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#include <math.h>
#include "geo.h"
void geo2space(double *x, double *y, double *z, double lon, double lat)
{
*z = sin(lat / 180.0 * PI) * POLE_RADIUS;
*x = sin(lon / 180.0 * PI) * cos(lat / 180.0 * PI) * EQUATOR_RADIUS;
*y = -cos(lon / 180.0 * PI) * cos(lat / 180.0 * PI) * EQUATOR_RADIUS;
}
void space2geo(double *lon, double *lat, double x, double y, double z)
{
double r;
/* bring geoid to 1m radius */
z = z / POLE_RADIUS;
x = x / EQUATOR_RADIUS;
y = y / EQUATOR_RADIUS;
/* normalize */
r = sqrt(x * x + y * y + z * z);
z = z / r;
x = x / r;
y = y / r;
*lat = asin(z) / PI * 180;
*lon = atan2(x, -y) / PI * 180;
}
double distinspace(double x1, double y1, double z1, double x2, double y2,
double z2)
{
double x = x1 - x2;
double y = y1 - y2;
double z = z1 - z2;
return sqrt(x * x + y * y + z * z);
}
double distonplane(double x1, double y1, double x2, double y2)
{
double x = x1 - x2;
double y = y1 - y2;
return sqrt(x * x + y * y);
}
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