diff options
Diffstat (limited to 'astro/calc_psd.py')
| -rwxr-xr-x | astro/calc_psd.py | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/astro/calc_psd.py b/astro/calc_psd.py index 018c52a..a18e755 100755 --- a/astro/calc_psd.py +++ b/astro/calc_psd.py @@ -249,6 +249,9 @@ def main(): "at every frequency point will be calculated, " + "i.e., using a even grid, which may be very slow " + "for very large images!") + parser.add_argument("-p", "--pixelsize", dest="pixelsize", type=float, + help="image spatial pixel size [arcsec] " + + "(will try to obtain from FITS header)") parser.add_argument("-P", "--plot", dest="plot", action="store_true", help="plot the PSD and save as a PNG image") parser.add_argument("-i", "--infile", dest="infile", nargs="+", @@ -271,8 +274,21 @@ def main(): header, image = open_image(args.infile[0]) bunit = header.get("BUNIT", "???") print("Read image from: %s" % args.infile[0]) + print("Image size: %dx%d" % tuple(reversed(image.shape))) print("Data unit: %s" % bunit) + if args.pixelsize: + pixel = (args.pixelsize/60, "arcmin") # [arcsec]->[arcmin] + else: + try: + pixel = (header["PixSize"]/60, "arcmin") # [arcsec]->[arcmin] + except KeyError: + try: + pixel = (abs(header["CDELT1"])*60, "arcmin") # [deg]->[arcmin] + except KeyError: + pixel = (1.0, "pixel") + print("Image pixel size: %.2f [%s]" % pixel) + for fn in args.infile[1:]: print("Adding additional image: %s" % fn) header2, image2 = open_image(fn) @@ -282,7 +298,7 @@ def main(): else: raise ValueError("image has different unit: %s" % bunit2) - psdobj = PSD(image=image, step=args.step) + psdobj = PSD(image=image, pixel=pixel, step=args.step) freqs, psd, psd_err = psdobj.calc_psd() # Write out PSD results |