Mongodb：检查点是否在存储的多边形内 [英] Mongodb : Check if a point is inside a stored polygon

问题描述

我将一些代表国家边界的多边形与国家名称一起存储在数据库中。
现在我想要做的是检查一个点是在哪个国家。
例如，如果我给我自己的地理定位，我想得到我所在的国家。

有没有办法用mongodb做到这一点？也许与geoWithin？

谢谢

解决方案

位置数据如下：

  {loc：
 {coordinates：[
 [ 
 [1.0,1.0]，
 [1.0,10.0]，
 [10.0,10.0]，
 [10.0,1.0]，
 [1.0,1.0] 
 
 
type：Polygon
} 
} 
  

然后发送 $ geoIntersects 查询

  db.polygons.find（{loc：{$ geoIntersects：{$ geometry：{type：Point，coordinates：[x，y]}}}} 
  

I'm new to the mongodb geolocation features.

I stored some polygons that represent the country borders in a database along with the country name. Now what i would like to do is checking which country a point is in. For example if i give my own geolocation i would like to get the country where i am.

Is there a way to do it with mongodb? Maybe with geoWithin?

Thank you

解决方案

You must store your location data like this schema:

{"loc":
     {"coordinates":[
       [
         [1.0,1.0],
         [1.0,10.0],
         [10.0,10.0],
         [10.0,1.0],
         [1.0,1.0]
       ]
      ],
     "type":"Polygon"
   }
}

and then send $geoIntersects queries

db.polygons.find({"loc":{"$geoIntersects":{"$geometry":{"type":"Point", "coordinates":[x, y]}}}}

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