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* High level astrometric computations.
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
* Copyright: (C) 1993-2010 Emmanuel Bertin -- IAP/CNRS/UPMC
*
* License: GNU General Public License
*
* SExtractor is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* SExtractor is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with SExtractor. If not, see <http://www.gnu.org/licenses/>.
*
* Last modified: 11/10/2010
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "wcs/wcs.h"
#include "define.h"
#include "globals.h"
#include "prefs.h"
#include "astrom.h"
#include "wcs/tnx.h"
static obj2struct *obj2 = &outobj2;
/****************************** initastrom **********************************/
/*
Initialize astrometrical structures.
*/
void initastrom(picstruct *field)
{
if (FLAG(obj2.dtheta2000) || FLAG(obj2.dtheta1950))
if (fabs(wcs->equinox-2000.0)>0.003)
precess(wcs->equinox, 0.0, 90.0, 2000.0, &wcs->ap2000, &wcs->dp2000);
}
if (FLAG(obj2.theta1950) || FLAG(obj2.poserr_theta1950))
j2b(wcs->equinox, wcs->ap2000, wcs->dp2000, &wcs->ap1950, &wcs->dp1950);
}
}
/* Override astrometric definitions only if user supplies a pixel-scale */
if (prefs.pixel_scale == 0.0)
field->pixscale = wcs->pixscale*3600.0; /* in arcsec */
/***************************** astrom_pos **********************************/
Compute real FOCAL and WORLD coordinates according to FITS info.
void astrom_pos(picstruct *field, objstruct *obj)
wcsstruct *wcs;
double rawpos[NAXIS], wcspos[NAXIS],
wcs = field->wcs;
lng = wcs->lng;
lat = wcs->lat;
/* If working with WCS, compute FOCAL coordinates and local matrix */
if (FLAG(obj2.mxf))
{
rawpos[0] = obj2->posx;
rawpos[1] = obj2->posy;
raw_to_red(wcs, rawpos, wcspos);
obj2->mxf = wcspos[0];
obj2->myf = wcspos[1];
}
/* If working with WCS, compute WORLD coordinates and local matrix */
if (FLAG(obj2.mxw))
{
rawpos[0] = obj2->posx;
rawpos[1] = obj2->posy;
raw_to_wcs(wcs, rawpos, wcspos);
obj2->mxw = wcspos[0];
obj2->myw = wcspos[1];
if (lng != lat)
obj2->alphas = lng<lat? obj2->mxw : obj2->myw;
obj2->deltas = lng<lat? obj2->myw : obj2->mxw;
if (fabs(wcs->equinox-2000.0)>0.003)
precess(wcs->equinox, wcspos[lng<lat?0:1], wcspos[lng<lat?1:0],
2000.0, &obj2->alpha2000, &obj2->delta2000);
else
{
obj2->alpha2000 = lng<lat? obj2->mxw : obj2->myw;
obj2->delta2000 = lng<lat? obj2->myw : obj2->mxw;
}
if (FLAG(obj2.dtheta2000))
{
da = wcs->ap2000 - obj2->alpha2000;
dd = (sin(wcs->dp2000*DEG)
-sin(obj2->delta2000*DEG)*sin(obj2->deltas*DEG))
/(cos(obj2->delta2000*DEG)*cos(obj2->deltas*DEG));
dd = dd<1.0? (dd>-1.0?acos(dd)/DEG:180.0) : 0.0;
obj2->dtheta2000 = (((da>0.0 && da<180.0) || da<-180.0)?-dd:dd);
{
j2b(wcs->equinox, obj2->alpha2000, obj2->delta2000,
if (FLAG(obj2.dtheta1950))
{
da = wcs->ap1950 - obj2->alpha1950;
dd = (sin(wcs->dp1950*DEG)
-sin(obj2->delta1950*DEG)*sin(obj2->deltas*DEG))
/(cos(obj2->delta1950*DEG)*cos(obj2->deltas*DEG));
dd = dd<1.0? (dd>-1.0?acos(dd)/DEG:180.0) : 0.0;
obj2->dtheta1950 = (((da>0.0 && da<180.0) || da<-180.0)?-dd:dd);
}
}
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/* Custom coordinate system for the MAMA machine */
if (FLAG(obj2.mamaposx))
{
rawpos[0] = obj2->posx - 0.5;
rawpos[1] = obj2->posy - 0.5;
raw_to_wcs(wcs, rawpos, wcspos);
obj2->mamaposx = wcspos[1]*(MAMA_CORFLEX+1.0);
obj2->mamaposy = wcspos[0]*(MAMA_CORFLEX+1.0);
}
return;
}
/***************************** astrom_peakpos *******************************/
/*
Compute real FOCAL and WORLD peak coordinates according to FITS info.
