int main(int argc, char** args) {
char* outfn = NULL;
char* infn = NULL;
int ext;
int c;
int loglvl = LOG_MSG;
qfits_header* hdr;
sip_t sip;
while ((c = getopt(argc, args, OPTIONS)) != -1) {
switch (c) {
case '?':
case 'h':
print_help(args[0]);
exit(0);
case 'v':
loglvl++;
break;
}
}
log_init(loglvl);
if (optind != argc-3) {
print_help(args[0]);
exit(-1);
}
infn = args[optind+0];
ext = atoi(args[optind+1]);
outfn = args[optind+2];
logmsg("Reading extension %i from file \"%s\"\n", ext, infn);
hdr = anqfits_get_header2(infn, ext);
if (!hdr) {
ERROR("Failed to read header from extension %i of file \"%s\"\n", ext, infn);
exit(-1);
}
if (!sip_read_header(hdr, &sip)) {
ERROR("Failed to read SIP header.\n");
exit(-1);
}
if (sip.a_order > 0) {
logmsg("Got SIP header.\n");
} else {
logmsg("Got TAN header.\n");
}
logmsg("Writing to file \"%s\"\n", outfn);
if (sip_write_to_file(&sip, outfn)) {
ERROR("Failed to write SIP header to file \"%s\".\n", outfn);
exit(-1);
}
qfits_header_destroy(hdr);
return 0;
}
int wcs_pv2sip(const char* wcsinfn, int ext,
const char* wcsoutfn,
anbool scamp_head_file,
double* xy, int Nxy,
int imageW, int imageH,
anbool forcetan) {
qfits_header* hdr = NULL;
double* radec = NULL;
int rtn = -1;
tan_t tanwcs;
double x,y, px,py;
double xyz[3];
double* xorig = NULL;
double* yorig = NULL;
double* rddist = NULL;
int i, j;
// 1 x y r x2 xy y2 x3 x2y xy2 y3 r3 x4 x3y x2y2 xy3 y4
// x5 x4y x3y2 x2y3 xy4 y5 r5 x6 x5y x4y2, x3y3 x2y4 xy5 y6
// x7 x6y x5y2 x4y3 x3y4 x2y5 xy6 y7 r7
int xp[] = { 0, 1, 0, 0, 2, 1, 0, 3, 2, 1, 0, 0, 4, 3, 2, 1, 0,
5, 4, 3, 2, 1, 5, 0, 6, 5, 4, 3, 2, 1, 0,
7, 6, 5, 4, 3, 2, 1, 0, 0};
int yp[] = { 0, 0, 1, 0, 0, 1, 2, 0, 1, 2, 3, 0, 0, 1, 2, 3, 4,
0, 1, 2, 3, 4, 0, 0, 0, 1, 2, 3, 4, 5, 6,
0, 1, 2, 3, 4, 5, 6, 7, 0};
int rp[] = { 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 7};
double xpows[8];
double ypows[8];
double rpows[8];
double pv1[40];
double pv2[40];
double r;
if (scamp_head_file) {
size_t sz = 0;
char* txt;
char* prefix;
int np;
int nt;
unsigned char* txthdr;
sl* lines;
int i;
txt = file_get_contents(wcsinfn, &sz, TRUE);
if (!txt) {
ERROR("Failed to read file %s", wcsinfn);
goto bailout;
}
lines = sl_split(NULL, txt, "\n");
prefix =
"SIMPLE = T / Standard FITS file "
"BITPIX = 8 / ASCII or bytes array "
"NAXIS = 0 / Minimal header "
"EXTEND = T / There may be FITS ext "
"WCSAXES = 2 / ";
np = strlen(prefix);
nt = np + FITS_LINESZ * sl_size(lines);
txthdr = malloc(nt);
memset(txthdr, ' ', np + FITS_LINESZ * sl_size(lines));
memcpy(txthdr, prefix, np);
for (i=0; i<sl_size(lines); i++)
memcpy(txthdr + np + i*FITS_LINESZ, sl_get(lines, i), strlen(sl_get(lines, i)));
sl_free2(lines);
