Photometric calibration is important for *all* science cases and it is intricately tied with the telescope observing strategy. Rolling, which is currently planned for LSST, adds another level of complication. While the investigations (happening within DESC so far; led by Eli Ryoff, Rubin Calibration Scientist; Matt Becker, DESC Pipeline Scientist; and Peter Yoachim from the Rubin Survey Strategy Team) into the impact of current rolling implementation seem promising, it may be worth having a broader discussion, especially to understand and discuss calibration needs/constraints for various stakeholders.

Depending on how many other Observing Strategy-related sessions/breakouts happen, this breakout could encompass a related topic: uniformity at target data releases which is relevant for quite a few science collaborations (DESC, Galaxies, SL), and is particularly important as we optimize the details of rolling.

## Agenda ##

• Peter Yoachim, Intro to Survey Baseline, Potential Uniformity Metric (15 min)
• Eli Rykoff, Current Understanding of Global Photometric Calibration and Survey Strategy (20 min)
• Loredana Prisinzano, Rubin LSST: Mapping the Milky Way with Star-Forming Regions (20 min)
• Others?