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include <fset.h>
include <imhdr.h>
include <mwset.h>
include <pkg/skywcs.h>
include "../../lib/astrom.h"
include "../../lib/acatalog.h"
# AT_RCLIST -- Create a list of field centers.
int procedure at_rclist (at, rcsource)
pointer at #I the astrometry descriptor
char rcsource[ARB] #I the source of the regions list
pointer sp, symname, st, sym
int nfields, fd, imlist
double at_statd()
pointer at_statp(), stopen(), stenter()
int at_stati(), access(), open(), imtopen(), at_rcread(), at_rcwcsim()
bool streq()
begin
# Store the rcsource name in the data structure.
call at_sets (at, RCSOURCE, rcsource)
# Check that the field center pointer is defined.
if (at_statp (at, PRCENTER) == NULL)
return (0)
call smark (sp)
call salloc (symname, SZ_FNAME, TY_CHAR)
# Open the symbol table.
if (at_statp (at, RCST) != NULL)
call stclose (at_statp(at, RCST))
st = stopen ("fclist", 2 * DEF_LEN_RCST, DEF_LEN_RCST,
10 * DEF_LEN_RCST)
call at_setp (at, RCST, st)
# The source is the fcpars parameter set.
if (streq (rcsource, "pars")) {
if (at_statd (at, RCRA) < 0.0d0 || at_statd(at, RCRA) > 360.0d0)
nfields = 0
else if (at_statd (at, RCDEC) < -90.0d0 || at_statd(at, RCDEC) >
90.0d0)
nfields = 0
else if (at_statd (at, RCRAWIDTH) / 60.0d0 <= 0.0d0 ||
at_statd(at, RCRAWIDTH) / 60.0d0 > 360.0d0)
nfields = 0
else if (at_statd (at, RCDECWIDTH) / 60.0d0 <= 0.0d0 ||
at_statd(at, RCDECWIDTH) / 60.0d0 > 180.0d0)
nfields = 0
else {
call sprintf (Memc[symname], SZ_FNAME, "%s1")
call pargstr (DEF_RCST_ROOTNAME)
sym = stenter (st, Memc[symname], LEN_RCST_STRUCT)
AT_RCSTRA(sym) = at_statd (at, RCRA)
AT_RCSTDEC(sym) = at_statd (at, RCDEC)
AT_RCSTRAWIDTH(sym) = at_statd (at, RCRAWIDTH)
AT_RCSTDECWIDTH(sym) = at_statd (at, RCDECWIDTH)
AT_RCSTRAUNITS(sym) = at_stati (at, RCRAUNITS)
AT_RCSTDECUNITS(sym) = at_stati (at, RCDECUNITS)
call at_stats (at, RCSYSTEM, Memc[symname], SZ_FNAME)
call strcpy (Memc[symname], AT_RCSTSYSTEM(sym), SZ_FNAME)
call strcpy ("pars", AT_RCSTSOURCE(sym), SZ_FNAME)
call strcpy ("", AT_RCSTNAME(sym), SZ_FNAME)
nfields = 1
}
# The source is a text file.
} else if (access (rcsource, READ_ONLY, TEXT_FILE) == YES) {
fd = open (rcsource, READ_ONLY, TEXT_FILE)
nfields = at_rcread (fd, at, st)
call close (fd)
# The field center source is a list of images. Assume for now that
# images with celestial coordinate systems have a wcs system name
# of "image". This is true of images with a standard FITS wcs and
# for images with a wcs created by the core IRAF tasks.
} else {
imlist = imtopen (rcsource)
nfields = at_rcwcsim (imlist, at, st)
call imtclose (imlist)
}
call sfree (sp)
return (nfields)
end
# AT_RCREAD -- Read in the field center information from a text file.
int procedure at_rcread (fd, at, st)
int fd #I the field center file descriptor
pointer at #I the astrometry descriptor
pointer st #I the field center symbol table descriptor.