hdr = qfits_header_read_hdr_string(txthdr, nt);
free(txthdr);
free(txt);
} else {
char* ct;
hdr = anqfits_get_header2(wcsinfn, ext);
ct = fits_get_dupstring(hdr, "CTYPE1");
if ((ct && streq(ct, "RA---TPV")) || forcetan) {
// http://iraf.noao.edu/projects/ccdmosaic/tpv.html
logmsg("Replacing CTYPE1 = %s header with RA---TAN\n", ct);
fits_update_value(hdr, "CTYPE1", "RA---TAN");
}
ct = fits_get_dupstring(hdr, "CTYPE2");
if ((ct && streq(ct, "DEC--TPV")) || forcetan) {
logmsg("Replacing CTYPE2 = %s header with DEC--TAN\n", ct);
fits_update_value(hdr, "CTYPE2", "DEC--TAN");
}
}
if (!hdr) {
ERROR("Failed to read header: file %s, ext %i\n", wcsinfn, ext);
goto bailout;
}
tan_read_header(hdr, &tanwcs);
for (i=0; i<sizeof(pv1)/sizeof(double); i++) {
char key[10];
sprintf(key, "PV1_%i", i);
pv1[i] = qfits_header_getdouble(hdr, key, 0.0);
sprintf(key, "PV2_%i", i);
pv2[i] = qfits_header_getdouble(hdr, key, 0.0);
}
xorig = malloc(Nxy * sizeof(double));
yorig = malloc(Nxy * sizeof(double));
rddist = malloc(2 * Nxy * sizeof(double));
for (j=0; j<Nxy; j++) {
xorig[j] = xy[2*j+0];
yorig[j] = xy[2*j+1];
tan_pixelxy2iwc(&tanwcs, xorig[j], yorig[j], &x, &y);
r = sqrt(x*x + y*y);
xpows[0] = ypows[0] = rpows[0] = 1.0;
for (i=1; i<sizeof(xpows)/sizeof(double); i++) {
xpows[i] = xpows[i-1]*x;
ypows[i] = ypows[i-1]*y;
rpows[i] = rpows[i-1]*r;
}
px = py = 0;
for (i=0; i<sizeof(xp)/sizeof(int); i++) {
px += pv1[i] * xpows[xp[i]] * ypows[yp[i]] * rpows[rp[i]];
py += pv2[i] * ypows[xp[i]] * xpows[yp[i]] * rpows[rp[i]];
}
tan_iwc2xyzarr(&tanwcs, px, py, xyz);
xyzarr2radecdeg(xyz, rddist+2*j, rddist+2*j+1);
}
//
{
starxy_t sxy;
tweak_t* t;
il* imgi;
il* refi;
int sip_order = 5;
int sip_inv_order = 5;
sxy.N = Nxy;
sxy.x = xorig;
sxy.y = yorig;
imgi = il_new(256);
refi = il_new(256);
for (i=0; i<Nxy; i++) {
il_append(imgi, i);
il_append(refi, i);
}
t = tweak_new();
t->sip->a_order = t->sip->b_order = sip_order;
t->sip->ap_order = t->sip->bp_order = sip_inv_order;
tweak_push_wcs_tan(t, &tanwcs);
tweak_push_ref_ad_array(t, rddist, Nxy);
tweak_push_image_xy(t, &sxy);
tweak_push_correspondence_indices(t, imgi, refi, NULL, NULL);
tweak_go_to(t, TWEAK_HAS_LINEAR_CD);
if (imageW)
t->sip->wcstan.imagew = imageW;
if (imageH)
t->sip->wcstan.imageh = imageH;
sip_write_to_file(t->sip, wcsoutfn);
tweak_free(t);
}
rtn = 0;
bailout:
free(xorig);
free(yorig);
free(rddist);
qfits_header_destroy(hdr);
free(radec);
return rtn;
}
int main(int argc, char** args) {
int c;
char* xylsfn = NULL;
char* rdlsfn = NULL;
char* corrfn = NULL;
char* outfn = NULL;
char* xcol = NULL;
char* ycol = NULL;
char* rcol = NULL;
char* dcol = NULL;
xylist_t* xyls = NULL;
rdlist_t* rdls = NULL;
rd_t rd;
starxy_t xy;
int fieldnum = 1;
int N;
