Snow on Xiaolan Xuhttps://xiaolan.in/tags/snow/Recent content in Snow on Xiaolan XuHugoenThu, 17 Sep 2026 00:00:00 +0000Per-Pixel Uncertainty and Physical Understanding as the Basis for Trusthttps://xiaolan.in/blog/trust-in-multi-instrument-products/Thu, 17 Sep 2026 00:00:00 +0000https://xiaolan.in/blog/trust-in-multi-instrument-products/In July I wrote about a question that changed how I think about my work — a question about whether validation data ever actually changes the retrieval model, or just checks it. That question led to months of conversation with Nicolas Rouquette (formal methods and systems engineering) and Amy Braverman (statistical uncertainty quantification at JPL), and eventually to a white paper we submitted to NASA’s Earth Science Decadal Survey 2028 Request for Information.