double ra, dec, rawidth, decwidth
pointer sp, symname, sym
int nfields
pointer stenter()
int fscan(), nscan(), at_stati(), strdic()
begin
call smark (sp)
call salloc (symname, SZ_FNAME, TY_CHAR)
nfields = 0
while (fscan(fd) != EOF) {
# Get the minimum number of fields.
call gargd (ra)
call gargd (dec)
call gargd (rawidth)
call gargd (decwidth)
if (nscan() < 4)
next
if (ra < 0.0d0 || ra > 360.0d0)
next
if (dec < -90.0d0 || dec > 90.0d0)
next
if (rawidth / 60.0d0 <= 0.0d0 || rawidth / 60.0d0 > 360.0d0)
next
if (decwidth / 60.0d0 <= 0.0d0 || decwidth / 60.0d0 > 180.0d0)
next
# Get the next symbols.
nfields = nfields + 1
call sprintf (Memc[symname], SZ_FNAME, "%s%d")
call pargstr (DEF_RCST_ROOTNAME)
call pargi (nfields)
sym = stenter (st, Memc[symname], LEN_RCST_STRUCT)
AT_RCSTRA(sym) = ra
AT_RCSTDEC(sym) = dec
AT_RCSTRAWIDTH(sym) = rawidth
AT_RCSTDECWIDTH(sym) = decwidth
# Set the source and source name.
call strcpy ("file", AT_RCSTSOURCE(sym), SZ_FNAME)
call fstats (fd, F_FILENAME, Memc[symname], SZ_FNAME)
call strcpy (Memc[symname], AT_RCSTNAME(sym), SZ_FNAME)
# Decode the units.
call gargwrd (Memc[symname], SZ_FNAME)
if (nscan() < 5) {
AT_RCSTRAUNITS(sym) = at_stati (at, RCRAUNITS)
AT_RCSTDECUNITS(sym) = at_stati (at, RCDECUNITS)
call at_stats (at, RCSYSTEM, Memc[symname], SZ_FNAME)
call strcpy (Memc[symname], AT_RCSTSYSTEM(sym), SZ_FNAME)
next
} else
AT_RCSTRAUNITS(sym) = strdic (Memc[symname], Memc[symname],
SZ_FNAME, AT_RA_UNITS)
call gargwrd (Memc[symname], SZ_FNAME)
if (nscan() < 6) {
AT_RCSTDECUNITS(sym) = at_stati (at, RCDECUNITS)
call at_stats (at, RCSYSTEM, Memc[symname], SZ_FNAME)
call strcpy (Memc[symname], AT_RCSTSYSTEM(sym), SZ_FNAME)
next
} else
AT_RCSTDECUNITS(sym) = strdic (Memc[symname], Memc[symname],
SZ_FNAME, AT_DEC_UNITS)
# Decode the coordinate system.
call gargstr (Memc[symname], SZ_FNAME)
if (Memc[symname] == EOS || nscan() < 7) {
call at_stats (at, RCSYSTEM, Memc[symname], SZ_FNAME)
call strcpy (Memc[symname], AT_RCSTSYSTEM(sym), SZ_FNAME)
} else
call strcpy (Memc[symname], AT_RCSTSYSTEM(sym), SZ_FNAME)
}
call sfree (sp)
return (nfields)
end
# AT_RCWCSIM -- Read in the field center information from a list of images.
int procedure at_rcwcsim (imlist, at, st)
int imlist #I the image list descriptor
pointer at #I the astrometry descriptor
pointer st #I the field center symbol table descriptor.
