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include <imhdr.h>
include <ctype.h>
include <error.h>
# SETAIRMASS -- Compute the airmass for a series of images and optionally
# store these in the image header.
# The exposure time is assumed to be in seconds. There is no provision
# for observatories that save the begin and end integration times in
# the header but not the exposure duration. Note that shutter closings
# (due to clouds) void the assumptions about effective airmass.
# Possible keyword input and output time stamps
define AIR_TYPES "|beginning|middle|end|effective|"
define BEGINNING 1
define MIDDLE 2
define END 3
define EFFECTIVE 4
define UT_DEF 0D0 # for precession if the keyword is missing
define SOLTOSID (($1)*1.00273790935d0)
# T_SETAIRMASS -- Read the parameters, loop over the images using Stetson's
# rule, print out answers and update the header
procedure t_setairmass()
pointer imlist, im, obs
pointer sp, input, observatory, date_key, exp_key, air_key, utm_key, ut_hms
pointer ra_key, dec_key, eqn_key, st_key, ut_key, datestr
int intype, outtype, year, month, day, day1, fmt
bool show, update, override, newobs, obshead
double dec, latitude, exptime, scale, jd
double ha, ha_beg, ha_mid, ha_end, ut, ut_mid
double airm_beg, airm_end, airm_mid, airm_eff
bool clgetb()
int imtgetim(), clgwrd(), imaccf(), dtm_encode()
pointer imtopenp(), immap()
double clgetd(), airmassx(), obsgetd(), ast_date_to_julday()
errchk obsobpen, obsgetd, sa_rheader, airmassx, obsimopen
begin
call smark (sp)
call salloc (input, SZ_FNAME, TY_CHAR)
call salloc (observatory, SZ_FNAME, TY_CHAR)
call salloc (ra_key, SZ_FNAME, TY_CHAR)
call salloc (dec_key, SZ_FNAME, TY_CHAR)
call salloc (eqn_key, SZ_FNAME, TY_CHAR)
call salloc (st_key, SZ_FNAME, TY_CHAR)
call salloc (ut_key, SZ_FNAME, TY_CHAR)
call salloc (date_key, SZ_FNAME, TY_CHAR)
call salloc (exp_key, SZ_FNAME, TY_CHAR)
call salloc (air_key, SZ_FNAME, TY_CHAR)
call salloc (utm_key, SZ_FNAME, TY_CHAR)
call salloc (ut_hms, SZ_FNAME, TY_CHAR)
call salloc (datestr, SZ_FNAME, TY_CHAR)
# Get the parameters
imlist = imtopenp ("images")
intype = clgwrd ("intype", Memc[input], SZ_FNAME, AIR_TYPES)
call clgstr ("observatory", Memc[observatory], SZ_FNAME)
call clgstr ("ra", Memc[ra_key], SZ_FNAME)
call clgstr ("dec", Memc[dec_key], SZ_FNAME)
call clgstr ("equinox", Memc[eqn_key], SZ_FNAME)
call clgstr ("st", Memc[st_key], SZ_FNAME)
call clgstr ("ut", Memc[ut_key], SZ_FNAME)
call clgstr ("date", Memc[date_key], SZ_FNAME)
call clgstr ("exposure", Memc[exp_key], SZ_FNAME)
call clgstr ("airmass", Memc[air_key], SZ_FNAME)
call clgstr ("utmiddle", Memc[utm_key], SZ_FNAME)
scale = clgetd ("scale")
# just to be neat
call strupr (Memc[date_key])
call strupr (Memc[exp_key])
call strupr (Memc[air_key])
call strupr (Memc[utm_key])
show = clgetb ("show")
update = clgetb ("update")
