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#include <u.h>
#include <libc.h>
#include "geodesic.h"
typedef struct Geomodel Geomodel;
struct Geomodel
{
double a; /* equatorial radius */
double f; /* flattening */
};
Geomodel WGS84 = { 6378137, 1/298.257223563 };
void
usage(void)
{
fprint(2, "usage: %s lat0 lon0 lat1 lon1\n", argv0);
exits("usage");
}
void
main(int argc, char *argv[])
{
Geodesic g;
double lat0, lon0, lat1, lon1;
double s12;
ARGBEGIN{
default: usage();
}ARGEND;
if(argc != 4)
usage();
lat0 = strtod(argv[0], nil);
lon0 = strtod(argv[1], nil);
lat1 = strtod(argv[2], nil);
lon1 = strtod(argv[3], nil);
initgeod(&g, WGS84.a, WGS84.f);
inversegeod(&g, lat0, lon0, lat1, lon1, &s12, nil, nil);
print("%gm\n", s12);
}
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