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|
include <error.h>
include <imhdr.h>
include <smw.h>
define DEREDTYPES "|A(V)|E(B-V)|c|"
# T_DEREDDEN -- Apply interstellar extinction correction to spectra.
# The extinction function is taken from Cardelli, Clayton, and Mathis,
# ApJ 345:245. The input parameters are A(V)/E(B-V) and one of A(V),
# E(B-V), or c.
procedure t_deredden ()
pointer inlist # Input list
pointer outlist # Output list
real av # Extinction parameter: A(V), E(B-V), c
real rv # A(V)/E(B-V)
int i, j, n
real w, avold, rvold
pointer sp, input, output, temp, log, aps
pointer in, out, mw, sh, tmp, inbuf, outbuf
long clktime()
real clgetr()
double shdr_lw()
bool clgetb(), streq(), rng_elementi()
int clgwrd(), imtgetim(), imtlen(), imaccf(), nscan(), strncmp(), ctor()
pointer imtopenp(), rng_open(), immap(), smw_openim(), imgl3r(), impl3r()
errchk immap, smw_openim, shdr_open, deredden, deredden1
begin
call smark (sp)
call salloc (input, SZ_FNAME, TY_CHAR)
call salloc (output, SZ_FNAME, TY_CHAR)
call salloc (temp, SZ_LINE, TY_CHAR)
call salloc (log, SZ_LINE, TY_CHAR)
call cnvdate (clktime(0), Memc[log], SZ_LINE)
# Get task parameters.
inlist = imtopenp ("input")
outlist = imtopenp ("output")
call clgstr ("records", Memc[input], SZ_FNAME)
call odr_openp (inlist, Memc[input])
call odr_openp (outlist, Memc[input])
av = clgetr ("value")
rv = clgetr ("R")
# Convert input extinction type to A(V)
switch (clgwrd ("type", Memc[input], SZ_FNAME, DEREDTYPES)) {
case 1:
call sprintf (Memc[log], SZ_LINE, "%s A(V)=%g R=%g")
call pargstr (Memc[log])
call pargr (av)
call pargr (rv)
case 2:
call sprintf (Memc[log], SZ_LINE, "%s E(B-V)=%g A(V)=%g R=%g")
call pargstr (Memc[log])
call pargr (av)
call pargr (rv * av)
call pargr (rv)
av = rv * av
case 3:
call sprintf (Memc[log], SZ_LINE, "%s c=%g A(V)=%g R=%g")
call pargstr (Memc[log])
call pargr (av)
call pargr (rv * av * (0.61 + 0.024 * av))
call pargr (rv)
av = rv * av * (0.61 + 0.024 * av)
}
call clgstr ("apertures", Memc[temp], SZ_LINE)
iferr (aps = rng_open (Memc[temp], INDEF, INDEF, INDEF))
call error (0, "Bad aperture list")
if (Memc[temp] != EOS) {
call sprintf (Memc[log], SZ_LINE, "%s ap=%s")
call pargstr (Memc[log])
call pargstr (Memc[temp])
}
# Loop over all input images.
in = NULL
out = NULL
mw = NULL
sh = NULL
while (imtgetim (inlist, Memc[input], SZ_FNAME) != EOF) {
if (imtlen (outlist) > 0) {
if (imtgetim (outlist, Memc[output], SZ_FNAME) == EOF)
break
} else
call strcpy (Memc[input], Memc[output], SZ_FNAME)
iferr {
# Map the image and check its calibration status.
tmp = immap (Memc[input], READ_ONLY, 0); in = tmp
tmp = smw_openim (in); mw = tmp
call shdr_open (in, mw, 1, 1, INDEFI, SHHDR, sh)
if (DC(sh) == DCNO) {
call sprintf (Memc[temp], SZ_LINE,
"[%s] has no dispersion function")
call pargstr (Memc[input])
call error (1, Memc[temp])
}
call shdr_units (sh, "angstroms")
rvold = rv
avold = 0.
if (imaccf (in, "DEREDDEN") == YES) {
if (!clgetb ("override")) {
call sprintf (Memc[temp], SZ_LINE,
"[%s] has already been corrected")
call pargstr (Memc[input])
call error (1, Memc[temp])
} else {
if (clgetb ("uncorrect")) {
call imgstr (in, "DEREDDEN", Memc[temp], SZ_LINE)
call sscan (Memc[temp])
for (i=1;; i=i+1) {
call gargwrd (Memc[temp], SZ_LINE)
if (nscan() < i)
break
if (strncmp (Memc[temp], "A(V)=", 5) == 0) {
j = 6
j = ctor (Memc[temp], j, avold)
} else if (strncmp (Memc[temp], "R=", 2) == 0) {
j = 3
j = ctor (Memc[temp], j, rvold)
}
}
}
}
}
# Map the output image.
if (streq (Memc[input], Memc[output]))
call mktemp ("temp", Memc[temp], SZ_LINE)
else
call strcpy (Memc[output], Memc[temp], SZ_LINE)
tmp = immap (Memc[temp], NEW_COPY, in); out = tmp
if (IM_PIXTYPE(out) != TY_DOUBLE)
IM_PIXTYPE(out) = TY_REAL
call imastr (out, "DEREDDEN", Memc[log])
# Initialize for NDSPEC data.
if (SMW_FORMAT(mw) == SMW_ND) {
if (SX(sh) == NULL)
call malloc (SX(sh), SN(sh), TY_REAL)
else
call realloc (SX(sh), SN(sh), TY_REAL)
do i = 1, SN(sh)
Memr[SX(sh)+i-1] = shdr_lw (sh, double(i))
}
# Log operation.
call printf ("[%s]: %s\n %s\n")
call pargstr (Memc[output])
call pargstr (IM_TITLE(in))
call pargstr (Memc[log])
# Deredden data.
n = IM_LEN(in,1)
do j = 1, IM_LEN(in,3) {
do i = 1, IM_LEN(in,2) {
outbuf = impl3r (out, i, j)
switch (SMW_FORMAT(mw)) {
case SMW_ND:
inbuf = imgl3r (in, i, j)
switch (SMW_LAXIS(mw,1)) {
case 1:
call deredden (Memr[SX(sh)], Memr[inbuf],
Memr[outbuf], SN(sh), av, rv, avold, rvold)
case 2:
w = Memr[SX(sh)+i-1]
call deredden1 (w, Memr[inbuf], Memr[outbuf],
n, av, rv, avold, rvold)
case 3:
w = Memr[SX(sh)+j-1]
call deredden1 (w, Memr[inbuf], Memr[outbuf],
n, av, rv, avold, rvold)
}
case SMW_ES, SMW_MS:
call shdr_open (in, mw, i, j, INDEFI, SHDATA, sh)
if (rng_elementi (aps, AP(sh))) {
if (j==1) {
call printf (" Ap %d: %s\n")
call pargi (AP(sh))
call pargstr (TITLE(sh))
}
call deredden (Memr[SX(sh)], Memr[SY(sh)],
Memr[outbuf], SN(sh), av, rv, avold, rvold)
} else
call amovr (Memr[SY(sh)], Memr[outbuf], SN(sh))
if (IM_LEN(out,1) > SN(sh))
call amovkr (Memr[SY(sh)+SN(sh)-1],
Memr[outbuf+SN(sh)], IM_LEN(out,1)-SN(sh))
}
}
}
} then {
call erract (EA_WARN)
if (out != NULL) {
call imunmap (out)
call imdelete (Memc[temp])
}
}
if (mw != NULL) {
if (MW(sh) == mw)
call smw_close (MW(sh))
else
call smw_close (mw)
}
if (out != NULL) {
call imunmap (out)
call imunmap (in)
if (streq (Memc[input], Memc[output])) {
call imdelete (Memc[input])
call imrename (Memc[temp], Memc[output])
}
} else if (in != NULL)
call imunmap (in)
