Processing math: 100%

NOD_CHOP_SCAN

Reduces a chopped and nodded observation in a scan pattern

Description:

This script reduces chopped and nodded observation, currently just for Michelle data. It takes an imaging observation comprising a multiple-of-four object frames at a series of scan offset positions to make calibrated, untrimmed mosaics at each scan position automatically.

It performs a null debiassing, creation and propagation of data variance, difference the integrations for each AB chop beam pair, bad-pixel masking, difference adjacent nodded pairs, registers the frames, and forms a mosaic at each scan position. See the “Notes” for further information.

Notes:

Output Data

Parameters:

NUMBER = INTEGER
The number of frames in the nod pattern. If absent, the number of offsets, as given by header NOFFSETS, minus one is used. If neither is available, 4 is used. An error state arises if the number of jittered frames is fewer than 4 and not a multiple of 4. []
USEVAR = LOGICAL
Whether or not to create and propagate variance arrays. [1]

Related Recipes

NOD_CHOP, NOD_SELF_FLAT_NO_MASK_APHOT,

Implementation Status: