# Evaluate the impact of imageCoCenter with AuxTel data

XMLWordPrintable

#### Details

• Type: Improvement
• Status: Done
• Resolution: Done
• Fix Version/s: None
• Component/s:
• Labels:
• Story Points:
3
• Team:
Telescope and Site

#### Description

Evaluate the impact of imageCoCenter with auxTel data . Consider whether this part  has been implemented correctly, given that field of view is a kwarg in imageCoCenter https://github.com/lsst-ts/ts_wep/blob/28ba52920896b412b6cdff6465af135c33860905/python/lsst/ts/wep/cwfs/CompensableImage.py#L273  , and it is not set when calling imageCoCenter in Algorithm  https://github.com/lsst-ts/ts_wep/blob/28ba52920896b412b6cdff6465af135c33860905/python/lsst/ts/wep/cwfs/Algorithm.py#L702  (thus it is always 3.5 deg).

#### Attachments

1. image-2022-11-02-16-29-31-334.png
113 kB
2. image-2022-11-02-16-31-12-960.png
156 kB

#### Activity

Hide
Krzysztof Suberlak added a comment -

Given the results of analysis in this notebook https://github.com/suberlak/AOS/blob/main/AOS_DM-36840_cocenter_auxTel_data.ipynb   imageCoCenter step has no impact on  running the CWFS code on auxTel images. Although the FOV is incorrect (Algorithm assumes the 3.5 degrees regardless of instrument) ,  the small  field distance (up to 6.7/2 arcmin for auxTel) means that the calculated shift is very small (less than 3.5 px for maximally distant donut):

We find that the amount of radialShift has to be increased beyond 5.5 px to make any difference:

To impart this amount of radialShift, auxTel donuts would  have to be outside of the field of view. Thus imageCoCenter can be safely removed when it comes to analysis of auxTel images.

Show
Krzysztof Suberlak added a comment - Given the results of analysis in this notebook https://github.com/suberlak/AOS/blob/main/AOS_DM-36840_cocenter_auxTel_data.ipynb    imageCoCenter step has no impact on  running the CWFS code on auxTel images. Although the FOV is incorrect (Algorithm assumes the 3.5 degrees regardless of instrument) ,  the small  field distance (up to 6.7/2 arcmin for auxTel) means that the calculated shift is very small (less than 3.5 px for maximally distant donut):    We find that the amount of radialShift has to be increased beyond 5.5 px to make any difference: To impart this amount of radialShift, auxTel donuts would  have to be outside of the field of view. Thus imageCoCenter can be safely removed when it comes to analysis of auxTel images.
Hide
Krzysztof Suberlak added a comment -

Performed the analysis similar to https://jira.lsstcorp.org/browse/DM-36714 - the results support removal of imageCoCenter

Show
Krzysztof Suberlak added a comment - Performed the analysis similar to https://jira.lsstcorp.org/browse/DM-36714  - the results support removal of imageCoCenter

#### People

Assignee:
Krzysztof Suberlak
Reporter:
Krzysztof Suberlak
Reviewers:
Bryce Kalmbach
Watchers:
Andrew Connolly, Bryce Kalmbach, Krzysztof Suberlak