double* fieldxy = NULL;
double* xyz = NULL;
sip_t wcs;
int rtn = -1;
int loglvl = LOG_MSG;
int siporder = 0;
int W=0, H=0;
anbool crpix_center = FALSE;
int i;
int doshift = 1;
fits_use_error_system();
while ((c = getopt(argc, args, OPTIONS)) != -1) {
switch (c) {
case 'h':
print_help(args[0]);
exit(0);
case 'W':
W = atoi(optarg);
break;
case 'H':
H = atoi(optarg);
break;
case 'C':
crpix_center = TRUE;
break;
case 's':
siporder = atoi(optarg);
break;
case 'c':
corrfn = optarg;
break;
case 'r':
rdlsfn = optarg;
break;
case 'R':
rcol = optarg;
break;
case 'D':
dcol = optarg;
break;
case 'x':
xylsfn = optarg;
break;
case 'X':
xcol = optarg;
break;
case 'Y':
ycol = optarg;
break;
case 'o':
outfn = optarg;
break;
case 'v':
loglvl++;
break;
}
}
if (optind != argc) {
print_help(args[0]);
exit(-1);
}
if (! ((xylsfn && rdlsfn) || corrfn) || !outfn) {
print_help(args[0]);
exit(-1);
}
log_init(loglvl);
if (corrfn) {
xylsfn = corrfn;
rdlsfn = corrfn;
if (!xcol)
xcol = "FIELD_X";
if (!ycol)
ycol = "FIELD_Y";
if (!rcol)
rcol = "INDEX_RA";
if (!dcol)
dcol = "INDEX_DEC";
}
// read XYLS.
xyls = xylist_open(xylsfn);
if (!xyls) {
ERROR("Failed to read an xylist from file %s", xylsfn);
goto bailout;
}
xylist_set_include_flux(xyls, FALSE);
xylist_set_include_background(xyls, FALSE);
if (xcol)
xylist_set_xname(xyls, xcol);
if (ycol)
xylist_set_yname(xyls, ycol);
// read RDLS.
rdls = rdlist_open(rdlsfn);
if (!rdls) {
ERROR("Failed to read an RA,Dec list from file %s", rdlsfn);
goto bailout;
}
if (rcol)
rdlist_set_raname(rdls, rcol);
if (dcol)
rdlist_set_decname(rdls, dcol);
if (!xylist_read_field_num(xyls, fieldnum, &xy)) {
ERROR("Failed to read xyls file %s, field %i", xylsfn, fieldnum);
goto bailout;
}
if (!rdlist_read_field_num(rdls, fieldnum, &rd)) {
ERROR("Failed to read rdls field %i", fieldnum);
goto bailout;
}
N = starxy_n(&xy);
if (rd_n(&rd) != N) {
ERROR("X,Y list and RA,Dec list must have the same number of entries, "
"but found %i vs %i", N, rd_n(&rd));
goto bailout;
}
logverb("Read %i points from %s and %s\n", N, rdlsfn, xylsfn);
xyz = (double*)malloc(sizeof(double) * 3 * N);
if (!xyz) {
ERROR("Failed to allocate %i xyz coords", N);
goto bailout;
}
radecdeg2xyzarrmany(rd.ra, rd.dec, xyz, N);
fieldxy = starxy_to_xy_array(&xy, NULL);
if (!fieldxy) {
ERROR("Failed to allocate %i xy coords", N);
goto bailout;
}
logverb("Fitting WCS\n");
if (siporder == 0) {
if (fit_tan_wcs(xyz, fieldxy, N, &(wcs.wcstan), NULL)) {
ERROR("Failed to fit for TAN WCS");
goto bailout;
}
} else {
if (W == 0) {
for (i=0; i<N; i++) {
W = MAX(W, (int)ceil(fieldxy[2*i + 0]));
}
}
if (H == 0) {
for (i=0; i<N; i++) {
H = MAX(H, (int)ceil(fieldxy[2*i + 1]));
}
}
logverb("Image size = %i x %i pix\n", W, H);
