New

git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@776 4e78687f-474d-0410-85f9-8d5e500ac6b2

1 files changed, 174 insertions, 0 deletions

diff --git a/src/PJ_lsat.c b/src/PJ_lsat.c
new file mode 100644
index 00000000..ddde1224
--- /dev/null
+++ b/src/PJ_lsat.c
@@ -0,0 +1,174 @@
+#ifndef lint
+static const char SCCSID[]="@(#)PJ_lsat.c	4.1	94/02/15	GIE	REL";
+#endif
+/* based upon Snyder and Linck, USGS-NMD */
+#define PROJ_PARMS__ \
+    double a2, a4, b, c1, c3; \
+    double q, t, u, w, p22, sa, ca, xj, rlm, rlm2;
+#define PJ_LIB__
+#include	<projects.h>
+PROJ_HEAD(lsat, "Space oblique for LANDSAT")
+	"\n\tCyl, Sph&Ell\n\tlsat= path=";
+#define TOL 1e-7
+#define PI_HALFPI 4.71238898038468985766
+#define TWOPI_HALFPI 7.85398163397448309610
+	static void
+seraz0(double lam, double mult, PJ *P) {
+    double sdsq, h, s, fc, sd, sq, d__1;
+
+    lam *= DEG_TO_RAD;
+    sd = sin(lam);
+    sdsq = sd * sd;
+    s = P->p22 * P->sa * cos(lam) * sqrt((1. + P->t * sdsq) / ((
+	    1. + P->w * sdsq) * (1. + P->q * sdsq)));
+    d__1 = 1. + P->q * sdsq;
+    h = sqrt((1. + P->q * sdsq) / (1. + P->w * sdsq)) * ((1. + 
+	    P->w * sdsq) / (d__1 * d__1) - P->p22 * P->ca);
+    sq = sqrt(P->xj * P->xj + s * s);
+    P->b += fc = mult * (h * P->xj - s * s) / sq;
+    P->a2 += fc * cos(lam + lam);
+    P->a4 += fc * cos(lam * 4.);
+    fc = mult * s * (h + P->xj) / sq;
+    P->c1 += fc * cos(lam);
+    P->c3 += fc * cos(lam * 3.);
+}
+FORWARD(e_forward); /* ellipsoid */
+    int l, nn;
+    double lamt, xlam, sdsq, c, d, s, lamdp, phidp, lampp, tanph,
+		lamtp, cl, sd, sp, fac, sav, tanphi;
+
+	if (lp.phi > HALFPI)
+	    lp.phi = HALFPI;
+	else if (lp.phi < -HALFPI)
+	    lp.phi = -HALFPI;
+	lampp = lp.phi >= 0. ? HALFPI : PI_HALFPI;
+	tanphi = tan(lp.phi);
+	for (nn = 0;;) {
+		sav = lampp;
+		lamtp = lp.lam + P->p22 * lampp;
+		cl = cos(lamtp);
+		if (fabs(cl) < TOL)
+		    lamtp -= TOL;
+		fac = lampp - sin(lampp) * (cl < 0. ? -HALFPI : HALFPI);
+		for (l = 50; l; --l) {
+			lamt = lp.lam + P->p22 * sav;
+			if (fabs(c = cos(lamt)) < TOL)
+			    lamt -= TOL;
+			xlam = (P->one_es * tanphi * P->sa + sin(lamt) * P->ca) / c;
+			lamdp = atan(xlam) + fac;
+			if (fabs(fabs(sav) - fabs(lamdp)) < TOL)
+			    break;
+			sav = lamdp;
+		}
+		if (!l || ++nn >= 3 || (lamdp > P->rlm && lamdp < P->rlm2))
+			break;
+		if (lamdp <= P->rlm)
+		    lampp = TWOPI_HALFPI;
+		else if (lamdp >= P->rlm2)
+		    lampp = HALFPI;
+	}
+	if (l) {
+		sp = sin(lp.phi);
+		phidp = aasin((P->one_es * P->ca * sp - P->sa * cos(lp.phi) * 
+			sin(lamt)) / sqrt(1. - P->es * sp * sp));
+		tanph = log(tan(FORTPI + .5 * phidp));
+		sd = sin(lamdp);
+		sdsq = sd * sd;
+		s = P->p22 * P->sa * cos(lamdp) * sqrt((1. + P->t * sdsq)
+			 / ((1. + P->w * sdsq) * (1. + P->q * sdsq)));
+		d = sqrt(P->xj * P->xj + s * s);
+		xy.x = P->b * lamdp + P->a2 * sin(2. * lamdp) + P->a4 *
+			sin(lamdp * 4.) - tanph * s / d;
+		xy.y = P->c1 * sd + P->c3 * sin(lamdp * 3.) + tanph * P->xj / d;
+	} else
+		xy.x = xy.y = HUGE_VAL;
+	return xy;
+}
+INVERSE(e_inverse); /* ellipsoid */
+    int nn;
+    double lamt, sdsq, s, lamdp, phidp, sppsq, dd, sd, sl, fac, scl, sav, spp;
+
+	lamdp = xy.x / P->b;
+	nn = 50;
+	do {
+		sav = lamdp;
+		sd = sin(lamdp);
+		sdsq = sd * sd;
+		s = P->p22 * P->sa * cos(lamdp) * sqrt((1. + P->t * sdsq)
+			 / ((1. + P->w * sdsq) * (1. + P->q * sdsq)));
+		lamdp = xy.x + xy.y * s / P->xj - P->a2 * sin(
+			2. * lamdp) - P->a4 * sin(lamdp * 4.) - s / P->xj * (
+			P->c1 * sin(lamdp) + P->c3 * sin(lamdp * 3.));
+		lamdp /= P->b;
+	} while (fabs(lamdp - sav) >= TOL && --nn);
+	sl = sin(lamdp);
+	fac = exp(sqrt(1. + s * s / P->xj / P->xj) * (xy.y - 
+		P->c1 * sl - P->c3 * sin(lamdp * 3.)));
+	phidp = 2. * (atan(fac) - FORTPI);
+	dd = sl * sl;
+	if (fabs(cos(lamdp)) < TOL)
+	    lamdp -= TOL;
+	spp = sin(phidp);
+	sppsq = spp * spp;
+	lamt = atan(((1. - sppsq * P->rone_es) * tan(lamdp) * 
+		P->ca - spp * P->sa * sqrt((1. + P->q * dd) * (
+		1. - sppsq) - sppsq * P->u) / cos(lamdp)) / (1. - sppsq 
+		* (1. + P->u)));
+	sl = lamt >= 0. ? 1. : -1.;
+	scl = cos(lamdp) >= 0. ? 1. : -1;
+	lamt -= HALFPI * (1. - scl) * sl;
+	lp.lam = lamt - P->p22 * lamdp;
+	if (fabs(P->sa) < TOL)
+	    lp.phi = aasin(spp / sqrt(P->one_es * P->one_es + P->es * sppsq));
+	else
+		lp.phi = atan((tan(lamdp) * cos(lamt) - P->ca * sin(lamt)) /
+			(P->one_es * P->sa));
+	return lp;
+}
+FREEUP; if (P) pj_dalloc(P); }
+ENTRY0(lsat)
+    int land, path;
+    double lam, alf, esc, ess;
+
+	land = pj_param(P->params, "ilsat").i;
+	if (land <= 0 || land > 5) E_ERROR(-28);
+	path = pj_param(P->params, "ipath").i;
+	if (path <= 0 || path > (land <= 3 ? 251 : 233)) E_ERROR(-29);
+	if (land <= 3) {
+		P->lam0 = DEG_TO_RAD * 128.87 - TWOPI / 251. * path;
+	    P->p22 = 103.2669323;
+	    alf = DEG_TO_RAD * 99.092;
+	} else {
+		P->lam0 = DEG_TO_RAD * 129.3 - TWOPI / 233. * path;
+	    P->p22 = 98.8841202;
+	    alf = DEG_TO_RAD * 98.2;
+	}
+	P->p22 /= 1440.;
+	P->sa = sin(alf);
+	P->ca = cos(alf);
+	if (fabs(P->ca) < 1e-9)
+	    P->ca = 1e-9;
+	esc = P->es * P->ca * P->ca;
+	ess = P->es * P->sa * P->sa;
+	P->w = (1. - esc) * P->rone_es;
+	P->w = P->w * P->w - 1.;
+	P->q = ess * P->rone_es;
+	P->t = ess * (2. - P->es) * P->rone_es * P->rone_es;
+	P->u = esc * P->rone_es;
+	P->xj = P->one_es * P->one_es * P->one_es;
+	P->rlm = PI * (1. / 248. + .5161290322580645);
+	P->rlm2 = P->rlm + TWOPI;
+    P->a2 = P->a4 = P->b = P->c1 = P->c3 = 0.;
+	seraz0(0., 1., P);
+	for (lam = 9.; lam <= 81.0001; lam += 18.)
+	    seraz0(lam, 4., P);
+	for (lam = 18; lam <= 72.0001; lam += 18.)
+	    seraz0(lam, 2., P);
+	seraz0(90., 1., P);
+	P->a2 /= 30.;
+	P->a4 /= 60.;
+	P->b /= 30.;
+	P->c1 /= 15.;
+	P->c3 /= 45.;
+	P->inv = e_inverse; P->fwd = e_forward;
+ENDENTRY(P)