/usr/include/astrometry/fit-wcs.h is in astrometry.net 0.46-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This file is part of the Astrometry.net suite.
Copyright 2006, 2007 Dustin Lang, Keir Mierle and Sam Roweis.
Copyright 2012 Dustin Lang.
The Astrometry.net suite 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, version 2.
The Astrometry.net suite 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 the Astrometry.net suite ; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef FIT_WCS_H
#define FIT_WCS_H
#include "sip.h"
#include "starkd.h"
/**
Move the tangent point to the given CRPIX, keeping the corresponding
stars in "starxyz" and "fieldxy" aligned. It's assumed that "tanin"
contains a reasonably close WCS solution (eg, from
fit_wcs). The output is put in "tanout". You might want
to iterate this process, though in my tests the adjustments in the
second iteration are very minor.
*/
int fit_tan_wcs_move_tangent_point(const double* starxyz,
const double* fieldxy,
int N,
const double* crpix,
const tan_t* tanin,
tan_t* tanout);
int fit_tan_wcs_move_tangent_point_weighted(const double* starxyz,
const double* fieldxy,
const double* weights,
int N,
const double* crpix,
const tan_t* tanin,
tan_t* tanout);
/*
Computes a rigid (conformal) TAN WCS projection, based on the correspondence
between stars and field objects.
. starxyz is an array of star positions on the unit sphere.
. fieldxy is an array of pixel coordinates.
. nobjs is the number of correspondences; the star at
. (starxyz + i*3) corresponds with the field object at (fieldxy + i*2).
If "p_scale" is specified, the scale of the field will be placed in it.
It is in units of degrees per pixel.
*/
int fit_tan_wcs(const double* starxyz,
const double* fieldxy,
int nobjs,
// output:
tan_t* wcstan,
double* p_scale);
int fit_tan_wcs_weighted(const double* starxyz,
const double* fieldxy,
const double* weights,
int N,
// output:
tan_t* tan,
double* p_scale);
#endif
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