C++实现经纬度坐标转utm坐标，详细代码是什么

以下是 C 语言实现经纬度坐标转 UTM 坐标的示例代码：

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

#define PI 3.14159265358979323846
#define a 6378137.
#define b 6356752.314245
#define f (a - b) / a
#define e sqrt(2 * f - f * f)

double rad(double d) {
    return d * PI / 180.;
}

void LLtoUTM(double lat, double lon, int *zone, double *x, double *y) {
    double lon, x, y, N, T, C, A, M;
    int zoneNumber;

    zoneNumber = (int) ((lon + 180.) / 6.) + 1;

    if (lat >= 56. && lat < 64. && lon >= 3. && lon < 12.) {
        zoneNumber = 32;
    }

    if (lat >= 72. && lat < 84.) {
        if (lon >= . && lon < 9.) {
            zoneNumber = 31;
        } else if (lon >= 9. && lon < 21.) {
            zoneNumber = 33;
        } else if (lon >= 21. && lon < 33.) {
            zoneNumber = 35;
        } else if (lon >= 33. && lon < 42.) {
            zoneNumber = 37;
        }
    }

    lon = zoneNumber * 6 - 183;

    x = 500000.;
    y = (lat < .) ? 10000000. : .;

    N = a / sqrt(1 - e * e * sin(rad(lat)) * sin(rad(lat)));
    T = tan(rad(lat)) * tan(rad(lat));
    C = e * e * cos(rad(lat)) * cos(rad(lat)) / (1 - e * e);
    A = cos(rad(lat)) * (rad(lon) - rad(lon));
    M = a * ((1 - e * e / 4 - 3 * e * e * e * e / 64 - 5 * e * e * e * e * e * e / 256) * rad(lat)
            - (3 * e * e / 8 + 3 * e * e * e * e / 32 + 45 * e * e * e * e * e * e / 1024) * sin(2 * rad(lat))
            + (15 * e * e * e * e / 256 + 45 * e * e * e * e * e * e / 1024) * sin(4 * rad(lat))
            - (35 * e * e * e * e * e * e / 3072) * sin(6 * rad(lat)));

    *x = x + N * (A + (1 - T + C) * A * A * A / 6
            + (5 - 18 * T + T * T + 72 * C - 58 * e * e) * A * A * A * A * A / 120);
    *y = y + M + N * tan(rad(lat)) * (A * A / 2 + (5 - T + 9 * C + 4 * C * C) * A * A * A * A / 24
            + (61 - 58 * T + T * T + 600 * C - 330 * e * e) * A * A * A * A * A * A / 720);
    *zone = zoneNumber;
}

int main() {
    double lat = 39.9087;
    double lon = 116.3975;
    int zone;
    double x, y;

    LLtoUTM(lat, lon, &zone, &x, &y);

    printf("经度: %f\n", lon);
    printf("纬度: %f\n", lat);
    printf("UTM 坐标: %d %f %f\n", zone, x, y);

    return ;
}

该代码实现了经纬度坐标转 UTM 坐标的功能，其中包括了一些常量和函数，如 `PI`、`a`、`b`、`f`、`e` 和 `rad`。`LLtoUTM` 函数接受经纬度坐标和指向 UTM 坐标的指针，计算出 UTM 坐标和所在的 UTM 带号。在 `main` 函数中，我们将北京市的经纬度坐标传递给 `LLtoUTM` 函数，并输出计算结果。