/usr/include/astrometry/sip-utils.h is in libastrometry-dev 0.70+dfsg-1.
This file is owned by root:root, with mode 0o644.
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# This file is part of the Astrometry.net suite.
# Licensed under a 3-clause BSD style license - see LICENSE
*/
#ifndef SIP_UTILS_H
#define SIP_UTILS_H
#include "astrometry/sip.h"
double wcs_pixel_center_for_size(double size);
int sip_ensure_inverse_polynomials(sip_t* sip);
/**
sip->a_order, sip->b_order, sip->a, and sip->b must be set.
sip->ap_order and sip->bp_order must be set.
Computes sip->ap and sip->bp by inverting the forward polynomial evaluated
on a regular grid of points, NX x NY, between xlo,xhi and ylo,yhi.
If NX,NY are 0, a reasonable default will be chosen.
If xlo=xhi=0 or ylo=yhi=0, the bounds of the image (from
sip->wcstan.imagew/h) will be used.
*/
int sip_compute_inverse_polynomials(sip_t* sip, int NX, int NY,
double xlo, double xhi,
double ylo, double yhi);
/*
Finds stars that are inside the bounds of a given field (wcs).
One of "sip" or "tan" must be non-NULL; if "sip" is non-NULL it is used.
One of "xyz" or "radec" must be non-NULL. If both are non-NULL, xyz is used.
"N" indicates how many elements are in these arrays. "radec" are in degrees.
If "inds" is non-NULL, the indices of stars that are inside the field are
put there; otherwise a new int array is allocated and returned; it should
be free()'d.
The pixel (xy) positions are placed into a newly-allocated array at "xy",
unless "xy" is NULL.
The number of good stars is placed in Ngood, which must be non-NULL.
*/
int* sip_filter_stars_in_field(const sip_t* sip, const tan_t* tan,
const double* xyz, const double* radec,
int N,
double** xy, int* inds, int* Ngood);
/**
Returns the bounds of the image in RA,Dec space, approximately, by
walking the boundary of the image in steps of size "stepsize".
Return values satisfy:
-90 <= decmin <= decmax <= 90
ramin <= ramax
ramin may be < 0, or ramax > 360, if the image straddles RA=0.
*/
void sip_get_radec_bounds(const sip_t* wcs, int stepsize,
double* pramin, double* pramax,
double* pdecmin, double* pdecmax);
void sip_walk_image_boundary(const sip_t* wcs, double stepsize,
void (*callback)(const sip_t* wcs, double x, double y, double ra, double dec, void* token),
void* token);
// sets RA,Dec in degrees.
void sip_get_radec_center(const sip_t* wcs,
double* p_ra, double* p_dec);
void tan_get_radec_center(const tan_t* wcs,
double* p_ra, double* p_dec);
double sip_get_radius_deg(const sip_t* wcs);
double tan_get_radius_deg(const tan_t* wcs);
// RA hours:minutes:seconds, Dec degrees:minutes:seconds
void sip_get_radec_center_hms(const sip_t* wcs,
int* rah, int* ram, double* ras,
int* decsign, int* decd, int* decm, double* decs);
anbool sip_pixel_is_inside_image(const sip_t* wcs, double px, double py);
anbool sip_is_inside_image(const sip_t* wcs, double ra, double dec);
// Writes RA, Dec H:M:S and D:M:S strings.
void sip_get_radec_center_hms_string(const sip_t* wcs,
char* rastr, char* decstr);
void sip_get_field_size(const sip_t* wcs,
double* pw, double* ph,
char** units);
void sip_shift(const sip_t* sipin, sip_t* sipout,
double xlo, double xhi, double ylo, double yhi);
anbool tan_pixel_is_inside_image(const tan_t* wcs, double px, double py);
anbool tan_is_inside_image(const tan_t* wcs, double ra, double dec);
void tan_transform(const tan_t* tanin, tan_t* tanout,
double xlo, double xhi, double ylo, double yhi,
double scale);
void tan_scale(const tan_t* tanin, tan_t* tanout, double scale);
void sip_scale(const sip_t* tanin, sip_t* tanout, double scale);
void tan_rotate(const tan_t* tanin, tan_t* tanout, double rotate);
#endif
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