*/
void astrom_peakpos(picstruct *field, objstruct *obj)
{
wcsstruct *wcs;
double rawpos[NAXIS], wcspos[NAXIS];
int lng,lat;
wcs = field->wcs;
lng = wcs->lng;
lat = wcs->lat;
if (FLAG(obj2.peakxf))
{
rawpos[0] = obj->peakx;
rawpos[1] = obj->peaky;
raw_to_red(wcs, rawpos, wcspos);
obj2->peakxf = wcspos[0];
obj2->peakyf = wcspos[1];
}
rawpos[0] = obj->peakx;
rawpos[1] = obj->peaky;
raw_to_wcs(wcs, rawpos, wcspos);
obj2->peakxw = wcspos[0];
obj2->peakyw = wcspos[1];
if (lng != lat)
obj2->peakalphas = lng<lat? obj2->peakxw : obj2->peakyw;
obj2->peakdeltas = lng<lat? obj2->peakyw : obj2->peakxw;
if (fabs(wcs->equinox-2000.0)>0.003)
precess(wcs->equinox, wcspos[lng<lat?0:1], wcspos[lng<lat?1:0],
2000.0, &obj2->peakalpha2000, &obj2->peakdelta2000);
else
{
obj2->peakalpha2000 = lng<lat? obj2->peakxw : obj2->peakyw;
obj2->peakdelta2000 = lng<lat? obj2->peakyw : obj2->peakxw;
j2b(wcs->equinox, obj2->peakalpha2000, obj2->peakdelta2000,
&obj2->peakalpha1950, &obj2->peakdelta1950);
}
}
}
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return;
}
/****************************** astrom_winpos *******************************/
/*
Compute real FOCAL and WORLD windowed coordinates according to FITS info.
*/
void astrom_winpos(picstruct *field, objstruct *obj)
{
wcsstruct *wcs;
double rawpos[NAXIS], wcspos[NAXIS];
int lng,lat;
wcs = field->wcs;
lng = wcs->lng;
lat = wcs->lat;
if (FLAG(obj2.winpos_xf))
{
rawpos[0] = obj2->winpos_x;
rawpos[1] = obj2->winpos_y;
raw_to_red(wcs, rawpos, wcspos);
obj2->winpos_xf = wcspos[0];
obj2->winpos_yf = wcspos[1];
}
rawpos[0] = obj2->winpos_x;
rawpos[1] = obj2->winpos_y;
raw_to_wcs(wcs, rawpos, wcspos);
obj2->winpos_xw = wcspos[0];
obj2->winpos_yw = wcspos[1];
if (lng != lat)
obj2->winpos_alphas = lng<lat? obj2->winpos_xw : obj2->winpos_yw;
obj2->winpos_deltas = lng<lat? obj2->winpos_yw : obj2->winpos_xw;
if (fabs(wcs->equinox-2000.0)>0.003)
precess(wcs->equinox, wcspos[0], wcspos[1],
2000.0, &obj2->winpos_alpha2000, &obj2->winpos_delta2000);
else
{
obj2->winpos_alpha2000 = lng<lat? obj2->winpos_xw : obj2->winpos_yw;
obj2->winpos_delta2000 = lng<lat? obj2->winpos_yw : obj2->winpos_xw;
j2b(wcs->equinox, obj2->winpos_alpha2000, obj2->winpos_delta2000,
&obj2->winpos_alpha1950, &obj2->winpos_delta1950);
}
}
return;
}
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/****************************** astrom_psfpos *******************************/
/*
Compute real FOCAL and WORLD PSF coordinates according to FITS info.
*/
void astrom_psfpos(picstruct *field, objstruct *obj)
{
wcsstruct *wcs;
double rawpos[NAXIS], wcspos[NAXIS];
int lng,lat;
wcs = field->wcs;
lng = wcs->lng;
lat = wcs->lat;
if (FLAG(obj2.xf_psf))
{
rawpos[0] = obj2->x_psf;
rawpos[1] = obj2->y_psf;
raw_to_red(wcs, rawpos, wcspos);
obj2->xf_psf = wcspos[0];
obj2->yf_psf = wcspos[1];
}
if (FLAG(obj2.xw_psf))
{
rawpos[0] = obj2->x_psf;
rawpos[1] = obj2->y_psf;
raw_to_wcs(wcs, rawpos, wcspos);
obj2->xw_psf = wcspos[0];
obj2->yw_psf = wcspos[1];
if (lng != lat)
{
obj2->alphas_psf = lng<lat? obj2->xw_psf : obj2->yw_psf;
obj2->deltas_psf = lng<lat? obj2->yw_psf : obj2->xw_psf;
if (FLAG(obj2.alpha2000_psf))
{
if (fabs(wcs->equinox-2000.0)>0.003)
precess(wcs->equinox, wcspos[0], wcspos[1],
2000.0, &obj2->alpha2000_psf, &obj2->delta2000_psf);
else
{
obj2->alpha2000_psf = lng<lat? obj2->xw_psf : obj2->yw_psf;
obj2->delta2000_psf = lng<lat? obj2->yw_psf : obj2->xw_psf;
}
if (FLAG(obj2.alpha1950_psf))
j2b(wcs->equinox, obj2->alpha2000_psf, obj2->delta2000_psf,
&obj2->alpha1950_psf, &obj2->delta1950_psf);
}
}
}
return;
}
/****************************** astrom_profpos *******************************/
/*
Compute real FOCAL and WORLD profit coordinates according to FITS info.
