Details
-
Type:
Improvement
-
Status: Done
-
Resolution: Done
-
Fix Version/s: None
-
Component/s: ts_aos
-
Labels:
-
Story Points:3
-
Epic Link:
-
Team:Telescope and Site
Description
Update the data/comcam segmentation.txt gain and read noise values and focalplanelayout.txt geometry (x,y position, overscan,prescan), sensor names, to make them consistent with those in obs_lsst for lsst.obs.lsst.LsstComCam instrument (i.e. R22 is ITL - https://github.com/lsst/obs_lsst/blob/master/policy/comCam/R22.yaml ). Use the new values from DM-28919 (https://github.com/lsst/obs_lsst/pull/292/files)
Attachments
Issue Links
Activity
Opened PR#14 to phosim_utils to mimic obs_lsst comcam filter names to enable ingest into gen3 butler repo.
Created DM-29424 to enable boresight translation for comCam.py in obs_lsst and make new tests for test_translator.py .
Implemented the review comments for PR#14 to phosim_utils, merged and closed PR. Released as phosim_utils v.0.2.2
Opened PR https://github.com/lsst-ts/phosim_syseng4/pull/7 to phosim_syseng4 with updated values for data/comcam segmentation.txt and focalplanelayout.txt
Changes to data/comcam (as in PR description) are duplicated here for traceability:
Updating `data/comcam` `segmentation.txt` and `focalplanelayout.txt` with geometry and CCD properties appropriate for `lsstComCam` instrument from `obs_lsst` (including recent changes from https://jira.lsstcorp.org/browse/DM-28919).
All changes are similar to https://github.com/lsst-ts/phosim_syseng4/pull/6 .
Summary of changes for `focalplanelayout.txt`
- removal of all rafts besides `R22` (`lsstComCam` consists of one raft, `R22` )
- Columns 1,2 : x,y -position [microns] updated using `detector.getBBox()`, `bbox.centerY`, `bbox.centerX` (phosim is rotated 90 degrees from lsstComCam)
- Columns 4,5: number of x,y pixels unchanged (consistent for an ITL chip with `lsstComCam` `xpx = bbox.getHeight()`, `ypx=bbox.getWidth()` )
- Columns 15,16: x,y shift set to 0,0 since correct positions are provided with Columns 1,2 (most substantially this is noticeable for the corner sensors)
Summary of changes for `segmentation.txt`:
- removal of all rafts besides `R22` (`lsstComCam` consists of one raft, `R22` )
- short lines: no change (sensor names and number of x,y pixels are the same as before)
- long lines:
- Columns 1,2,3,4: [xlo, xhi ,ylo, yhi] in px per amplifier - since `lsstComCam` is an ITL, these are unchanged, ( eg. `[0 1999 0 508]` )
- Columns 5,6 serial read / parallel read : for ITL serial read is always 1, and parallel read is 1 or -1 : these are unchanged
- Column 7 : new gain values
- Column 11 : new read noise values
- Column 15, 16, 17, 18: prescan / overscan values, preserving phosim's rotation of 90 degrees to the left wrt lsstComCam . This means that the following was adopted (and tested):
| phosim name | lsstComCam name | amplifier property | bbox property |
|---|---|---|---|
| serial overscan | parallel prescan | – | – |
| serial prescan | parallel overscan | amp.getRawParallelOverscanBBox() | bbox.getHeight() |
| parallel overscan | serial overscan | amp.getRawSerialOverscanBBox() | bbox.getWidth() |
| parallel prescan | serial prescan | amp.getRawSerialPrescanBBox() | bbox.getWidth() |
This translates to
| row meaning \ phosim name | parallel prescan | serial overscan | serial prescan | parallel overscan |
|---|---|---|---|---|
| phosim values | 3 | 0 | 10 | 10 |
| lsstComCam (ITL) | 3 | 0 | 48 | 32 |
Reviewed the PRs in this ticket. Good improvement and useful update! Thanks!
This involved making changes to phosim_utils to use LsstComCam instrument - PR#13 https://github.com/lsst-dm/phosim_utils/pull/13 - that are already merged. Released as phosim_utils v.0.2.1. Also made an update to obs_lsst to recognize phosim-looking-like-comcam files and properly translate the heade - PR#298 was merged https://github.com/lsst/obs_lsst/pull/298 .