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sattools/src/plotfits.c

663 lines
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C
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <wcslib/cel.h>
#include <cpgplot.h>
#include "qfits.h"
#include <gsl/gsl_multifit.h>
#include <getopt.h>
#define LIM 256
#define D2R M_PI/180.0
#define R2D 180.0/M_PI
#define NMAX 4096
struct star {
double ra,de;
float pmra,pmde;
float mag;
};
struct image {
int naxis1,naxis2,naxis3;
float *z;
float zmin,zmax;
double ra0,de0;
float x0,y0;
float a[3],b[3];
double mjd;
} img;
struct catalog {
int n;
float x[NMAX],y[NMAX],mag[NMAX];
double ra[NMAX],de[NMAX],rx[NMAX],ry[NMAX];
int select[NMAX];
};
struct map {
double lat,lng;
float alt;
int site_id;
char observer[32];
} m;
struct image read_fits(char *filename,int pnum);
int fgetline(FILE *,char *,int);
void forward(double ra0,double de0,double ra,double de,double *x,double *y);
void reverse(double,double,double,double,double *,double *);
void lfit2d(float *x,float *y,float *z,int n,float *a);
struct catalog read_pixel_catalog(char *filename);
double gmst(double mjd);
double modulo(double x,double y);
void precess(double mjd0,double ra0,double de0,double mjd,double *ra,double *de);
double s2dec(char *s);
// Read astrometric catalog
struct catalog read_astrometric_catalog(char *filename,float mmin,float sx,float sy,float angle)
{
int i=0;
FILE *file;
char line[LIM];
struct catalog c;
double rx,ry,x,y,ra,de;
struct star s;
double d,dx,dy;
double mjd0=51544.5;
file=fopen(filename,"rb");
if (file==NULL) {
fprintf(stderr,"%s not found!\n",filename);
exit(0);
}
while (!feof(file)) {
fread(&s,sizeof(struct star),1,file);
if (s.mag>mmin)
continue;
precess(mjd0,s.ra,s.de,img.mjd,&ra,&de);
forward(img.ra0,img.de0,ra,de,&rx,&ry);
x=img.x0+1.0/sx*(cos(angle*D2R)*rx+sin(angle*D2R)*ry);
y=img.y0+1.0/sy*(-sin(angle*D2R)*rx+cos(angle*D2R)*ry);
/*
} else if (t.state==1) {
dx=rx-t.a[0];
dy=ry-t.b[0];
d=t.a[1]*t.b[2]-t.a[2]*t.b[1];
x=(t.b[2]*dx-t.a[2]*dy)/d;
y=(t.a[1]*dy-t.b[1]*dx)/d;
}
*/
if (x>0.0 && x<img.naxis1 && y>0.0 && y<img.naxis2) {
c.x[i]=x;
c.y[i]=y;
c.rx[i]=rx;
c.ry[i]=ry;
c.ra[i]=s.ra;
c.de[i]=s.de;
c.mag[i]=s.mag;
c.select[i]=0;
i++;
}
}
fclose(file);
c.n=i;
return c;
}
// Read astrometric catalog
struct catalog reread_astrometric_catalog(char *filename,float mmin)
{
int i=0;
FILE *file;
char line[LIM];
struct catalog c;
double rx,ry,x,y;
struct star s;
double d,dx,dy,ra,de;
double mjd0=51544.5;
file=fopen(filename,"rb");
while (!feof(file)) {
fread(&s,sizeof(struct star),1,file);
if (s.mag>mmin)
continue;
precess(mjd0,s.ra,s.de,img.mjd,&ra,&de);
forward(img.ra0,img.de0,ra,de,&rx,&ry);
dx=rx-img.a[0];
dy=ry-img.b[0];
d=img.a[1]*img.b[2]-img.a[2]*img.b[1];
x=(img.b[2]*dx-img.a[2]*dy)/d+img.x0;
y=(img.a[1]*dy-img.b[1]*dx)/d+img.y0;
if (x>0.0 && x<img.naxis1 && y>0.0 && y<img.naxis2) {
c.x[i]=x;
c.y[i]=y;
c.rx[i]=rx;
c.ry[i]=ry;
c.ra[i]=s.ra;
c.de[i]=s.de;
c.mag[i]=s.mag;
c.select[i]=0;
i++;
}
}
fclose(file);
c.n=i;
return c;
}
int select_nearest(struct catalog c,float x,float y)
