#define MERCLAT(x) (RAD2DEG * log(tan((0.25 * M_PI) + (0.5 * DEG2RAD * (x)))))
#define DEMERCLAT(x) (RAD2DEG * atan(sinh(DEG2RAD * (x))))
#define MERCLAT(x) (RAD2DEG * log(tan((0.25 * M_PI) + (0.5 * DEG2RAD * (x)))))
#define DEMERCLAT(x) (RAD2DEG * atan(sinh(DEG2RAD * (x))))