Geospector GPS-Forum (vormals kowoma GPS-Forum)

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Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2));

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d = sqrt((X2 - X1)^2 + (Y2 - Y1)^2) 

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public static double distance(final double[] p1, final double[] p2) {
		/* longitude point 1 */
		double lon1 = CalculateDistance.toRad(p1[0]);
		/* latitude point 1 */
		double lat1 = CalculateDistance.toRad(p1[1]);
		/* longitude point 2 */
		double lon2 = CalculateDistance.toRad(p2[0]);
		/* latitude point 2 */
		double lat2 = CalculateDistance.toRad(p2[1]);
		
		double c =  Math.acos((Math.sin(lat1) * Math.sin(lat2)) + (Math.cos(lat1) * Math.cos(lat2)
						   * Math.cos((lon2) - (lon1))));
		return CalculateDistance.EARTH_RADIUS * c;
	}
	
	/**
	 * use haversine formula to calculate distance (in km) between two points specified by 
	 * latitude/longitude (in numeric degrees)
	 * @param p1 point with lat/long in numeric values
	 * @param p2 geometry point with lat/long in numeric values (e.g. lat = 47.325265; lon = 9.62748)
	 * @return distance in km
	 */
	public static double distanceHaversine(final double[] p1, final double[] p2) {
		/* longitude point 1 */
		double lon1 = p1[0];
		/* latitude point 1 */
		double lat1 = p1[1];
		/* longitude point 2 */
		double lon2 = p2[0];
		/* latitude point 2 */
		double lat2 = p2[1];
		/* delta latitude */
		double dLat = CalculateDistance.toRad((lat2 - lat1));
		/* delta longitude */
		double dLon = CalculateDistance.toRad(lon2 - lon1);
		
		double a = Math.sin(dLat / 2) * Math.sin(dLat / 2)
			+ Math.cos(CalculateDistance.toRad(lat1)) * Math.cos(CalculateDistance.toRad(lat2))
			* Math.sin(dLon / 2) * Math.sin(dLon / 2); 
		double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
		
		return CalculateDistance.EARTH_RADIUS * c;
	}

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Math.acos((Math.sin(lat1) * Math.sin(lat2)) + (Math.cos(lat1) * Math.cos(lat2)
						   * Math.cos((lon2) - (lon1)))) * 6378.388;

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13.653229423705211 km/h

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15.6 km/h