scopesim.optics.image_plane_utils.calc_footprint

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scopesim.optics.image_plane_utils.calc_footprint#

scopesim.optics.image_plane_utils.calc_footprint(header, wcs_suffix='', new_unit: str = None)#

Return the sky/detector positions [deg/mm] of the corners of a header WCS.

TODO: The rest of this docstring is outdated, please update!

The positions returned correspond to the corners of the header’s image array, in this order:

(ra, dec) = (0,0), (w, 0), (w, h), (0, h)
(x, y) = (0,0), (w, 0), (w, h), (0, h)

where w, h are equal to NAXIS1 and NAXIS2 from the header.

Parameters:

  • header (fits.Header)

  • wcs_suffix (str) – Letter suffix for the WCS keywords, e.g. CDELT1D for image-plane coords

Returns:

x, y – [deg or mm] x are the coordinates for pixels [0, w, w, 0] [deg or mm] y are the coordinates for pixels [0, 0, h, h]

Return type:

arrays of floats

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