Pre-registration amendment v2: When snow looks like water: wet-snow false floods in winter Sentinel-1 flood mapping of the Tensift basin (High Atlas, Morocco)

Amendment v2 to the pre-registration (v1: https://doi.org/10.5281/zenodo.23130459, published 2026-10-04 03:03 UTC). Published before the L1C calibration is run and before any confirmatory H1–H6 quantity is computed. Changes: (1) an output-schema correction of the CSV export (explicit selectors), which also restores the pre-registered NIR criterion; (2) a Sentinel-2 L1C fallback, used only for scenes with no L2A version, with an s2cloudless mask < 40% and no QA60; (3) an L1C/L2A calibration gate on the held-out pilot winter (2019–20) deciding whether the 9- or 7-winter analysis is primary (kappa >= 0.61, >= 100 snow pairs and >= 50% L1C visibility, all at >= 1,500 m); (4) a declared MODIS >= 20 sensitivity analysis. Only the extraction script changes among the frozen files (01_confirmatory_months_v2.js, SHA-256 a24bb080f2c89ee98e7ae453d371e48980cab4b4bfb44ab07e713cdb2f0f3e80). Full text: deviation_v2.pdf. Supporting files (calibration, sensitivity, validator, environment, evidence notes) are in supporting_files.zip and listed with hashes in MANIFEST_SHA256.txt. Contact: Ayoub Echchadiry, [email protected]