double ra, dec, width
pointer sp, image, symname, im, mw, coo, sym, ct
int nfields
pointer immap(), mw_sctran(), stenter()
int imtgetim(), sk_decim(), sk_stati()
begin
call smark (sp)
call salloc (image, SZ_FNAME, TY_CHAR)
call salloc (symname, SZ_FNAME, TY_CHAR)
nfields = 0
while (imtgetim (imlist, Memc[image], SZ_FNAME) != EOF) {
# The image must be 2D.
im = immap (Memc[image], READ_ONLY, 0)
if (IM_NDIM(im) != 2) {
call imunmap (im)
next
}
# The image must have a FITS celestial coordinate system.
if (sk_decim (im, "world", mw, coo) == ERR) {
if (mw != NULL)
call mw_close (mw)
call sk_close (coo)
call imunmap (im)
next
}
# Find the center of the image.
ct = mw_sctran (mw, "logical", "world", 03B)
call mw_c2trand (ct, double((1.0d0 + IM_LEN(im,1)) / 2.0d0),
double((1.0d0 + IM_LEN(im,2)) / 2.0d0), ra, dec)
if (ra < 0.0d0 || ra > 360.0d0)
next
if (dec < -90.0d0 || dec > 90.0d0)
next
# Find the width of the field.
call at_gfwidth (im, mw, sk_stati(coo, S_PLNGAX),
sk_stati(coo, S_PLATAX), width)
# Get the next symol.
nfields = nfields + 1
call sprintf (Memc[symname], SZ_FNAME, "%s%d")
call pargstr (DEF_RCST_ROOTNAME)
call pargi (nfields)
sym = stenter (st, Memc[symname], LEN_RCST_STRUCT)
AT_RCSTRA(sym) = ra
AT_RCSTDEC(sym) = dec
AT_RCSTRAWIDTH(sym) = width
AT_RCSTDECWIDTH(sym) = width
AT_RCSTRAUNITS(sym) = AT_DEGREES
AT_RCSTDECUNITS(sym) = AT_DEGREES
call sk_enwcs (coo, AT_RCSTSYSTEM(sym), SZ_FNAME)
call strcpy ("image", AT_RCSTSOURCE(sym), SZ_FNAME)
call strcpy (Memc[image], AT_RCSTNAME(sym), SZ_FNAME)
# Cleanup.
call sk_close (coo)
call mw_close (mw)
call imunmap (im)
}
call sfree (sp)
return (nfields)
end
define NEWCD Memd[ncd+(($2)-1)*ndim+($1)-1]
# AT_GFWIDTH -- Estimate the field width in arcminutes from the size of the
# image and the image wcs.
procedure at_gfwidth (im, mw, lngax, latax, width)
pointer im #I the input image desciptor
pointer mw #I the input wcs descriptor
int lngax #I the longitude axis
int latax #I the latitude axis
double width #O the output field width in minutes of arc
double scale
pointer r, cd, ltm, iltm, ncd
int ndim
int mw_stati()
begin
# Get the dimension of the wcs.
ndim = mw_stati (mw, MW_NPHYSDIM)
# Allocate working memory.
call malloc (r, ndim * ndim, TY_DOUBLE)
call malloc (cd, ndim * ndim, TY_DOUBLE)
call malloc (ltm, ndim * ndim, TY_DOUBLE)
call malloc (iltm, ndim * ndim, TY_DOUBLE)
call malloc (ncd, ndim * ndim, TY_DOUBLE)
# Compute the original world to logical transformation.
call mw_gwtermd (mw, Memd[r], Memd[r], Memd[cd], ndim)
call mw_gltermd (mw, Memd[ltm], Memd[r], ndim)
call mwinvertd (Memd[ltm], Memd[iltm], ndim)
call mwmmuld (Memd[cd], Memd[iltm], Memd[ncd], ndim)
# Estimate the scale.
scale = max (sqrt (NEWCD(lngax,lngax)**2 + NEWCD(lngax,latax)**2),
sqrt (NEWCD(latax,lngax)**2 + NEWCD(latax,latax)**2))
# Compute the width
width = 60.0d0 * scale * max (IM_LEN(im,1), IM_LEN(im,2))
# Free the space.
call mfree (r, TY_DOUBLE)
call mfree (cd, TY_DOUBLE)
call mfree (ncd, TY_DOUBLE)
call mfree (ltm, TY_DOUBLE)
call mfree (iltm, TY_DOUBLE)
end
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