Compute 2D drift/jitter for JWST imaging or spectroscopy

[iancrossfield]

E.g., adapt the existing Stage 3 code (that computes a 2D drift/jitter for HST data --see calcDrift2D in hst_scan.py) so that we can get these same diagnostics for JWST data as well. Sooner or later, someone will probably want it!

[kevin218]

Will need to add correct_drift2D function to the instrument python files (e.g. nirspec.py).

[taylorbell57]

I agree that this would definitely be good to have, but as of now none of the simulated data has pointing jitter or drift, so I don't think that this should be a priority for the time being. I am hoping to make a MIRI/LRS simulation with pointing jitter at some point, so that could be a good opportunity to develop and test 2D drift/jitter correction for JWST instruments. That won't be until after the data challenge though

[kevin218]

The NIRSpec data have jitter because they are based on actual CV3 observations. My bet is this jitter is why optimal spectral extraction with the median frame isn't working well.

[taylorbell57]

Oh interesting, I hadn't appreciated that!