两个位置之间的距离不对？答案

【问题标题】：distance between two locations is not right?两个位置之间的距离不对？
【发布时间】：2014-07-12 15:03:22
【问题描述】：

我使用这个获得了两个位置：

LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

然后我计算它们之间的距离，但距离不正确

public static float calculateDistance(double e, double f, double g, double h)
{
    float dLat = (float) Math.toRadians(g - e);
    float dLon = (float) Math.toRadians(h - f);
    float a =
            (float) (Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(Math.toRadians(e))
                    * Math.cos(Math.toRadians(g)) * Math.sin(dLon / 2) * Math.sin(dLon / 2));
    float c = (float) (2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)));
    float d = 6371 * c;
    return d;
}

(32.2163799,35.0420986) (31.9210915,35.2037014)

结果 36.193707 公里但实际远不止这些，大约 85 公里

【问题讨论】：

你怎么知道diszance不是真的？你从哪里得到的 85 公里？您是否通过允许计算距离的网页检查了距离？

标签： android location distance

【解决方案1】：

使用静态方法distanceBetween() 获取以米为单位的距离

float[] results = new float[3];
Location.distanceBetween(startLatitude, startLongitude, endLatitude, endLongitude, results);
float distanceInMeters = results[0]

请注意，结果数组将与两点之间的距离相关的几个值打包在一起：

  - results[0] -  distance in meters
  - results[1] -  initial bearing angle of the shortest path between them
  - results[2] -  final bearing angle of the shortest path between them

【讨论】：

【解决方案2】：

您可以为此使用标准功能：

Location location1 = new Location("<provider name");
location1.setLatitude(lat1);
location1.setLongitude(lng1);

Location location2 = new Location("<provider name");
location2.setLatitude(lat2);
location2.setLongitude(lng2);

float distance = location1.distanceTo(location2);

或函数之间的距离： http://developer.android.com/reference/android/location/Location.html#distanceBetween%28double,%20double,%20double,%20double,%20float[]%29

【讨论】：