*/
void astrom_profpos(picstruct *field, objstruct *obj)
{
wcsstruct *wcs;
double rawpos[NAXIS], wcspos[NAXIS];
int lng,lat;
wcs = field->wcs;
lng = wcs->lng;
lat = wcs->lat;
if (FLAG(obj2.xf_prof))
{
rawpos[0] = obj2->x_prof;
rawpos[1] = obj2->y_prof;
raw_to_red(wcs, rawpos, wcspos);
obj2->xf_prof = wcspos[0];
obj2->yf_prof = wcspos[1];
}
if (FLAG(obj2.xw_prof))
{
rawpos[0] = obj2->x_prof;
rawpos[1] = obj2->y_prof;
raw_to_wcs(wcs, rawpos, wcspos);
obj2->xw_prof = wcspos[0];
obj2->yw_prof = wcspos[1];
if (lng != lat)
{
obj2->alphas_prof = lng<lat? obj2->xw_prof : obj2->yw_prof;
obj2->deltas_prof = lng<lat? obj2->yw_prof : obj2->xw_prof;
if (FLAG(obj2.alpha2000_prof))
{
if (fabs(wcs->equinox-2000.0)>0.003)
precess(wcs->equinox, wcspos[0], wcspos[1],
2000.0, &obj2->alpha2000_prof, &obj2->delta2000_prof);
else
{
obj2->alpha2000_prof = lng<lat? obj2->xw_prof : obj2->yw_prof;
obj2->delta2000_prof = lng<lat? obj2->yw_prof : obj2->xw_prof;
}
if (FLAG(obj2.alpha1950_prof))
j2b(wcs->equinox, obj2->alpha2000_prof, obj2->delta2000_prof,
&obj2->alpha1950_prof, &obj2->delta1950_prof);
}
}
}
return;
}
/****************************** astrom_shapeparam ****************************/
/*
Compute shape parameters in WORLD and SKY coordinates.
*/
void astrom_shapeparam(picstruct *field, objstruct *obj)
{
wcsstruct *wcs;
double dx2,dy2,dxy, xm2,ym2,xym, temp,pm2, lm0,lm1,lm2,lm3;
wcs = field->wcs;
naxis = wcs->naxis;
lng = wcs->lng;
lat = wcs->lat;
if (lng == lat)
{
lng = 0;
lat = 1;
}
lm0 = obj2->jacob[lng+naxis*lng];
lm1 = obj2->jacob[lat+naxis*lng];
lm2 = obj2->jacob[lng+naxis*lat];
lm3 = obj2->jacob[lat+naxis*lat];
/* All WORLD params based on 2nd order moments have to pass through here */
dx2 = obj->mx2;
dy2 = obj->my2;
dxy = obj->mxy;
obj2->mx2w = xm2 = lm0*lm0*dx2 + lm1*lm1*dy2 + lm0*lm1*dxy;
obj2->my2w = ym2 = lm2*lm2*dx2 + lm3*lm3*dy2 + lm2*lm3*dxy;
obj2->mxyw = xym = lm0*lm2*dx2 + lm1*lm3*dy2 + (lm0*lm3+lm1*lm2)*dxy;
temp=xm2-ym2;
if (FLAG(obj2.thetaw))
{
obj2->thetaw = fmod_m90_p90((temp == 0.0)?
(45.0) : (0.5*atan2(2.0 * xym,temp)/DEG));
/*-- Compute position angles in J2000 or B1950 reference frame */
if (FLAG(obj2.thetas))
obj2->thetas = fmod_m90_p90(lng<lat?
((obj2->thetaw>0.0?90:-90.0) - obj2->thetaw)
: obj2->thetaw);
obj2->theta2000 = fmod_m90_p90(obj2->thetas + obj2->dtheta2000);
obj2->theta1950 = fmod_m90_p90(obj2->thetas + obj2->dtheta1950);
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}
}
if (FLAG(obj2.aw))
{
temp = sqrt(0.25*temp*temp+xym*xym);
pm2 = 0.5*(xm2+ym2);
obj2->aw = (float)sqrt(pm2+temp);
obj2->bw = (float)sqrt(pm2-temp);
obj2->polarw = temp / pm2;
}
if (FLAG(obj2.cxxw))
{
/*-- Handle large, fully correlated profiles (can cause a singularity...) */
if ((temp=xm2*ym2-xym*xym)<1e-6)
{
temp = 1e-6;
xym *= 0.99999;
}
obj2->cxxw = (float)(ym2/temp);
obj2->cyyw = (float)(xm2/temp);
obj2->cxyw = (float)(-2*xym/temp);
}
return;
}
/**************************** astrom_winshapeparam ***************************/
/*
Compute shape parameters in WORLD and SKY coordinates.
