public static final double DEGREES_TO_RADIANS = Math.PI / 180.0; public static final double RADIANS_TO_DEGREES = 180.0 / Math.PI; //地球半径 public static final double EARTH_MEAN_RADIUS_KM = 6371.009; //地球直径 private static final double EARTH_MEAN_DIAMETER = EARTH_MEAN_RADIUS_KM * 2; /*** * 距离半径计算方式 * @param latCenterRad 中心点经纬度 * @param lonCenterRad * @param latVals 目标经纬度 * @param lonVals * @return 两坐标的距离 单位千米 */ public static double doubleVal(double latCenterRad, double lonCenterRad, double latVals, double lonVals) { //计算经纬度 double latRad = latVals * DEGREES_TO_RADIANS; double lonRad = lonVals * DEGREES_TO_RADIANS; //计算经纬度的差 double diffX = latCenterRad * DEGREES_TO_RADIANS - latRad; double diffY = lonCenterRad * DEGREES_TO_RADIANS - lonRad; //计算正弦和余弦 double hsinX = Math.sin(diffX * 0.5); double hsinY = Math.sin(diffY * 0.5); double latCenterRad_cos = Math.cos(latCenterRad * DEGREES_TO_RADIANS); double h = hsinX * hsinX + (latCenterRad_cos * Math.cos(latRad) * hsinY * hsinY); return (EARTH_MEAN_DIAMETER * Math.atan2(Math.sqrt(h), Math.sqrt(1 - h))); }