兩個位置之間的距離不對

我已經使用http://www.movable-type.co.uk/scripts/latlong.html上的算法找到兩點之間的距離。兩個位置之間的距離不對

我的兩點是

long1 = 51.507467; 
lat1 = -0.08776; 

long2 = 51.508736; 
lat2 = -0.08612;

根據Movable Type Script答案是0.1812公里

我的應用程序給出結果（d）作爲0.230公里

檢查haversine公式：http://www.movable-type.co.uk/scripts/latlong.html

double R = 6371; // earth’s radius (mean radius = 6,371km) 
    double dLat = Math.toRadians(lat2-lat1); 

    double dLon = Math.toRadians(long2-long1); 
    a = Math.sin(dLat/2) * Math.sin(dLat/2) + 
      Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) * 
      Math.sin(dLon/2) * Math.sin(dLon/2); 
    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
    double d = R * c;

來源

2010-07-15 Ally

爲什麼要重塑自己的距離計算器，有一個內置於Location類。

退房

distanceBetween(double startLatitude, double startLongitude, double endLatitude, double endLongitude, float[] results) 
Computes the approximate distance in meters between two locations, and optionally the initial and final bearings of the shortest path between them.

來源

2010-07-15 17:41:23 Pentium10

會試試:) – Ally 2010-07-15 18:41:04

它工作！謝謝 – Ally 2010-07-15 18:51:36

您的實施是正確的。給定這些經度和緯度的距離應該產生0.230 km的距離。但是，座標的正常輸入是（緯度，經度）。將它們放在後面（經度，緯度）會產生不正確的距離0.1812 km。

來源

2010-07-15 17:25:18

哦......有些尷尬。感謝您的幫助:) – Ally 2010-07-15 18:53:19

public double CalculationByDistance(GeoPoint StartP, GeoPoint EndP) { 
    double lat1 = StartP.getLatitudeE6()/1E6; 
    double lat2 = EndP.getLatitudeE6()/1E6; 
    double lon1 = StartP.getLongitudeE6()/1E6; 
    double lon2 = EndP.getLongitudeE6()/1E6; 
    double dLat = Math.toRadians(lat2-lat1); 
    double dLon = Math.toRadians(lon2-lon1); 
    double a = Math.sin(dLat/2) * Math.sin(dLat/2) + 
    Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) * 
    Math.sin(dLon/2) * Math.sin(dLon/2); 
    double c = 2 * Math.asin(Math.sqrt(a)); 
    return Radius * c; 
}

盟友你的概念是right.May一點點昌在這一行double c = 2 * Math.asin(Math.sqrt(a));

來源

2012-05-15 11:16:43

兩個位置之間的距離不對

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