{
int i,imin;
float r,rmin;
for (i=0;i<c.n;i++) {
r=sqrt(pow(x-c.x[i],2)+pow(y-c.y[i],2));
if (i==0 || r<rmin) {
imin=i;
rmin=r;
}
}
return imin;
}
// Fit transformation
void fit_transformation(struct catalog cat,struct catalog ast,int nselect)
{
int i,j;
float *x,*y,*rx,*ry;
x=(float *) malloc(sizeof(float)*nselect);
y=(float *) malloc(sizeof(float)*nselect);
rx=(float *) malloc(sizeof(float)*nselect);
ry=(float *) malloc(sizeof(float)*nselect);
for (i=0;i<nselect;i++) {
for (j=0;j<cat.n;j++) {
if (cat.select[j]==i+1) {
x[i]=cat.x[j]-img.x0;
y[i]=cat.y[j]-img.y0;
}
}
for (j=0;j<ast.n;j++) {
if (ast.select[j]==i+1) {
rx[i]=ast.rx[j];
ry[i]=ast.ry[j];
}
}
}
lfit2d(x,y,rx,nselect,img.a);
lfit2d(x,y,ry,nselect,img.b);
return;
}
int match_catalogs(struct catalog *cat,struct catalog *ast,float rmax)
{
int i,j,jmin,n,flag=0;
float r,rmin;
FILE *file;
// Reset
for (i=0;i<cat->n;i++)
cat->select[i]=0;
for (i=0;i<ast->n;i++)
ast->select[i]=0;
file=fopen("out.dat","w");
for (i=0,n=0;i<cat->n;i++) {
for (j=0,flag=0;j<ast->n;j++) {
if (ast->select[j]!=0)
continue;
r=sqrt(pow(cat->x[i]-ast->x[j],2)+pow(cat->y[i]-ast->y[j],2));
if (flag==0 || r<rmin) {
rmin=r;
jmin=j;
flag=1;
}
}
if (rmin<rmax) {
fprintf(file,"%10.4f %10.4f %10.6f %10.6f\n",cat->x[i]-img.x0,cat->y[i]-img.y0,ast->ra[jmin],ast->de[jmin]);
cat->select[i]=n+1;
ast->select[jmin]=n+1;
n++;
}
}
fclose(file);
printf("%d stars matched\n",n);
return n;
}
// Get observing site
void get_site(int site_id)
{
int i=0;
char line[LIM];
FILE *file;
int id;
double lat,lng;
float alt;
char abbrev[3],observer[64],filename[LIM],*env;
env=getenv("ST_DATADIR");
sprintf(filename,"%s/data/sites.txt",env);
file=fopen(filename,"r");
if (file==NULL) {
printf("File with site information not found!\n");
return;
}
while (fgets(line,LIM,file)!=NULL) {
// Skip
if (strstr(line,"#")!=NULL)
continue;
// Strip newline
line[strlen(line)-1]='\0';
// Read data
sscanf(line,"%4d %2s %lf %lf %f",
&id,abbrev,&lat,&lng,&alt);
strcpy(observer,line+38);
// Change to km
alt/=1000.0;
if (id==site_id) {
m.lat=lat;
m.lng=lng;
m.alt=alt;
m.site_id=id;
strcpy(m.observer,observer);
}
}
fclose(file);
return;
}
int main(int argc,char *argv[])
{
int i;
float tr[]={-0.5,1.0,0.0,-0.5,0.0,1.0};
float heat_l[] = {0.0, 0.2, 0.4, 0.6, 1.0};
float heat_r[] = {0.0, 0.5, 1.0, 1.0, 1.0};
float heat_g[] = {0.0, 0.0, 0.5, 1.0, 1.0};
float heat_b[] = {0.0, 0.0, 0.0, 0.3, 1.0};
float x,y,r,rmin=1.0,rmax=10.0,mmin=5.0,mmax=10.0;
struct catalog cat,ast;
char c;
int redraw=1,click=0,nselect=0,plotstars=1;
char filename[128],sra[20],sde[20];
float h,q,s=0.0,mag=9;
FILE *file;
char *env,starfile[128];
// Environment variables
env=getenv("ST_DATADIR");
sprintf(starfile,"%s/data/tycho2.dat",env);
// Geographic position
env=getenv("ST_COSPAR");
get_site(atoi(env));
// Read image
img=read_fits(argv[1],0);
sprintf(filename,"%s.cat",argv[1]);
printf("Image read\n");
// Initial transformation
if (argc==7) {
s=atof(argv[2]);
img.ra0=atof(argv[3]);
img.de0=atof(argv[4]);
q=atof(argv[5]);
mag=atof(argv[6]);
} else {
file=fopen("position.txt","r");
