DP0.1 was run with pipelines version v19.0.0 w_2019_46
DP0.2 was run with pipelines version v23.0.0 w_2021_40

With 2 releases per year, there was 2 years of development between versions used:
Release notes can be found for the past 2 years at: https://pipelines.lsst.io/releases/index.html

The major changes include:

• Generation 3 middleware
• Difference Imaging Analysis (DIA) Pipeline
• Native transformation of parquet tables to the standard data model: https://dm.lsst.org/sdm_schemas/browser/
• Scarlet for deblending on coadd measurement and major change in columns that build up `detect_isPrimary`
• Streak masking during coaddition
• Addition of sky objects in Object Tables and sky sources Source Tables.
• GAAP columns in the Object table for galaxy colors
• Updated the thresholds for per detector visit-level PSF quality safeguards for inclusion in coadds  ().  This is to ensure detectors with "bad" PSF model fits do not get included in the coadd.  Specifically, we set the following for LSSTCam-imSim:
  • maxEllipResidual = 0.0045 (default is 0.007)
  • maxScaledSizeScatter = 0.006 (default is 0.009)
• Single Frame Configs:
  • Used chebyshev polynomial order for background fitting = 1 and no SkyCorrection
  • Source selection for measurePsf in `charImage`: charImage.measurePsf.starSelector["objectSize"].signalToNoiseMin = 50
    * Compare https://github.com/lsst/obs_lsst/blob/dc2/run2.2/config/imsim/processCcd.py with https://github.com/lsst/obs_lsst/blob/v23.0.x/config/imsim/characterizeImage.py and https://github.com/lsst/obs_lsst/blob/v23.0.x/config/imsim/calibrate.py
  • Added a delta-magnitude (source vs. reference) rejection to astrometry fitting task ( , )
  • Added a maximum mean offset threshold for the SFM astrometry fit to be considered a "success" ().  This safeguards against detectors whose fit did converge but had high on-sky scatter from getting into the coadds.
• + Survey Property Maps

Known Issues:

• No Forced Photometry on the goodSeeingCoadd templates: aka "light curve zeropoints."
• Deprecation warnings in logs for PSF.computeShape() deprecation ()
  • RFC-796
• ComputeShape(defaultPosition) on template errors on imageDifference Task ()
• Underestimated variance planes in patch overlaps of templates ()