/Proj4/PJ_nzmg.c
C | 114 lines | 71 code | 6 blank | 37 comment | 6 complexity | da6f497d7eb9244acf1b797c06f512af MD5 | raw file
- /******************************************************************************
- * $Id: PJ_nzmg.c,v 1.3 2002/12/14 19:37:29 warmerda Exp $
- *
- * Project: PROJ.4
- * Purpose: Implementation of the nzmg (New Zealand Map Grid) projection.
- * Very loosely based upon DMA code by Bradford W. Drew
- * Author: Gerald Evenden
- *
- ******************************************************************************
- * Copyright (c) 1995, Gerald Evenden
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- ******************************************************************************
- *
- * $Log: PJ_nzmg.c,v $
- * Revision 1.3 2002/12/14 19:37:29 warmerda
- * updated headers
- *
- */
- /* */
- #define PJ_LIB__
- #include "projects.h"
- PJ_CVSID("$Id: PJ_nzmg.c,v 1.3 2002/12/14 19:37:29 warmerda Exp $");
- PROJ_HEAD(nzmg, "New Zealand Map Grid") "\n\tfixed Earth";
- #define EPSLN 1e-10
- #define SEC5_TO_RAD 0.4848136811095359935899141023
- #define RAD_TO_SEC5 2.062648062470963551564733573
- static COMPLEX
- bf[] = {
- {.7557853228, 0.0},
- {.249204646, .003371507},
- {-.001541739, .041058560},
- {-.10162907, .01727609},
- {-.26623489, -.36249218},
- {-.6870983, -1.1651967} };
- static double
- tphi[] = { 1.5627014243, .5185406398, -.03333098, -.1052906, -.0368594,
- .007317, .01220, .00394, -.0013 },
- tpsi[] = { .6399175073, -.1358797613, .063294409, -.02526853, .0117879,
- -.0055161, .0026906, -.001333, .00067, -.00034 };
- #define Nbf 5
- #define Ntpsi 9
- #define Ntphi 8
- FORWARD(e_forward); /* ellipsoid */
- COMPLEX p;
- double *C;
- int i;
- lp.phi = (lp.phi - P->phi0) * RAD_TO_SEC5;
- for (p.r = *(C = tpsi + (i = Ntpsi)); i ; --i)
- p.r = *--C + lp.phi * p.r;
- p.r *= lp.phi;
- p.i = lp.lam;
- p = pj_zpoly1(p, bf, Nbf);
- xy.x = p.i;
- xy.y = p.r;
- return xy;
- }
- INVERSE(e_inverse); /* ellipsoid */
- int nn, i;
- COMPLEX p, f, fp, dp;
- double den, *C;
- p.r = xy.y;
- p.i = xy.x;
- for (nn = 20; nn ;--nn) {
- f = pj_zpolyd1(p, bf, Nbf, &fp);
- f.r -= xy.y;
- f.i -= xy.x;
- den = fp.r * fp.r + fp.i * fp.i;
- p.r += dp.r = -(f.r * fp.r + f.i * fp.i) / den;
- p.i += dp.i = -(f.i * fp.r - f.r * fp.i) / den;
- if ((fabs(dp.r) + fabs(dp.i)) <= EPSLN)
- break;
- }
- if (nn) {
- lp.lam = p.i;
- for (lp.phi = *(C = tphi + (i = Ntphi)); i ; --i)
- lp.phi = *--C + p.r * lp.phi;
- lp.phi = P->phi0 + p.r * lp.phi * SEC5_TO_RAD;
- } else
- lp.lam = lp.phi = HUGE_VAL;
- return lp;
- }
- FREEUP; if (P) pj_dalloc(P); }
- ENTRY0(nzmg)
- /* force to International major axis */
- P->ra = 1. / (P->a = 6378388.0);
- P->lam0 = DEG_TO_RAD * 173.;
- P->phi0 = DEG_TO_RAD * -41.;
- P->x0 = 2510000.;
- P->y0 = 6023150.;
- P->inv = e_inverse; P->fwd = e_forward;
- ENDENTRY(P)