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/* general inverse projection */
#define PJ_LIB__
#include <projects.h>
#include <errno.h>
# define EPS 1.0e-12
LPZ /* inverse projection entry */
pj_inv3d(XYZ xyz, PJ *P) {
LPZ lpz;
/* can't do as much preliminary checking as with forward */
if (xyz.x == HUGE_VAL || xyz.y == HUGE_VAL || xyz.z == HUGE_VAL ) {
lpz.lam = lpz.phi = lpz.z = HUGE_VAL;
pj_ctx_set_errno( P->ctx, -15);
return lpz;
}
errno = pj_errno = 0;
P->ctx->last_errno = 0;
xyz.x = (xyz.x * P->to_meter - P->x0) * P->ra; /* descale and de-offset */
xyz.y = (xyz.y * P->to_meter - P->y0) * P->ra;
/* z is not scaled since that is handled by vto_meter before we get here */
/* Check for NULL pointer */
if (P->inv3d != NULL)
{
lpz = (*P->inv3d)(xyz, P); /* inverse project */
if (P->ctx->last_errno )
lpz.lam = lpz.phi = lpz.z = HUGE_VAL;
else {
lpz.lam += P->lam0; /* reduce from del lp.lam */
if (!P->over)
lpz.lam = adjlon(lpz.lam); /* adjust longitude to CM */
/* This may be redundant and never used */
if (P->geoc && fabs(fabs(lpz.phi)-M_HALFPI) > EPS)
lpz.phi = atan(P->one_es * tan(lpz.phi));
}
}
else
{
lpz.lam = lpz.phi = lpz.z = HUGE_VAL;
}
return lpz;
}
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