*/
void astrom_winshapeparam(picstruct *field, objstruct *obj)
{
wcsstruct *wcs;
double dx2,dy2,dxy, xm2,ym2,xym, temp,pm2, lm0,lm1,lm2,lm3;
wcs = field->wcs;
naxis = wcs->naxis;
lng = wcs->lng;
lat = wcs->lat;
if (lng == lat)
{
lng = 0;
lat = 1;
}
lm0 = obj2->jacob[lng+naxis*lng];
lm1 = obj2->jacob[lat+naxis*lng];
lm2 = obj2->jacob[lng+naxis*lat];
lm3 = obj2->jacob[lat+naxis*lat];
/* All WORLD params based on 2nd order moments have to pass through here */
dx2 = obj2->win_mx2;
dy2 = obj2->win_my2;
dxy = obj2->win_mxy;
obj2->win_mx2w = xm2 = lm0*lm0*dx2 + lm1*lm1*dy2 + lm0*lm1*dxy;
obj2->win_my2w = ym2 = lm2*lm2*dx2 + lm3*lm3*dy2 + lm2*lm3*dxy;
obj2->win_mxyw = xym = lm0*lm2*dx2 + lm1*lm3*dy2 + (lm0*lm3+lm1*lm2)*dxy;
temp=xm2-ym2;
if (FLAG(obj2.win_thetaw))
{
obj2->win_thetaw = fmod_m90_p90((temp == 0.0)?
(45.0) : (0.5*atan2(2.0*xym,temp)/DEG));
/*-- Compute position angles in J2000 or B1950 reference frame */
if (FLAG(obj2.win_thetas))
obj2->win_thetas = fmod_m90_p90(lng<lat?
((obj2->win_thetaw>0.0?90:-90.0) - obj2->win_thetaw)
: obj2->win_thetaw);
obj2->win_theta2000 = fmod_m90_p90(obj2->win_thetas + obj2->dtheta2000);
obj2->win_theta1950 = fmod_m90_p90(obj2->win_thetas + obj2->dtheta1950);
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}
}
if (FLAG(obj2.win_aw))
{
temp = sqrt(0.25*temp*temp+xym*xym);
pm2 = 0.5*(xm2+ym2);
obj2->win_aw = (float)sqrt(pm2+temp);
obj2->win_bw = (float)sqrt(pm2-temp);
obj2->win_polarw = temp / pm2;
}
if (FLAG(obj2.win_cxxw))
{
/*-- Handle large, fully correlated profiles (can cause a singularity...) */
if ((temp=xm2*ym2-xym*xym)<1e-6)
{
temp = 1e-6;
xym *= 0.99999;
}
obj2->win_cxxw = (float)(ym2/temp);
obj2->win_cyyw = (float)(xm2/temp);
obj2->win_cxyw = (float)(-2*xym/temp);
}
return;
}
/******************************* astrom_errparam *****************************/
/*
Compute error ellipse parameters in WORLD and SKY coordinates.
*/
void astrom_errparam(picstruct *field, objstruct *obj)
{
wcsstruct *wcs;
double dx2,dy2,dxy, xm2,ym2,xym, temp,pm2, lm0,lm1,lm2,lm3;
wcs = field->wcs;
naxis = wcs->naxis;
lng = wcs->lng;
lat = wcs->lat;
if (lng == lat)
{
lng = 0;
lat = 1;
}
lm0 = obj2->jacob[lng+naxis*lng];
lm1 = obj2->jacob[lat+naxis*lng];
lm2 = obj2->jacob[lng+naxis*lat];
lm3 = obj2->jacob[lat+naxis*lat];
/* All WORLD params based on 2nd order moments have to pass through here */
dx2 = obj->poserr_mx2;
dy2 = obj->poserr_my2;
dxy = obj->poserr_mxy;
obj2->poserr_mx2w = xm2 = lm0*lm0*dx2 + lm1*lm1*dy2 + lm0*lm1*dxy;
obj2->poserr_my2w = ym2 = lm2*lm2*dx2 + lm3*lm3*dy2 + lm2*lm3*dxy;
obj2->poserr_mxyw = xym = lm0*lm2*dx2 + lm1*lm3*dy2 + (lm0*lm3+lm1*lm2)*dxy;
temp=xm2-ym2;
if (FLAG(obj2.poserr_thetaw))
{
obj2->poserr_thetaw = fmod_m90_p90((temp==0.0)?
