我有一个问题计算两个geopoints之间的距离。
I have a problem calculating the distance between two geopoints.
在geopoints是:
The geopoints are:
position1 = mapView.getProjection().fromPixels(
(int) e.getX(),
(int) e.getY());
和另一个
double lat = 35.1064;
double lng = 22.556412;
GeoPoint position2 = new GeoPoint((int)(lat * 1E6), (int)(lng * 1E6));
然后,我创建了两个位置:
Then I create two locations:
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,我计算出的距离:
And then I calculate the distance:
float distance = loc.distanceTo(loc2);
和我围着它
Math.round(distance);
不过,我得到这样的结果:
But I get results like:
1.4331783E7
1.4331783E7
我是什么做错了吗?
尝试以下我的方法,
/**
*
* @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();
}