fit_sip_wcs_2(xyz, fieldxy, NULL, N,
siporder, siporder+1, W, H,
crpix_center, NULL, doshift, &wcs);
}
if (siporder <= 1) {
if (tan_write_to_file(&(wcs.wcstan), outfn)) {
ERROR("Failed to write TAN WCS header to file \"%s\"", outfn);
goto bailout;
}
} else {
if (sip_write_to_file(&wcs, outfn)) {
ERROR("Failed to write SIP WCS header to file \"%s\"", outfn);
goto bailout;
}
}
logverb("Wrote WCS to %s\n", outfn);
starxy_free_data(&xy);
rd_free_data(&rd);
rtn = 0;
bailout:
if (rdls)
rdlist_close(rdls);
if (xyls)
xylist_close(xyls);
if (fieldxy)
free(fieldxy);
if (xyz)
free(xyz);
return rtn;
}
/**
Evaluates the given TAN-TPV WCS header on a grid of points,
fitting a SIP distortion solution to it.
The grid can be specified by either:
double* xy, int Nxy
double stepsize=100, double xlo=0, double xhi=0, double ylo=0, double yhi=0
xlo and xhi, if both 0, default to 1. and the WCS width
ylo and yhi, if both 0, default to 1. and the WCS height
The number of steps is chosen to be the closest step size to split the range
xlo to xhi into an integer number of steps.
imageW and imageH, if non-zero, override the image width read from the WCS,
and ALSO the WCS width/height mentioned above.
*/
int wcs_pv2sip(const char* wcsinfn, int ext,
const char* wcsoutfn,
anbool scamp_head_file,
double* xy, int Nxy,
double stepsize,
double xlo, double xhi,
double ylo, double yhi,
int imageW, int imageH,
int order,
anbool forcetan,
int doshift) {
qfits_header* hdr = NULL;
sip_t* sip = NULL;
int rtn = -1;
if (scamp_head_file) {
size_t sz = 0;
char* txt;
char* prefix;
int np;
int nt;
unsigned char* txthdr;
sl* lines;
int i;
txt = file_get_contents(wcsinfn, &sz, TRUE);
if (!txt) {
ERROR("Failed to read file %s", wcsinfn);
goto bailout;
}
lines = sl_split(NULL, txt, "\n");
prefix =
"SIMPLE = T / Standard FITS file "
"BITPIX = 8 / ASCII or bytes array "
"NAXIS = 0 / Minimal header "
"EXTEND = T / There may be FITS ext "
"WCSAXES = 2 / ";
np = strlen(prefix);
nt = np + FITS_LINESZ * sl_size(lines);
txthdr = malloc(nt);
memset(txthdr, ' ', np + FITS_LINESZ * sl_size(lines));
memcpy(txthdr, prefix, np);
for (i=0; i<sl_size(lines); i++)
memcpy(txthdr + np + i*FITS_LINESZ, sl_get(lines, i), strlen(sl_get(lines, i)));
sl_free2(lines);
hdr = qfits_header_read_hdr_string(txthdr, nt);
free(txthdr);
free(txt);
} else {
hdr = anqfits_get_header2(wcsinfn, ext);
}
if (!hdr) {
ERROR("Failed to read header: file %s, ext %i\n", wcsinfn, ext);
goto bailout;
}
sip = wcs_pv2sip_header(hdr, xy, Nxy, stepsize, xlo, xhi, ylo, yhi,
imageW, imageH, order, forcetan, doshift);
if (!sip) {
goto bailout;
}
sip_write_to_file(sip, wcsoutfn);
rtn = 0;
bailout:
qfits_header_destroy(hdr);
return rtn;
}