if (file==NULL) {
fprintf(stderr,"No position file found\n");
return 0;
}
fscanf(file,"%s %s",sra,sde);
fclose(file);
// Get parameters
img.ra0=15.0*s2dec(sra);
img.de0=s2dec(sde);
// Hour angle
h=gmst(img.mjd)+m.lng-img.ra0;
q=atan2(sin(h*D2R),(tan(m.lat*D2R)*cos(img.de0*D2R)-sin(img.de0*D2R)*cos(h*D2R)))*R2D;
printf("Hour angle: %.3f deg, parallactic angle: %.3f deg\n",h,q);
}
img.x0=0.5*(float) img.naxis1;
img.y0=0.5*(float) img.naxis2;
// Read catalogs
cat=read_pixel_catalog(filename);
if (s==0.0)
ast=read_astrometric_catalog(starfile,mag,-36.15,33.22,-q);
else
ast=read_astrometric_catalog(starfile,mag,-s,s,-q);
// Plot image
cpgopen("/xs");
cpgwnad(0.0,img.naxis1,0.0,img.naxis2);
cpgsfs(2);
cpgctab (heat_l,heat_r,heat_g,heat_b,5,1.0,0.5);
// For ever loop
for (;;) {
if (redraw==1) {
cpgimag(img.z,img.naxis1,img.naxis2,1,img.naxis1,1,img.naxis2,img.zmin,img.zmax,tr);
cpgbox("BCTSNI",0.,0,"BCTSNI",0.,0);
// Plot catalogs
if (plotstars==1) {
cpgsci(3);
for (i=0;i<cat.n;i++) {
if (cat.select[i]!=0)
cpgpt1(cat.x[i],cat.y[i],6);
else
cpgpt1(cat.x[i],cat.y[i],4);
}
}
cpgsci(4);
for (i=0;i<ast.n;i++) {
r=rmax-(rmax-rmin)*(ast.mag[i]-mmin)/(mmax-mmin);
// Upscale for image size
r*=img.naxis1/752.0;
if (ast.select[i]!=0)
cpgpt1(ast.x[i],ast.y[i],6);
cpgcirc(ast.x[i],ast.y[i],r);
}
cpgsci(1);
redraw=0;
}
cpgcurs(&x,&y,&c);
// Quit
if (c=='q')
break;
// Fit
if (c=='f' && nselect>=3) {
fit_transformation(cat,ast,nselect);
ast=reread_astrometric_catalog(starfile,mag+1);
redraw=1;
}
// Reread
if (c=='r') {
ast=reread_astrometric_catalog(starfile,mag+1);
redraw=1;
}
// Select pixel catalog
if (c=='a' && click==0) {
i=select_nearest(cat,x,y);
cat.select[i]=nselect+1;
redraw=1;
click=1;
}
// Select catalog
if (c=='b' && click==1) {
i=select_nearest(ast,x,y);
ast.select[i]=nselect+1;
redraw=1;
click=0;
nselect++;
}
//
if (c=='p') {
if (plotstars==1)
plotstars=0;
else if (plotstars==0)
plotstars=1;
redraw=1;
}
// Match catalogs
if (c=='m') {
nselect=match_catalogs(&cat,&ast,10.0);
redraw=1;
}
}
cpgend();
return 0;
}
// Read fits image
struct image read_fits(char *filename,int pnum)
{
int i,j,k,l,m;
qfitsloader ql;
char key[FITS_LINESZ+1] ;
struct image img;
double s1,s2,avg,std;
// Set plane
ql.xtnum = 0;
ql.pnum = pnum;
// Set loadtype
ql.ptype = PTYPE_FLOAT;
// Set filename
ql.filename=filename;
// Image size
img.naxis1=atoi(qfits_query_hdr(filename,"NAXIS1"));
img.naxis2=atoi(qfits_query_hdr(filename,"NAXIS2"));
img.mjd=atof(qfits_query_hdr(filename,"MJD-OBS"));
// Initialize load
if (qfitsloader_init(&ql) != 0)
printf("Error initializing data loading\n");
// Test load
if (qfits_loadpix(&ql) != 0)
printf("Error loading actual data\n");
// Allocate image memory
img.z=(float *) malloc(sizeof(float) * img.naxis1*img.naxis2);
// Fill z array
for (i=0,l=0,m=0;i<img.naxis1;i++) {
for (j=0;j<img.naxis2;j++) {
img.z[l]=ql.fbuf[l];
l++;
}
}
// Get levels
for (i=0,s1=0.0,s2=0.0;i<img.naxis1*img.naxis2;i++) {
s1+=img.z[i];
s2+=img.z[i]*img.z[i];
}
avg=s1/(float) (img.naxis1*img.naxis2);
std=sqrt(s2/(float) (img.naxis1*img.naxis2)-avg*avg);
