def compute_field_coord(header):
"""Compute galactocentric radius for this ACS field as well as the
central RA, Dec.
"""
wcs = WCS(header)
footprint = wcs.calcFootprint()
ra0 = np.array([v[0] for v in footprint]).mean()
dec0 = np.array([v[1] for v in footprint]).mean()
coord = ICRS(ra=ra0, dec=dec0, unit=(u.degree, u.degree))
return ra0, dec0, correct_rgc(coord)
def make_polygon(header):
"""Get footprint polygons, with (RA,Dec) vertices, from the given
extensions in the in the reference FITS file.
"""
wcs = WCS(header)
return wcs.calcFootprint().tolist()
def make_polygon(header):
"""Get footprint polygons, with (RA,Dec) vertices, from the given
extensions in the in the reference FITS file.
"""
wcs = WCS(header)
return wcs.calcFootprint().tolist()
