[英]Distance between geopoints
我在計算兩個地理點之間的距離時遇到問題。
地理位置是:
position1 = mapView.getProjection().fromPixels(
(int) e.getX(),
(int) e.getY());
而另一個
double lat = 35.1064;
double lng = 22.556412;
GeoPoint position2 = new GeoPoint((int)(lat * 1E6), (int)(lng * 1E6));
然后我創建了兩個位置:
Location loc = new Location("");
loc.setLatitude(position1.getLatitudeE6());
loc.setLongitude(position1.getLongitudeE6());
Location loc2 = new Location("");
loc.setLatitude(position2.getLatitudeE6());
loc.setLongitude(position2.getLongitudeE6());
然后我計算距離:
float distance = loc.distanceTo(loc2);
我圍繞它:
Math.round(distance);
但我得到的結果如下:
1.4331783E7
我究竟做錯了什么?
嘗試按照我的方法,
/**
*
* @param lat1 Latitude of the First Location
* @param lng1 Logitude of the First Location
* @param lat2 Latitude of the Second Location
* @param lng2 Longitude of the Second Location
* @return distance between two lat-lon in float format
*/
public static float distFrom (float lat1, float lng1, float lat2, float lng2 )
{
double earthRadius = 3958.75;
double dLat = Math.toRadians(lat2-lat1);
double dLng = Math.toRadians(lng2-lng1);
double a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) *
Math.sin(dLng/2) * Math.sin(dLng/2);
double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
double dist = earthRadius * c;
int meterConversion = 1609;
return new Float(dist * meterConversion).floatValue();
}
您的緯度和經度錯誤,請更換以下行
Location loc = new Location("");
loc.setLatitude(position1.getLatitudeE6());
loc.setLongitude(position1.getLongitudeE6());
Location loc2 = new Location("");
loc.setLatitude(position2.getLatitudeE6());
loc.setLongitude(position2.getLongitudeE6());
同
Location loc = new Location("");
loc.setLatitude(position1.getLatitudeE6()/1E6);
loc.setLongitude(position1.getLongitudeE6()/1E6);
Location loc2 = new Location("");
loc.setLatitude(position2.getLatitudeE6()/1E6);
loc.setLongitude(position2.getLongitudeE6()/1E6);
然后一次,你會得到正確的答案。
您將GeoPoint值設置為Location對象而不是double值嘗試設置為Latitude和Longitude的double值
Location loc = new Location("");
loc.setLatitude(35.1064);
loc.setLongitude(22.556412);
Location loc2 = new Location("");
loc2.setLatitude(22.556412);
loc2.setLongitude(35.1064);
現在得到的位置
float distance = loc.distanceTo(loc2);
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