printf("%f %f\n",avg,std);
img.zmin=avg-4.0*std;
img.zmax=avg+6.0*std;
return img;
}
// Read a line of maximum length int lim from file FILE into string s
int fgetline(FILE *file,char *s,int lim)
{
int c,i=0;
while (--lim > 0 && (c=fgetc(file)) != EOF && c != '\n')
s[i++] = c;
if (c == '\n')
s[i++] = c;
s[i] = '\0';
return i;
}
// Linear 2D fit
void lfit2d(float *x,float *y,float *z,int n,float *a)
{
int i;
double chisq;
gsl_matrix *X,*cov;
gsl_vector *yy,*w,*c;
X=gsl_matrix_alloc(n,3);
yy=gsl_vector_alloc(n);
w=gsl_vector_alloc(n);
c=gsl_vector_alloc(3);
cov=gsl_matrix_alloc(3,3);
// Fill matrices
for(i=0;i<n;i++) {
gsl_matrix_set(X,i,0,1.0);
gsl_matrix_set(X,i,1,x[i]);
gsl_matrix_set(X,i,2,y[i]);
gsl_vector_set(yy,i,z[i]);
gsl_vector_set(w,i,1.0);
}
// Do fit
gsl_multifit_linear_workspace *work=gsl_multifit_linear_alloc(n,3);
gsl_multifit_wlinear(X,w,yy,c,cov,&chisq,work);
gsl_multifit_linear_free(work);
// Save parameters
for (i=0;i<3;i++)
a[i]=gsl_vector_get(c,(i));
gsl_matrix_free(X);
gsl_vector_free(yy);
gsl_vector_free(w);
gsl_vector_free(c);
gsl_matrix_free(cov);
return;
}
// Read pixel catalog
struct catalog read_pixel_catalog(char *filename)
{
int i=0;
FILE *file;
char line[LIM];
struct catalog c;
// Read catalog
file=fopen(filename,"r");
if (file==NULL) {
fprintf(stderr,"%s not found!\n",filename);
exit(0);
}
while (fgetline(file,line,LIM)>0) {
if (strstr(line,"#")!=NULL)
continue;
sscanf(line,"%f %f %f",&c.x[i],&c.y[i],&c.mag[i]);
c.select[i]=0;
i++;
}
fclose(file);
c.n=i;
return c;
}
// Greenwich Mean Sidereal Time
double gmst(double mjd)
{
double t,gmst;
t=(mjd-51544.5)/36525.0;
gmst=modulo(280.46061837+360.98564736629*(mjd-51544.5)+t*t*(0.000387933-t/38710000),360.0);
return gmst;
}
// Return x modulo y [0,y)
double modulo(double x,double y)
{
x=fmod(x,y);
if (x<0.0) x+=y;
return x;
}
// Precess a celestial position
void precess(double mjd0,double ra0,double de0,double mjd,double *ra,double *de)
{
double t0,t;
double zeta,z,theta;
double a,b,c;
// Angles in radians
ra0*=D2R;
de0*=D2R;
// Time in centuries
t0=(mjd0-51544.5)/36525.0;
t=(mjd-mjd0)/36525.0;
// Precession angles
zeta=(2306.2181+1.39656*t0-0.000139*t0*t0)*t;
zeta+=(0.30188-0.000344*t0)*t*t+0.017998*t*t*t;
zeta*=D2R/3600.0;
z=(2306.2181+1.39656*t0-0.000139*t0*t0)*t;
z+=(1.09468+0.000066*t0)*t*t+0.018203*t*t*t;
z*=D2R/3600.0;
theta=(2004.3109-0.85330*t0-0.000217*t0*t0)*t;
theta+=-(0.42665+0.000217*t0)*t*t-0.041833*t*t*t;
theta*=D2R/3600.0;
a=cos(de0)*sin(ra0+zeta);
b=cos(theta)*cos(de0)*cos(ra0+zeta)-sin(theta)*sin(de0);
c=sin(theta)*cos(de0)*cos(ra0+zeta)+cos(theta)*sin(de0);
*ra=(atan2(a,b)+z)*R2D;
*de=asin(c)*R2D;
if (*ra<360.0)
*ra+=360.0;
if (*ra>360.0)
*ra-=360.0;
return;
}
// Convert Sexagesimal into Decimal
double s2dec(char *s)
{
double x;
float deg,min,sec;
char t[LIM];
strcpy(t,s);
deg=fabs(atof(strtok(t," :")));
min=fabs(atof(strtok(NULL," :")));
sec=fabs(atof(strtok(NULL," :")));
x=(double) deg+(double) min/60.+(double) sec/3600.;
if (s[0]=='-') x= -x;
return x;
}
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