webbpsf_ext.utils.pix_ang_size

webbpsf_ext.utils.pix_ang_size(ap=None, sr=True, pixscale=None)[source]

Angular area of pixel from aperture object

If sr=True then return in sterradians, otherwise return in units of arcsec^2.

Parameters:

ap (pysiaf.Aperture) – Aperture object
sr (bool) – Return in steradians? Default True.
pixscale (float, array-like, or None) – Pixel scale in arcsec/pixel. If None, then use ap.XSciScale and ap.YSciScale to determine pixel scale. If pixscale is array-like, then assume (xscale, yscale).