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package dk.daoas.adressevedligehold.afstandandenrute; |
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import dk.daoas.adressevedligehold.beans.Address; |
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public class GeoPointHelper { |
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// Latitude (horizonal), longitude(vertical) so |
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// 1 degree latitude is ~ 111320 meters, since the distance between the |
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// horizonal lines is always the same |
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// 1 degree longitude is ~111320 meters at equator but gets shorter as we |
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// get closer to the poles. |
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// so 1 degree longitude is 64.5 km at denmarks southern point |
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// (gedser=54.55,11.95) |
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// and is 59.4km at northern point (skagen = 57.75,10.65) |
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public static double kmToLatitude(double km) { |
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return km / 111.320; |
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} |
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public static double kmToLongitude(double km) {// denne er kun ca |
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return km / 62.0; |
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} |
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
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/* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */ |
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/* :: This function converts decimal degrees to radians : */ |
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/* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */ |
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private static double deg2rad(double deg) { |
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return (deg * Math.PI / 180.0); |
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} |
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/* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */ |
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/* :: This function converts radians to decimal degrees : */ |
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/* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */ |
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private static double rad2deg(double rad) { |
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return (rad * 180 / Math.PI); |
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} |
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// http://www.geodatasource.com/developers/java |
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private static double distanceHaversine(double lat1, double lon1, |
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double lat2, double lon2) { |
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double theta = lon1 - lon2; |
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double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) |
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+ Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) |
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* Math.cos(deg2rad(theta)); |
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dist = Math.acos(dist); |
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dist = rad2deg(dist); |
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dist = dist * 60 * 1.1515; |
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// indtil nu er dist i miles - så vi omregner lige til km |
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dist = dist * 1.609344; |
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return (dist); |
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} |
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public static double beregnAfstand(Address p1, Address p2) { |
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if (p1.latitude == p2.latitude && p1.longitude == p2.longitude) { |
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return 0.00; //Haversine går i baglås hvis p1 og p2 er samme position |
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} |
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return distanceHaversine(p1.latitude, p1.longitude, p2.latitude, p2.longitude); |
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} |
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} |