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August 29, 2015 14:05
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Coordinate system conversion between GCJ-02 and BD-09.
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#include <math.h> | |
const double x_pi = 3.14159265358979324 * 3000.0 / 180.0; | |
void bd_encrypt(double gg_lat, double gg_lon, double &bd_lat, double &bd_lon) | |
{ | |
double x = gg_lon, y = gg_lat; | |
double z = sqrt(x * x + y * y) + 0.00002 * sin(y * x_pi); | |
double theta = atan2(y, x) + 0.000003 * cos(x * x_pi); | |
bd_lon = z * cos(theta) + 0.0065; | |
bd_lat = z * sin(theta) + 0.006; | |
} | |
void bd_decrypt(double bd_lat, double bd_lon, double &gg_lat, double &gg_lon) | |
{ | |
double x = bd_lon - 0.0065, y = bd_lat - 0.006; | |
double z = sqrt(x * x + y * y) - 0.00002 * sin(y * x_pi); | |
double theta = atan2(y, x) - 0.000003 * cos(x * x_pi); | |
gg_lon = z * cos(theta); | |
gg_lat = z * sin(theta); | |
} |
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