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| author | Frank Warmerdam <warmerdam@pobox.com> | 1999-03-18 16:34:52 +0000 |
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| committer | Frank Warmerdam <warmerdam@pobox.com> | 1999-03-18 16:34:52 +0000 |
| commit | 565a4bd035b9d4a83955808efef20f1d8dfa24cf (patch) | |
| tree | 75785fc897708023f1ccdaf40079afcbaaf0fd3a /src/PJ_tcea.c | |
| download | PROJ-565a4bd035b9d4a83955808efef20f1d8dfa24cf.tar.gz PROJ-565a4bd035b9d4a83955808efef20f1d8dfa24cf.zip | |
New
git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@776 4e78687f-474d-0410-85f9-8d5e500ac6b2
Diffstat (limited to 'src/PJ_tcea.c')
| -rw-r--r-- | src/PJ_tcea.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/PJ_tcea.c b/src/PJ_tcea.c new file mode 100644 index 00000000..caa8ab61 --- /dev/null +++ b/src/PJ_tcea.c @@ -0,0 +1,30 @@ +#ifndef lint +static const char SCCSID[]="@(#)PJ_tcea.c 4.1 94/02/15 GIE REL"; +#endif +#define PROJ_PARMS__ \ + double rk0; +#define PJ_LIB__ +#include <projects.h> +PROJ_HEAD(tcea, "Transverse Cylindrical Equal Area") "\n\tCyl, Sph"; +FORWARD(s_forward); /* spheroid */ + xy.x = P->rk0 * cos(lp.phi) * sin(lp.lam); + xy.y = P->k0 * (atan2(tan(lp.phi), cos(lp.lam)) - P->phi0); + return (xy); +} +INVERSE(s_inverse); /* spheroid */ + double t; + + xy.y = xy.y * P->rk0 + P->phi0; + xy.x *= P->k0; + t = sqrt(1. - xy.x * xy.x); + lp.phi = asin(t * sin(xy.y)); + lp.lam = atan2(xy.x, t * cos(xy.y)); + return (lp); +} +FREEUP; if (P) pj_dalloc(P); } +ENTRY0(tcea) + P->rk0 = 1 / P->k0; + P->inv = s_inverse; + P->fwd = s_forward; + P->es = 0.; +ENDENTRY(P) |