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include <imhdr.h>
include "../lib/apphot.h"
# AP_AIRMASS - Procedure to determine the image airmass.
procedure ap_airmass (im, ap)
pointer im # pointer to IRAF image
pointer ap # pointer to apphot structure
pointer sp, key
real xair
real imgetr(), apstatr()
begin
call smark (sp)
call salloc (key, SZ_FNAME, TY_CHAR)
call apstats (ap, AIRMASS, Memc[key], SZ_FNAME)
if (Memc[key] == EOS)
xair = apstatr (ap, XAIRMASS)
else {
iferr {
xair = imgetr (im, Memc[key])
} then {
xair = apstatr (ap, XAIRMASS)
call eprintf ("Warning: Image %s Keyword: %s not found\n")
call pargstr (IM_HDRFILE(im))
call pargstr (Memc[key])
}
}
if (IS_INDEFR(xair) || xair <= 0.0)
call apsetr (ap, XAIRMASS, INDEFR)
else
call apsetr (ap, XAIRMASS, xair)
call sfree (sp)
end
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