数码电子产品网站建设策划书,网站开发绑定qq,佛山建网站,蓝牙app开发软件我们在实际开发中会获取对应的经纬度#xff0c;可以使用ES大数据搜索引擎进行计算对应区域的数据#xff0c;那我们在如何根据两个经纬度获取对应的球面距离#xff0c;就是在地球上从一个地点到另一个地点的直线距离
工具类如下:
public class GeoUtils {// 地球半径可以使用ES大数据搜索引擎进行计算对应区域的数据那我们在如何根据两个经纬度获取对应的球面距离就是在地球上从一个地点到另一个地点的直线距离
工具类如下:
public class GeoUtils {// 地球半径单位米private static final double EARTH_RADIUS 6371000.0;/*** 使用Haversine公式计算两点之间的球面距离** param lat1 latitude 纬度* param lon1 longitude 经度* param lat2 纬度* param lon2 经度* return 球面距离*/public static double haversineDistance(double lat1, double lon1, double lat2, double lon2) {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.atan2(Math.sqrt(a), Math.sqrt(1 - a));return EARTH_RADIUS * c;}/*** 使用Vincenty公式计算两点之间的球面距离** param lat1 latitude 纬度* param lon1 longitude 经度* param lat2 纬度* param lon2 经度* return 球面距离*/public static double vincentyDistance(double lat1, double lon1, double lat2, double lon2) {double a EARTH_RADIUS;double f 1.0 / 298.257223563; // WGS-84 ellipsoid parametersdouble b a * (1.0 - f);double lat1Rad Math.toRadians(lat1);double lon1Rad Math.toRadians(lon1);double lat2Rad Math.toRadians(lat2);double lon2Rad Math.toRadians(lon2);double L lon2Rad - lon1Rad;double U1 Math.atan((1.0 - f) * Math.tan(lat1Rad));double U2 Math.atan((1.0 - f) * Math.tan(lat2Rad));double sinU1 Math.sin(U1);double cosU1 Math.cos(U1);double sinU2 Math.sin(U2);double cosU2 Math.cos(U2);double lambda L;double lambdaP;int iterLimit 100;double cosSigma, sinSigma, sigma, sinAlpha, cosSqAlpha, cos2SigmaM;do {double sinLambda Math.sin(lambda);double cosLambda Math.cos(lambda);sinSigma Math.sqrt((cosU2 * sinLambda) * (cosU2 * sinLambda) (cosU1 * sinU2 - sinU1 * cosU2 * cosLambda) *(cosU1 * sinU2 - sinU1 * cosU2 * cosLambda));if (sinSigma 0) {return 0.0;}cosSigma sinU1 * sinU2 cosU1 * cosU2 * cosLambda;sigma Math.atan2(sinSigma, cosSigma);sinAlpha cosU1 * cosU2 * sinLambda / sinSigma;cosSqAlpha 1.0 - sinAlpha * sinAlpha;cos2SigmaM cosSigma - 2.0 * sinU1 * sinU2 / cosSqAlpha;if (Double.isNaN(cos2SigmaM)) {cos2SigmaM 0.0;}double C f / 16.0 * cosSqAlpha * (4.0 f * (4.0 - 3.0 * cosSqAlpha));lambdaP lambda;lambda L (1.0 - C) * f * sinAlpha *(sigma C * sinSigma * (cos2SigmaM C * cosSigma * (-1.0 2.0 * cos2SigmaM * cos2SigmaM)));} while (Math.abs(lambda - lambdaP) 1e-12 --iterLimit 0);if (iterLimit 0) {return Double.NaN; // Formula failed to converge}double uSq cosSqAlpha * (a * a - b * b) / (b * b);double A 1 uSq / 16384.0 * (4096.0 uSq * (-768 uSq * (320 - 175 * uSq)));double B uSq / 1024.0 * (256.0 uSq * (-128.0 uSq * (74.0 - 47 * uSq)));double deltaSigma B * sinSigma * (cos2SigmaM B / 4.0 * (cosSigma * (-1.0 2.0 * cos2SigmaM * cos2SigmaM) -B / 6.0 * cos2SigmaM * (-3.0 4.0 * sinSigma * sinSigma) *(-3.0 4.0 * cos2SigmaM * cos2SigmaM)));return b * A * (sigma - deltaSigma);}/*** 使用球面三角法计算两点之间的球面距离** param lat1 latitude 纬度* param lon1 longitude 经度* param lat2 纬度* param lon2 经度* return 球面距离*/public static double sphericalLawOfCosinesDistance(double lat1, double lon1, double lat2, double lon2) {double dLon Math.toRadians(lon2 - lon1);lat1 Math.toRadians(lat1);lat2 Math.toRadians(lat2);return Math.acos(Math.sin(lat1) * Math.sin(lat2) Math.cos(lat1) * Math.cos(lat2) * Math.cos(dLon)) * EARTH_RADIUS;}/*** 将米转换成公里** param meters* return*/public static double metersToKilometers(double meters) {return meters / 1000.0;}}测试从纽约到伦敦的距离 public static void main(String[] args) {double newYorkLat 40.7128; // 纽约的纬度double newYorkLon -74.0060; // 纽约的经度double londonLat 51.5074; // 伦敦的纬度double londonLon -0.1278; // 伦敦的经度double distance1 GeoUtils.haversineDistance(newYorkLat, newYorkLon, londonLat, londonLon);System.out.println(从纽约到伦敦的球面距离 distance1 米 , metersToKilometers(distance1) 公里);double distance2 GeoUtils.vincentyDistance(newYorkLat, newYorkLon, londonLat, londonLon);System.out.println(从纽约到伦敦的球面距离 distance2 米 , metersToKilometers(distance2) 公里);double distance3 GeoUtils.sphericalLawOfCosinesDistance(newYorkLat, newYorkLon, londonLat, londonLon);System.out.println(从纽约到伦敦的球面距离 distance3 米 , metersToKilometers(distance3) 公里);}
这样子就可以求出地球上两点之间的距离了