# Open observatory later.
obs = NULL
if (update) {
outtype = clgwrd ("outtype", Memc[input], SZ_FNAME, AIR_TYPES)
override = clgetb ("override")
}
# Print a header line (the # should imply a comment to another task)
if (show) {
call printf ("# Image UT middle ")
call printf ("effective begin middle end updated\n")
} else if (!update)
call eprintf ("WARNING: Image headers are not updated\n")
# Loop over all images
while (imtgetim (imlist, Memc[input], SZ_FNAME) != EOF) {
iferr {
if (update)
im = immap (Memc[input], READ_WRITE, 0)
else
im = immap (Memc[input], READ_ONLY, 0)
} then {
call erract (EA_WARN)
next
}
iferr {
call sa_rheader (im, Memc[ra_key], Memc[dec_key],
Memc[eqn_key], Memc[st_key], Memc[ut_key], Memc[date_key],
Memc[exp_key], ha, dec, year, month, day, ut, exptime,
fmt)
# Calculate the mid-UT and HA's for the various input types
switch (intype) {
case BEGINNING:
ha_beg = ha
ha_mid = ha + SOLTOSID(exptime) / 2.
ha_end = ha + SOLTOSID(exptime)
if (IS_INDEFD(ut))
ut_mid = INDEFD
else
ut_mid = ut + exptime / 2.
case MIDDLE:
ha_beg = ha - SOLTOSID(exptime) / 2.
ha_mid = ha
ha_end = ha + SOLTOSID(exptime) / 2.
if (IS_INDEFD(ut))
ut_mid = INDEFD
else
ut_mid = ut
case END:
ha_beg = ha - SOLTOSID(exptime)
ha_mid = ha - SOLTOSID(exptime) / 2.
ha_end = ha
if (IS_INDEFD(ut))
ut_mid = INDEFD
else
ut_mid = ut - exptime / 2.
default:
call error (1, "Bad switch in t_setairmass")
}
# Adjust for possible change of date in ut_mid.
day1 = day
jd = ast_date_to_julday (year, month, day, ut_mid)
call ast_julday_to_date (jd, year, month, day, ut_mid)
# Save the mid-UT as a sexigesimal string for output
call sprintf (Memc[ut_hms], SZ_FNAME, "%h")
call pargd (ut_mid)
# Compute the beginning, middle and ending airmasses
# First get the latitude from the observatory database.
call obsimopen (obs, im, Memc[observatory], NO, newobs, obshead)
if (newobs)
call obslog (obs, "SETAIRMASS", "latitude", STDOUT)
latitude = obsgetd (obs, "latitude")
airm_beg = airmassx (ha_beg, dec, latitude, scale)
airm_mid = airmassx (ha_mid, dec, latitude, scale)
airm_end = airmassx (ha_end, dec, latitude, scale)
# Combine as suggested by P. Stetson (Simpson's rule)
airm_eff = (airm_beg + 4.*airm_mid + airm_end) / 6.
} then {
call erract (EA_WARN)
call imunmap (im)
next
}
if (show) {
call printf ("%20s %11s %7.4f %7.4f %7.4f %7.4f %b\n")
call pargstr (Memc[input])
call pargstr (Memc[ut_hms])
call pargd (airm_eff)
call pargd (airm_beg)
call pargd (airm_mid)
call pargd (airm_end)
call pargb (update)
call flush (STDOUT)
}
if (update) {
if (imaccf (im, Memc[air_key]) == NO || override)
switch (outtype) {
case BEGINNING:
call imaddr (im, Memc[air_key], real(airm_beg))
case MIDDLE:
call imaddr (im, Memc[air_key], real(airm_mid))
case END:
call imaddr (im, Memc[air_key], real(airm_end))
case EFFECTIVE:
call imaddr (im, Memc[air_key], real(airm_eff))
default:
call error (1, "Bad switch in t_setairmass")
}
# Should probably update a date keyword as well
if ((imaccf (im, Memc[utm_key]) == NO || override) &&
(! IS_INDEFD(ut_mid))) {
# if (fmt == NO && day == day1)
# call imastr (im, Memc[utm_key], Memc[ut_hms])
# else if (dtm_encode (Memc[datestr], SZ_FNAME,
# year, month, day, utmid, 2, 0) > 0)
# call imastr (im, Memc[utm_key], Memc[datestr])
if (dtm_encode (Memc[datestr], SZ_FNAME,
year, month, day, utmid, 2, 0) > 0)
call imastr (im, Memc[utm_key], Memc[datestr])
}
}
call imunmap (im)
}
call obsclose (obs)
call sfree (sp)
