medianEllipticity1ResidualsFromCat

lsst.validate.drp.util.medianEllipticity1ResidualsFromCat(cat)

Compute the median real ellipticty residuals from a catalog of measurements.

Parameters:

cat : collection

Object with .get method for ‘e1’, ‘psf_e1’ that returns radians.

Returns:

e1_median : float

Median imaginary ellipticity residual.