[PIPE2D-857] Apply sky subtraction, deduced from DCB to SuNNS data, for limited number of fibers Created: 18/Jun/21  Updated: 29/Jan/22  Resolved: 24/Aug/21

Status: Done
Project: DRP 2-D Pipeline
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Normal
Reporter: ncaplar Assignee: ncaplar
Resolution: Done Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Attachments: PNG File Screen Shot 2021-08-03 at 12.59.04 PM.png     PDF File Summary_v1.pdf    
Issue Links:
Blocks
is blocked by PIPE2D-793 Update sky subtraction to work across... Done
is blocked by PIPE2D-874 Centering/offset/interpolation - fix ... Done
Story Points: 4

 Description   

Apply algorithm introduced in PIPE2D-793 to real SuNNs data.

We want to test how the current implementation of Zernike-based 2d psf will handle SuNNs data.

The limitations will be:
1. only some fibers available
2. somewhat different pupil illumination of DCB data and SuNNs data
3. relatively poor fit in red, which in the meantime has been improved, but I have not generated full solutions

Nonetheless, this is critical for testing the implementation and identifying possible problems.

 Comments   
Comment by ncaplar [ 04/Aug/21 ]

I have uploaded image showing the first example of sky subtraction in SuNNS.  The left panel is without continuum subtraction, the right with continuum subtraction. This zoom shows the blue part of the red detector, where the subtraction is better. The files are in 

/projects/HSC/PFS/Subaru/rerun/ncaplar/PIPE2D-857_SuNNS_Aug_subtractContinuum/

and 

/projects/HSC/PFS/Subaru/rerun/ncaplar/PIPE2D-857_SuNNS_Aug/

The obvious centering/downsampling issue seems to be solved. I see few problem, but I have to do a full analysis and I will report here on the problems that I encounter. 

Comment by ncaplar [ 06/Aug/21 ]

I have uploaded yesterday the presentation (Summary_v1.pdf) with examples of several types of issues that I have encountered. I will update this pdf periodically. After discussion (Monday Princeton meeting?) I plan to open tickets regarding the issues that I have noticed.

Comment by ncaplar [ 24/Aug/21 ]

This ticket has been successfully completed. In the meantime, we have identified a number of issues, for which tickets have been issued (PIPE2D-883 to PIPE2D-885). 

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