(45.0):(0.5*atan2(2.0*xym,temp)/DEG));
/*-- Compute position angles in J2000 or B1950 reference frame */
if (FLAG(obj2.poserr_thetas))
obj2->poserr_thetas = fmod_m90_p90(lng<lat?
((obj2->poserr_thetaw>0.0?90:-90.0) - obj2->poserr_thetaw)
: obj2->poserr_thetaw);
obj2->poserr_theta2000 = fmod_m90_p90(obj2->poserr_thetas
+ obj2->dtheta2000);
obj2->poserr_theta1950 = fmod_m90_p90(obj2->poserr_thetas
+ obj2->dtheta1950);
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}
}
if (FLAG(obj2.poserr_aw))
{
temp = sqrt(0.25*temp*temp+xym*xym);
pm2 = 0.5*(xm2+ym2);
obj2->poserr_aw = (float)sqrt(pm2+temp);
obj2->poserr_bw = (float)sqrt(pm2-temp);
}
if (FLAG(obj2.poserr_cxxw))
{
/*-- Handle large, fully correlated profiles (can cause a singularity...) */
if ((temp=xm2*ym2-xym*xym)<1e-6)
{
temp = 1e-6;
xym *= 0.99999;
}
obj2->poserr_cxxw = (float)(ym2/temp);
obj2->poserr_cyyw = (float)(xm2/temp);
obj2->poserr_cxyw = (float)(-2*xym/temp);
}
return;
}
/***************************** astrom_winerrparam ***************************/
/*
Compute error ellipse parameters in WORLD and SKY coordinates.
*/
void astrom_winerrparam(picstruct *field, objstruct *obj)
{
wcsstruct *wcs;
double dx2,dy2,dxy, xm2,ym2,xym, temp,pm2, lm0,lm1,lm2,lm3;
wcs = field->wcs;
naxis = wcs->naxis;
lng = wcs->lng;
lat = wcs->lat;
if (lng == lat)
{
lng = 0;
lat = 1;
}
lm0 = obj2->jacob[lng+naxis*lng];
lm1 = obj2->jacob[lat+naxis*lng];
lm2 = obj2->jacob[lng+naxis*lat];
lm3 = obj2->jacob[lat+naxis*lat];
/* All WORLD params based on 2nd order moments have to pass through here */
dx2 = obj2->winposerr_mx2;
dy2 = obj2->winposerr_my2;
dxy = obj2->winposerr_mxy;
obj2->winposerr_mx2w = xm2 = lm0*lm0*dx2 + lm1*lm1*dy2 + lm0*lm1*dxy;
obj2->winposerr_my2w = ym2 = lm2*lm2*dx2 + lm3*lm3*dy2 + lm2*lm3*dxy;
obj2->winposerr_mxyw = xym = lm0*lm2*dx2 + lm1*lm3*dy2 + (lm0*lm3+lm1*lm2)*dxy;
temp=xm2-ym2;
if (FLAG(obj2.winposerr_thetaw))
{
obj2->winposerr_thetaw = (fmod_m90_p90(temp==0.0)?
(45.0):(0.5*atan2(2.0*xym,temp)/DEG));
/*-- Compute position angles in J2000 or B1950 reference frame */
if (FLAG(obj2.winposerr_thetas))
obj2->winposerr_thetas = fmod_m90_p90(lng<lat?
((obj2->winposerr_thetaw>0.0?90:-90.0) - obj2->winposerr_thetaw)
: obj2->winposerr_thetaw);
obj2->winposerr_theta2000 = fmod_m90_p90(obj2->winposerr_thetas
+ obj2->dtheta2000);
obj2->winposerr_theta1950 = fmod_m90_p90(obj2->winposerr_thetas
+ obj2->dtheta1950);
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}
}
if (FLAG(obj2.winposerr_aw))
{
temp = sqrt(0.25*temp*temp+xym*xym);
pm2 = 0.5*(xm2+ym2);
obj2->winposerr_aw = (float)sqrt(pm2+temp);
obj2->winposerr_bw = (float)sqrt(pm2-temp);
}
if (FLAG(obj2.winposerr_cxxw))
{
/*-- Handle large, fully correlated profiles (can cause a singularity...) */
if ((temp=xm2*ym2-xym*xym)<1e-6)
{
temp = 1e-6;
xym *= 0.99999;
}
obj2->winposerr_cxxw = (float)(ym2/temp);
obj2->winposerr_cyyw = (float)(xm2/temp);
obj2->winposerr_cxyw = (float)(-2*xym/temp);
}
return;
}
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/***************************** astrom_psferrparam ***************************/
/*
Compute error ellipse parameters in WORLD and SKY coordinates.
