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Last modified on 22 December 2016, at 10:17

Using QL outputs

Revision as of 10:17, 22 December 2016 by Gilbank (Talk | contribs) (Created page with "== Overview == The QL Tool produces quick-look products, but there are some straightforward steps allowing users to use these as a starting point for their science quality re...")

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Overview

The QL Tool produces quick-look products, but there are some straightforward steps allowing users to use these as a starting point for their science quality reductions

Important Notes

In going from the raw 2D images to the 1D extractions produce by the QL Tool:

  • The x axis is flipped so that increasing wavelength runs in the same direction as increasing x
  • The spectra are then trimmed to remove overscan, etc.

The exact values for these are stored in: /usr/local/etc/qlgui/pars.json

"badMax0": 98,

"badMin1": 2145,

in python 0-based numbering.


i.e. in python, to reproduce the same transformation:

from astropy.io import fits
im2D = fits.getdata('image.fits')

im2D = im2D[:,-:] # flip x

im2D = im2D[:,98:2145] # trim

fits.writeto('outimage.fits',im2D)