places. How can I query to mongodb to find near by locations. Also in golang.
My doc structure
{
"_id" : ObjectId("544a2147785b707b340ed6c7"),
"latitude" : 12.36547,
"longitude" : 1.235689,
"place_name" : "some_place",
"city" : "Some city"
}
Thanks in advance
答案1
得分: 8
你好,根据你的情况,我认为你应该将上面的文档更改如下:
{
"_id" : ObjectId("545749dba2b0b4cf603a7546"),
"city" : "B",
"placeName" : "A",
"loc" : {
"lon" : 51.10682735591432,
"lat" : -114.11773681640625
}
}
{
"_id" : ObjectId("545749f3a2b0b4cf603a7547"),
"city" : "B1",
"placeName" : "A1",
"loc" : {
"lon" : 51.09144802136697,
"lat" : -114.11773681640625
}
}
然后按照以下方式对上述文档进行索引:
db.collectionName.ensureIndex({loc:"2d"})
如果索引执行成功,可以使用以下查询语句查找附近的文档:
db.location.find({loc: {$near:[51,-114]}})
如果需要更多帮助,可以参考MongoDB的$near
和$geoNear
操作符点击这里。
对于Golang,我不太了解,但你可以参考以下代码:
var places []Place
lat := 51.515614
long := -0.268998
err = coll.Find(bson.M{"loc": bson.M{"$near": []float64{long, lat}, "$maxDistance": 0.056}}).All(&places)
英文:
Hi For your case I think you should changed above doc as below
{
"_id" : ObjectId("545749dba2b0b4cf603a7546"),
"city" : "B",
"placeName" : "A",
"loc" : {
"lon" : 51.10682735591432,
"lat" : -114.11773681640625
}
}
{
"_id" : ObjectId("545749f3a2b0b4cf603a7547"),
"city" : "B1",
"placeName" : "A1",
"loc" : {
"lon" : 51.09144802136697,
"lat" : -114.11773681640625
}
}
After that indexing the above documents as below
db.collectionName.ensureIndex({loc:"2d"})
If indexing executing properly then write following query to find out near by documents
db.location.find({loc: {$near:[51,-114]}})
for more help you should refer this mongo $near and $geoNear click here
and sorry for golang because I don't know more about golang
for golang
var places []Place
lat := 51.515614
long := -0.268998
err = coll.Find(bson.M{"loc": bson.M{"$near": []float64{long, lat}, "$maxDistance" : 0.056}}).All(&places)
答案2
得分: 2
这个链接可能对你有帮助 https://github.com/mendrugory/Airports
MongoDB查询(使用Python)
def get_closest_airports(lonlat, limit=10):
"""
使用原始查询返回“limit”个最近的机场。
:param latlon list:
:return list of airports:
"""
return Airport.objects(
__raw__={"loc": {"$near": {"$geometry": {"type": "Point", "coordinates": lonlat}}}}).limit(limit)
JSON结构如下
{
"city": "Goroka",
"tz": "Pacific/Port_Moresby",
"name": "Goroka",
"dst": "U",
"loc": {
"type": "Point",
"coordinates": [145.391881, -6.081689]
},
"country": "Papua New Guinea",
"iata/faa": "GKA",
"altitude": 5282.0,
"icao": "AYGA",
"timezone": 10.0,
"id": 1
}
英文:
This link might help you https://github.com/mendrugory/Airports
MongoDB query (python)
def get_closest_airports(lonlat, limit=10):
"""
Using a raw query it returns the "limit" closest airports.
:param latlon list:
:return list of airports:
"""
return Airport.objects(
__raw__={"loc": {"$near": {"$geometry": {"type": "Point", "coordinates": lonlat}}}}).limit(limit)
json structure is as following
{"city": "Goroka", "tz": "Pacific/Port_Moresby", "name": "Goroka", "dst": "U", "loc": {"type": "Point", "coordinates": [145.391881, -6.081689]}, "country": "Papua New Guinea", "iata/faa": "GKA", "altitude": 5282.0, "icao": "AYGA", "timezone": 10.0, "id": 1}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库,让每个人都能够通过互相帮助和分享经验来进步。
评论