60             >::type calc_t;  in apply()  typedef
62         calc_t d1 = 0.001; // m_strategy.apply(sp1, p);  in apply()
64         calc_t lon1 = geometry::get_as_radian<0>(p1);  in apply()
65         calc_t lat1 = geometry::get_as_radian<1>(p1);  in apply()
66         calc_t lon2 = geometry::get_as_radian<0>(p2);  in apply()
67         calc_t lat2 = geometry::get_as_radian<1>(p2);  in apply()
68         calc_t lon = geometry::get_as_radian<0>(p);  in apply()
69         calc_t lat = geometry::get_as_radian<1>(p);  in apply()
71         calc_t crs_AD = geometry::formula::spherical_azimuth<calc_t, false>  in apply()
74         calc_t crs_AB = geometry::formula::spherical_azimuth<calc_t, false>  in apply()
77         calc_t XTD = asin(sin(d1) * sin(crs_AD - crs_AB));  in apply()