布尔莎七参数法c++代码
时间: 2023-10-20 09:21:46 浏览: 75
以下是布尔莎七参数法的 C 代码实现:
```c
#include <stdio.h>
#include <math.h>
#define PI 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679
// 定义布尔莎七参数结构体
typedef struct {
double dx; // X 方向平移量(米)
double dy; // Y 方向平移量(米)
double dz; // Z 方向平移量(米)
double wx; // 绕 X 轴旋转角度(弧度)
double wy; // 绕 Y 轴旋转角度(弧度)
double wz; // 绕 Z 轴旋转角度(弧度)
double m; // 尺度变换系数(ppm)
} BursaParams;
// 布尔莎七参数法转换函数
void bursa_transform(double x0, double y0, double z0, double *x1, double *y1, double *z1, BursaParams params) {
double X0 = x0;
double Y0 = y0;
double Z0 = z0;
double tx = params.dx;
double ty = params.dy;
double tz = params.dz;
double wx = params.wx;
double wy = params.wy;
double wz = params.wz;
double m = 1 + params.m / 1e6;
double sin_wx = sin(wx);
double cos_wx = cos(wx);
double sin_wy = sin(wy);
double cos_wy = cos(wy);
double sin_wz = sin(wz);
double cos_wz = cos(wz);
double X1 = tx + m * (cos_wy * cos_wz * (X0 - tx) + cos_wy * sin_wz * (Y0 - ty) - sin_wy * (Z0 - tz));
double Y1 = ty + m * (sin_wx * sin_wy * cos_wz * (X0 - tx) + (cos_wx * cos_wz - sin_wx * sin_wy * sin_wz) * (Y0 - ty) + cos_wy * sin_wx * (Z0 - tz));
double Z1 = tz + m * (sin_wx * sin_wy * sin_wz * (X0 - tx) + (cos_wx * sin_wz + sin_wx * sin_wy * cos_wz) * (Y0 - ty) + cos_wy * cos_wx * (Z0 - tz));
*x1 = X1;
*y1 = Y1;
*z1 = Z1;
}
int main() {
// 假设我们有原始坐标(114.0, 30.0, 50.0)和对应的 WGS84 坐标(114.001, 30.001, 50.001)
double x0 = 114.0;
double y0 = 30.0;
double z0 = 50.0;
double x1 = 114.001;
double y1 = 30.001;
double z1 = 50.001;
// 计算布尔莎七参数
double dx = x1 - x0;
double dy = y1 - y0;
double dz = z1 - z0;
double wx = 0;
double wy = 0;
double wz = atan2(dy, dx); // 绕 Z 轴旋转角度为两点间的连线与正东方向的夹角
double m = (sqrt(dx * dx + dy * dy + dz * dz) / sqrt(x0 * x0 + y0 * y0 + z0 * z0)) * 1e6; // 尺度变换系数
BursaParams params = {dx, dy, dz, wx, wy, wz, m};
// 转换原始坐标
double x1_new, y1_new, z1_new;
bursa_transform(x0, y0, z0, &x1_new, &y1_new, &z1_new, params);
printf("转换后的坐标为:(%f, %f, %f)\n", x1_new, y1_new, z1_new);
return 0;
}
```
这里假设我们有原始坐标(114.0, 30.0, 50.0)和对应的 WGS84 坐标(114.001, 30.001, 50.001),然后通过计算得到布尔莎七参数,最后将原始坐标转换为 WGS84 坐标。
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