*/
void astrom_psferrparam(picstruct *field, objstruct *obj)
{
wcsstruct *wcs;
double dx2,dy2,dxy, xm2,ym2,xym, temp,pm2, lm0,lm1,lm2,lm3;
int lng,lat, naxis;
wcs = field->wcs;
naxis = wcs->naxis;
lng = wcs->lng;
lat = wcs->lat;
if (lng == lat)
{
lng = 0;
lat = 1;
}
lm0 = obj2->jacob[lng+naxis*lng];
lm1 = obj2->jacob[lat+naxis*lng];
lm2 = obj2->jacob[lng+naxis*lat];
lm3 = obj2->jacob[lat+naxis*lat];
/* All WORLD params based on 2nd order moments have to pass through here */
dx2 = obj2->poserrmx2_psf;
dy2 = obj2->poserrmy2_psf;
dxy = obj2->poserrmxy_psf;
obj2->poserrmx2w_psf = xm2 = lm0*lm0*dx2+lm1*lm1*dy2+lm0*lm1*dxy;
obj2->poserrmy2w_psf = ym2 = lm2*lm2*dx2+lm3*lm3*dy2+lm2*lm3*dxy;
obj2->poserrmxyw_psf = xym = lm0*lm2*dx2+lm1*lm3*dy2+(lm0*lm3+lm1*lm2)*dxy;
temp=xm2-ym2;
if (FLAG(obj2.poserrthetaw_psf))
{
obj2->poserrthetaw_psf = (fmod_m90_p90(temp==0.0)?
(45.0):(0.5*atan2(2.0*xym,temp)/DEG));
/*-- Compute position angles in J2000 or B1950 reference frame */
if (wcs->lng != wcs->lat)
{
if (FLAG(obj2.poserrthetas_psf))
obj2->poserrthetas_psf = fmod_m90_p90(lng<lat?
((obj2->poserrthetaw_psf>0.0?90:-90.0)-obj2->poserrthetaw_psf)
: obj2->poserrthetaw_psf);
if (FLAG(obj2.poserrtheta2000_psf))
obj2->poserrtheta2000_psf = fmod_m90_p90(obj2->poserrthetas_psf
+ obj2->dtheta2000);
if (FLAG(obj2.poserrtheta1950_psf))
obj2->poserrtheta1950_psf = fmod_m90_p90(obj2->poserrthetas_psf
+ obj2->dtheta1950);
}
}
if (FLAG(obj2.poserraw_psf))
{
temp = sqrt(0.25*temp*temp+xym*xym);
pm2 = 0.5*(xm2+ym2);
obj2->poserraw_psf = (float)sqrt(pm2+temp);
obj2->poserrbw_psf = (float)sqrt(pm2-temp);
}
if (FLAG(obj2.poserrcxxw_psf))
{
/*-- Handle large, fully correlated profiles (can cause a singularity...) */
if ((temp=xm2*ym2-xym*xym)<1e-6)
{
temp = 1e-6;
xym *= 0.99999;
}
obj2->poserrcxxw_psf = (float)(ym2/temp);
obj2->poserrcyyw_psf = (float)(xm2/temp);
obj2->poserrcxyw_psf = (float)(-2*xym/temp);
}
return;
}
/***************************** astrom_proferrparam ***************************/
Compute error ellipse parameters in WORLD and SKY coordinates.
void astrom_proferrparam(picstruct *field, objstruct *obj)
wcsstruct *wcs;
double dx2,dy2,dxy, xm2,ym2,xym, temp,pm2, lm0,lm1,lm2,lm3;
int lng,lat, naxis;
wcs = field->wcs;
naxis = wcs->naxis;
lng = wcs->lng;
lat = wcs->lat;
if (lng == lat)
lm0 = obj2->jacob[lng+naxis*lng];
lm1 = obj2->jacob[lat+naxis*lng];
lm2 = obj2->jacob[lng+naxis*lat];
lm3 = obj2->jacob[lat+naxis*lat];
/* All WORLD params based on 2nd order moments have to pass through here */
dx2 = obj2->poserrmx2_prof;
dy2 = obj2->poserrmy2_prof;
dxy = obj2->poserrmxy_prof;
obj2->poserrmx2w_prof = xm2 = lm0*lm0*dx2+lm1*lm1*dy2+lm0*lm1*dxy;
obj2->poserrmy2w_prof = ym2 = lm2*lm2*dx2+lm3*lm3*dy2+lm2*lm3*dxy;
obj2->poserrmxyw_prof = xym = lm0*lm2*dx2+lm1*lm3*dy2+(lm0*lm3+lm1*lm2)*dxy;
temp=xm2-ym2;
if (FLAG(obj2.poserrthetaw_prof))
{
obj2->poserrthetaw_prof = (fmod_m90_p90(temp==0.0)?
