tweak_align

grizli.prep.tweak_align(direct_group={}, grism_group={}, max_dist=1.0, n_min=10, key=' ', threshold=3, drizzle=False, fit_order=-1, ref_exp=0, flux_radius=[0.5, 5], min_nexp=2, master_radec=None, make_figures=True)

Intra-visit shift alignment

Parameters

direct_groupdict

Visit info (product, files) for direct images

grism_groupdict

Visit info (product, files) for grism images

max_dist, thresholdfloat

Passed to tweak_flt

n_minint

Minimum number of sources for a valid fit.

drizzlebool

Run AstroDrizzle after performing the alignment

fit_orderint

If > 0, then fit a polynomial to the derived shifts rather than using the shifts themselves, e.g., for DASH imaging

ref_expint

Index of the exposure to use as the reference for the tweak shifts. If < 0, then use the exposure with the longest exposure time.

flux_radius, master_radec, make_figuresfloat, str, bool

See tweak_flt

Returns

Nothing, but updates WCS of direct and (optionally) grism exposures