}
call shdr_close (sh)
call rng_close (aps)
call imtclose (inlist)
call imtclose (outlist)
call sfree (sp)
end
# DEREDDEN -- Deredden spectrum
procedure deredden (x, y, z, n, av, rv, avold, rvold)
real x[n] # Wavelengths
real y[n] # Input fluxes
real z[n] # Output fluxes
int n # Number of points
real av, avold # A(V)
real rv, rvold # A(V)/E(B-V)
int i
real cor, ccm()
errchk ccm
begin
if (avold != 0.) {
if (rv != rvold) {
do i = 1, n {
cor = 10. ** (0.4 *
(av * ccm (x[i], rv) - avold * ccm (x[i], rvold)))
z[i] = y[i] * cor
}
} else {
do i = 1, n {
cor = 10. ** (0.4 * (av - avold) * ccm (x[i], rv))
z[i] = y[i] * cor
}
}
} else {
do i = 1, n {
cor = 10. ** (0.4 * av * ccm (x[i], rv))
z[i] = y[i] * cor
}
}
end
# DEREDDEN1 -- Deredden fluxes at a single wavelength
procedure deredden1 (x, y, z, n, av, rv, avold, rvold)
real x # Wavelength
real y[n] # Input fluxes
real z[n] # Output fluxes
int n # Number of points
real av, avold # A(V)
real rv, rvold # A(V)/E(B-V)
int i
real cor, ccm()
errchk ccm
begin
if (avold != 0.) {
if (rv != rvold)
cor = 10. ** (0.4 *
(av * ccm (x, rv) - avold * ccm (x, rvold)))
else
cor = 10. ** (0.4 * (av - avold) * ccm (x, rv))
} else
cor = 10. ** (0.4 * av * ccm (x, rv))
do i = 1, n
z[i] = y[i] * cor
end
# CCM -- Compute CCM Extinction Law
real procedure ccm (wavelength, rv)
real wavelength # Wavelength in Angstroms
real rv # A(V) / E(B-V)
real x, y, a, b
begin
# Convert to inverse microns
x = 10000. / wavelength
# Compute a(x) and b(x)
if (x < 0.3) {
call error (1, "Wavelength out of range of extinction function")
} else if (x < 1.1) {
y = x ** 1.61
a = 0.574 * y
b = -0.527 * y
} else if (x < 3.3) {
y = x - 1.82
a = 1 + y * (0.17699 + y * (-0.50447 + y * (-0.02427 +
y * (0.72085 + y * (0.01979 + y * (-0.77530 + y * 0.32999))))))
b = y * (1.41338 + y * (2.28305 + y * (1.07233 + y * (-5.38434 +
y * (-0.62251 + y * (5.30260 + y * (-2.09002)))))))
} else if (x < 5.9) {
y = (x - 4.67) ** 2
a = 1.752 - 0.316 * x - 0.104 / (y + 0.341)
y = (x - 4.62) ** 2
b = -3.090 + 1.825 * x + 1.206 / (y + 0.263)
} else if (x < 8.0) {
y = (x - 4.67) ** 2
a = 1.752 - 0.316 * x - 0.104 / (y + 0.341)
y = (x - 4.62) ** 2
b = -3.090 + 1.825 * x + 1.206 / (y + 0.263)
y = x - 5.9
a = a - 0.04473 * y**2 - 0.009779 * y**3
b = b + 0.2130 * y**2 + 0.1207 * y**3
} else if (x <= 10.0) {
y = x - 8
a = -1.072 - 0.628 * y + 0.137 * y**2 - 0.070 * y**3
b = 13.670 + 4.257 * y - 0.420 * y**2 + 0.374 * y**3
} else {
call error (1, "Wavelength out of range of extinction function")
}
# Compute A(lambda)/A(V)
y = a + b / rv
return (y)
end
|
