用c语言实现已知一个点的经纬度、方位角、距离,求另一点经纬度

您好！要实现已知一个点的经纬度、方位角和距离，求另一点的经纬度，可以使用以下代码实现：

#include <stdio.h>
#include <math.h>

#define PI 3.14159265358979323846
#define EARTH_RADIUS 6371.0

typedef struct {
    double latitude;
    double longitude;
} Point;

Point calculateNewPoint(Point startPoint, double bearing, double distance) {
    Point newPoint;
    double angularDistance = distance / EARTH_RADIUS;

    double startLatRad = startPoint.latitude * PI / 180.0;
    double startLonRad = startPoint.longitude * PI / 180.0;

    double sinStartLat = sin(startLatRad);
    double cosStartLat = cos(startLatRad);
    double sinAngularDistance = sin(angularDistance);
    double cosAngularDistance = cos(angularDistance);

    double endLatRad = asin(sinStartLat * cosAngularDistance +
                            cosStartLat * sinAngularDistance * cos(bearing));
    double endLonRad = startLonRad + atan2(sin(bearing) * sinAngularDistance * cosStartLat,
                                           cosAngularDistance - sinStartLat * sin(endLatRad));

    newPoint.latitude = endLatRad * 180.0 / PI;
    newPoint.longitude = endLonRad * 180.0 / PI;

    return newPoint;
}

int main() {
    Point startPoint;
    startPoint.latitude = 40.712776;
    startPoint.longitude = -74.005974;

    double bearing = 45.0;
    double distance = 100.0;

    Point newPoint = calculateNewPoint(startPoint, bearing, distance);

    printf("New Point Latitude: %lf\n", newPoint.latitude);
    printf("New Point Longitude: %lf\n", newPoint.longitude);

    return 0;
}

在上述代码中，我们使用了 Haversine 公式来计算两个经纬度之间的距离。`calculateNewPoint` 函数接受一个起始点 `startPoint`、方位角 `bearing` 和距离 `distance` 作为输入，并返回一个新的点 `newPoint` 的经纬度。

您可以根据需要修改 `startPoint`、`bearing` 和 `distance` 的值，并在程序运行后得到新点的经纬度。请注意，经纬度以度为单位表示。