(45.0):(0.5*atan2(2.0*xym,temp)/DEG));
/*-- Compute position angles in J2000 or B1950 reference frame */
if (wcs->lng != wcs->lat)
{
if (FLAG(obj2.poserrthetas_prof))
obj2->poserrthetas_prof = fmod_m90_p90(lng<lat?
((obj2->poserrthetaw_prof>0.0?90:-90.0)-obj2->poserrthetaw_prof)
: obj2->poserrthetaw_prof);
if (FLAG(obj2.poserrtheta2000_prof))
obj2->poserrtheta2000_prof = fmod_m90_p90(obj2->poserrthetas_prof
+ obj2->dtheta2000);
if (FLAG(obj2.poserrtheta1950_prof))
obj2->poserrtheta1950_prof = fmod_m90_p90(obj2->poserrthetas_prof
+ obj2->dtheta1950);
}
}
temp = sqrt(0.25*temp*temp+xym*xym);
pm2 = 0.5*(xm2+ym2);
obj2->poserraw_prof = (float)sqrt(pm2+temp);
obj2->poserrbw_prof = (float)sqrt(pm2-temp);
if (FLAG(obj2.poserrcxxw_prof))
{
/*-- Handle large, fully correlated profiles (can cause a singularity...) */
if ((temp=xm2*ym2-xym*xym)<1e-6)
{
temp = 1e-6;
xym *= 0.99999;
}
obj2->poserrcxxw_prof = (float)(ym2/temp);
obj2->poserrcyyw_prof = (float)(xm2/temp);
obj2->poserrcxyw_prof = (float)(-2*xym/temp);
}
/*************************** astrom_profshapeparam ***************************/
Compute profile-fitting shape parameters in WORLD and SKY coordinates.
void astrom_profshapeparam(picstruct *field, objstruct *obj)
double mat[9], tempmat[9], mx2wcov[9], dpdmx2[6], cov[4],
dx2,dy2,dxy, xm2,ym2,xym, pm2, lm0,lm1,lm2,lm3, ct,st,
temp, invstemp, den, invden, dval;
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wcs = field->wcs;
naxis = wcs->naxis;
lng = wcs->lng;
lat = wcs->lat;
if (lng == lat)
{
lng = 0;
lat = 1;
}
lm0 = obj2->jacob[lng+naxis*lng];
lm1 = obj2->jacob[lat+naxis*lng];
lm2 = obj2->jacob[lng+naxis*lat];
lm3 = obj2->jacob[lat+naxis*lat];
/* Spheroid World coordinates */
obj2->prof_spheroid_thetaerrw=obj2->prof_spheroid_thetaerr; /* quick & dirty*/
if (FLAG(obj2.prof_spheroid_reffw))
{
ct = cos(obj2->prof_spheroid_theta*DEG);
st = sin(obj2->prof_spheroid_theta*DEG);
dx2 = obj2->prof_spheroid_reff*obj2->prof_spheroid_reff * (ct*ct
+ st*st * obj2->prof_spheroid_aspect*obj2->prof_spheroid_aspect);
dy2 = obj2->prof_spheroid_reff*obj2->prof_spheroid_reff * (st*st
+ ct*ct * obj2->prof_spheroid_aspect*obj2->prof_spheroid_aspect);
dxy = ct*st * obj2->prof_spheroid_reff*obj2->prof_spheroid_reff
*(1.0 - obj2->prof_spheroid_aspect*obj2->prof_spheroid_aspect);
xm2 = lm0*lm0*dx2 + lm1*lm1*dy2 + lm0*lm1*dxy;
ym2 = lm2*lm2*dx2 + lm3*lm3*dy2 + lm2*lm3*dxy;
xym = lm0*lm2*dx2 + lm1*lm3*dy2 + (lm0*lm3+lm1*lm2)*dxy;
temp=xm2-ym2;
if (FLAG(obj2.prof_spheroid_thetaw))
{
obj2->prof_spheroid_thetaw = fmod_m90_p90((temp == 0.0)?
(45.0) : (0.5*atan2(2.0 * xym,temp)/DEG));
if (wcs->lng != wcs->lat)
{
if (FLAG(obj2.prof_spheroid_thetas))
obj2->prof_spheroid_thetas = fmod_m90_p90(lng<lat?
