经度/纬度转换为1英里是什么？ [英] What is the conversion of latitude/longitude to a 1 mile

问题描述

我正在使用Google地图，我需要能够在邮政编码中心周围5英里的范围内进行搜索，所以我认为最简单的方法是找出纬度/经度转换为英里。

解决方案

以下是使用 Google的几何图书馆。

请记住添加几何库。它与Google地图库不同。

$ b

 < script type =text / javascript 
 src =http://maps.googleapis.com/maps/api/js?libraries=geometry&sensor=false> 
< / script> 
  

示例用法：

  //距离函数默认为km。 
 //使用里程作为第三参数添加地球半径（以英里为单位）。 
 //地球半径以英里为单位== 3956.6 
 var distance = 
 google.maps.geometry.spherical.computeDistanceBetween（
 / * from LatLng * /，
 / *到LatLng * /，
 / *地球半径* / 
）; 
 
 if（distance <= 5）{//小于或等于五英里
 var marker = new google.maps.Marker（{
 map：map，
 position：// LatLng 
}）; 
} 
  

我有一个例子小提琴。

I'm working with Google Maps and I need to be able to search in a 5 mile radius around a zip code center so I figured the easiest way to do that would be to figure out the conversion of latitude/longitude to miles.

解决方案

Here is the basic idea using Google's Geometry library.

Remember to add the geometry library. It is separate than the Google maps library.

<script type="text/javascript" 
  src="http://maps.googleapis.com/maps/api/js?libraries=geometry&sensor=false">
</script>

example usage:

    //the distance function defaults to km.  
    //to use miles add the radius of the earth in miles as the 3rd param.
    //earths radius in miles == 3956.6
    var distance = 
      google.maps.geometry.spherical.computeDistanceBetween(
            /* from LatLng */, 
            /* to LatLng */, 
            /* radius of the earth */
      );

    if (distance <= 5) { //less or equal to five miles
        var marker = new google.maps.Marker({
            map: map,
            position: //LatLng
        });              
    }

I have an example fiddle of this in action.

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