end
# SA_RHEADER -- derive the ha, dec, ut, and exptime from the header.
define SZ_TOKEN 2
procedure sa_rheader (im, ra_key, dec_key, eqn_key, st_key, ut_key, dkey, ekey,
ha, dec, year, month, day, ut, exptime, fmt)
pointer im #I imio pointer
char ra_key[ARB] #I date keyword (hh.hhh or hh:mm:ss.s)
char dec_key[ARB] #I date keyword (dd.ddd or dd:mm:ss.s)
char eqn_key[ARB] #I date keyword (yyyy.yyy)
char st_key[ARB] #I date keyword (hh.hhh or hh:mm:ss.s)
char ut_key[ARB] #I date keyword (hh.hhh or hh:mm:ss.s)
char dkey[ARB] #I date keyword (YYYY-MM-DDTHH:MM:SS.S or DD/MM/YY)
char ekey[ARB] #I exposure keyword (seconds)
double ha #O hour angle
double dec #O current epoch declination
int year #O year
int month #O month
int day #O day
double ut #O universal time
double exptime #O exposure time (hours)
int fmt #O Date format?
pointer date, sp
double ra1, dec1, epoch1, ra2, dec2, epoch2, st2, ut2
int ip, flags
double imgetd()
int dtm_decode(), strmatch()
bool fp_equald()
errchk imgetd, imgstr
begin
call smark (sp)
call salloc (date, SZ_LINE, TY_CHAR)
iferr {
# `1' is the coordinate epoch, `2' is the observation epoch
ra1 = imgetd (im, ra_key)
ip = strmatch (ra_key, "^{CRVAL}")
if (ip > 0) {
if (IS_DIGIT(ra_key[ip]) && TO_INTEG(ra_key[ip] > 0))
ra1 = ra1 / 15.0d0
}
dec1 = imgetd (im, dec_key)
st2 = imgetd (im, st_key)
# Parse UT keyword in either hours or date.
fmt = YES
call imgstr (im, ut_key, Memc[date], SZ_LINE)
if (dtm_decode (Memc[date],year,month,day,ut,flags) == ERR) {
iferr (ut = imgetd (im, ut_key))
call error (1, "Error in ut keyword")
fmt = NO
}
# Parse the date.
call imgstr (im, dkey, Memc[date], SZ_LINE)
if (dtm_decode (Memc[date],year,month,day,ut2,flags) == ERR)
call error (1, "Error in date keyword")
iferr (epoch1 = imgetd (im, eqn_key))
epoch1 = INDEFD
if (!(fp_equald (epoch1, double(0.)) || IS_INDEFD(epoch1))) {
if (IS_INDEFD(ut))
call ast_date_to_epoch (year, month, day, UT_DEF, epoch2)
else
call ast_date_to_epoch (year, month, day, ut, epoch2)
call astprecess (ra1, dec1, epoch1, ra2, dec2, epoch2)
} else {
ra2 = ra1
dec2 = dec1
call eprintf ("\tCoords not precessed for %s: check %s\n")
call pargstr (IM_HDRFILE(im))
call pargstr (eqn_key)
call flush (STDERR)
}
# don't use the output arguments internally
ha = st2 - ra2
dec = dec2
exptime = imgetd (im, ekey) / 3600.d0
} then {
call sfree (sp)
call eprintf ("Problem reading header for %s:\n")
call pargstr (IM_HDRFILE(im))
call flush (STDERR)
call erract (EA_ERROR)
}
call sfree (sp)
end
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