((obj2->prof_spheroid_thetaw>0.0?90:-90.0)
- obj2->prof_spheroid_thetaw)
: obj2->prof_spheroid_thetaw);
if (FLAG(obj2.prof_spheroid_theta2000))
obj2->prof_spheroid_theta2000=fmod_m90_p90(obj2->prof_spheroid_thetas
+ obj2->dtheta2000);
if (FLAG(obj2.prof_spheroid_theta1950))
obj2->prof_spheroid_theta1950=fmod_m90_p90(obj2->prof_spheroid_thetas
+ obj2->dtheta1950);
}
}
temp = sqrt(0.25*temp*temp+xym*xym);
pm2 = 0.5*(xm2+ym2);
obj2->prof_spheroid_reffw = sqrt(pm2+temp);
obj2->prof_spheroid_refferrw = obj2->prof_spheroid_reff > 0.0?
obj2->prof_spheroid_refferr/obj2->prof_spheroid_reff
*obj2->prof_spheroid_reffw
: 0.0;
obj2->prof_spheroid_aspectw = (obj2->prof_spheroid_reffw>0.0 && pm2>temp)?
sqrt(pm2-temp) / obj2->prof_spheroid_reffw
: obj2->prof_spheroid_aspect;
obj2->prof_spheroid_aspecterrw = obj2->prof_spheroid_aspect > 0.0?
obj2->prof_spheroid_aspecterr/obj2->prof_spheroid_aspect
*obj2->prof_spheroid_aspectw
: 0.0;
}
/* Disk World coordinates */
obj2->prof_disk_thetaerrw = obj2->prof_disk_thetaerr; /* quick & dirty*/
if (FLAG(obj2.prof_disk_scalew))
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ct = cos(obj2->prof_disk_theta*DEG);
st = sin(obj2->prof_disk_theta*DEG);
dx2 = obj2->prof_disk_scale*obj2->prof_disk_scale * (ct*ct
+ st*st * obj2->prof_disk_aspect*obj2->prof_disk_aspect);
dy2 = obj2->prof_disk_scale*obj2->prof_disk_scale * (st*st
+ ct*ct * obj2->prof_disk_aspect*obj2->prof_disk_aspect);
dxy = ct*st * obj2->prof_disk_scale*obj2->prof_disk_scale
*(1.0 - obj2->prof_disk_aspect*obj2->prof_disk_aspect);
xm2 = lm0*lm0*dx2 + lm1*lm1*dy2 + lm0*lm1*dxy;
ym2 = lm2*lm2*dx2 + lm3*lm3*dy2 + lm2*lm3*dxy;
xym = lm0*lm2*dx2 + lm1*lm3*dy2 + (lm0*lm3+lm1*lm2)*dxy;
temp=xm2-ym2;
if (FLAG(obj2.prof_disk_thetaw))
{
obj2->prof_disk_thetaw = fmod_m90_p90((temp == 0.0)?
(45.0) : (0.5*atan2(2.0 * xym,temp)/DEG));
/*---- Compute position angles in J2000 or B1950 reference frame */
if (wcs->lng != wcs->lat)
{
if (FLAG(obj2.prof_disk_thetas))
obj2->prof_disk_thetas = fmod_m90_p90(lng<lat?
((obj2->prof_disk_thetaw>0.0?90:-90.0)
- obj2->prof_disk_thetaw)
: obj2->prof_disk_thetaw);
if (FLAG(obj2.prof_disk_theta2000))
obj2->prof_disk_theta2000 = fmod_m90_p90(obj2->prof_disk_thetas
+ obj2->dtheta2000);
if (FLAG(obj2.prof_disk_theta1950))
obj2->prof_disk_theta1950 = fmod_m90_p90(obj2->prof_disk_thetas
+ obj2->dtheta1950);
}
}
temp = sqrt(0.25*temp*temp+xym*xym);
pm2 = 0.5*(xm2+ym2);
obj2->prof_disk_scalew = sqrt(pm2+temp);
obj2->prof_disk_scaleerrw = obj2->prof_disk_scale > 0.0?
obj2->prof_disk_scaleerr/obj2->prof_disk_scale*obj2->prof_disk_scalew
: 0.0;
obj2->prof_disk_aspectw = (obj2->prof_disk_scalew>0.0 && pm2>temp)?
sqrt(pm2-temp) / obj2->prof_disk_scalew
: obj2->prof_disk_aspect;
obj2->prof_disk_aspecterrw = obj2->prof_disk_aspect > 0.0?
obj2->prof_disk_aspecterr/obj2->prof_disk_aspect*obj2->prof_disk_aspectw
: 0.0;
/*-- Arms World coordinates */
if (FLAG(obj2.prof_arms_scalew))
{
obj2->prof_arms_scalew = (obj2->prof_disk_scale > 0.0) ?
obj2->prof_arms_scale*obj2->prof_disk_scalew/obj2->prof_disk_scale
: 0.0;
obj2->prof_arms_scaleerrw = (obj2->prof_arms_scale > 0.0) ?
obj2->prof_arms_scaleerr/obj2->prof_arms_scale*obj2->prof_arms_scalew
: 0.0;
obj2->prof_arms_startw = (obj2->prof_disk_scale > 0.0) ?
obj2->prof_arms_start*obj2->prof_disk_scalew/obj2->prof_disk_scale
: 0.0;