diff options
Diffstat (limited to 'src/3rdparty/proj/PJ_fahey.c')
| -rw-r--r-- | src/3rdparty/proj/PJ_fahey.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/3rdparty/proj/PJ_fahey.c b/src/3rdparty/proj/PJ_fahey.c new file mode 100644 index 00000000..93e9b38d --- /dev/null +++ b/src/3rdparty/proj/PJ_fahey.c @@ -0,0 +1,17 @@ +#define PJ_LIB__ +# include <projects.h> +PROJ_HEAD(fahey, "Fahey") "\n\tPcyl, Sph."; +#define TOL 1e-6 +FORWARD(s_forward); /* spheroid */ + xy.y = 1.819152 * ( xy.x = tan(0.5 * lp.phi) ); + xy.x = 0.819152 * lp.lam * asqrt(1 - xy.x * xy.x); + return (xy); +} +INVERSE(s_inverse); /* spheroid */ + lp.phi = 2. * atan(xy.y /= 1.819152); + lp.lam = fabs(xy.y = 1. - xy.y * xy.y) < TOL ? 0. : + xy.x / (0.819152 * sqrt(xy.y)); + return (lp); +} +FREEUP; if (P) pj_dalloc(P); } +ENTRY0(fahey) P->es = 0.; P->inv = s_inverse; P->fwd = s_forward; ENDENTRY(P) |