Code, derived data and verification script for "What free satellite images can and cannot show before Himalayan rock–ice collapses"

Code, derived data and verification script for the preprint "What free satellite images can and cannot show before Himalayan rock–ice collapses: four test sites and a screen of twelve Nepal corridors" (Sah, 2026). The package contains the Sentinel-2 offset-tracking pair stacks (band 8, 10 m, 80 m cells) for twelve Nepal corridor windows and four test sites (Chamoli 2021, Budhi Gandaki 2026, Langtang Lirung 2026, Thame 2024), the scripts that turn them into every result of the paper, the expected outputs, and verify_p7.py, which re-runs 82 analysis steps offline and compares the results with the expected outputs (about 10-20 minutes on a laptop; NumPy 2 needed). Logs of the check on the author's computer (macOS, Python 3.9) and in the cloud workspace (Linux, Python 3.13) are included: 105 of 105 steps OK or skipped, 0 problems. See README.md. Licences: code MIT (LICENSE); derived data CC BY 4.0; the two outline masks in data_nc/ are CC BY-NC 4.0, derived from Shean et al. (2021, doi:10.5281/zenodo.4558692) and Shean and Bhushan (2026, doi:10.5281/zenodo.22842746 and 10.5281/zenodo.22842748); Copernicus DEM GLO-30/GLO-90 under the Copernicus DEM licence; GeoNames CC BY 4.0; RGI 6.0 CC BY 4.0; Natural Earth public domain. Details and required notices: LICENSE-DATA.md. Contains modified Copernicus Sentinel data 2015-2026. The two Langtang DEMs are not included (CC BY-NC; download from Zenodo). The code was written by Claude (Anthropic), an AI assistant, at the author's request; this is declared in the preprint. The author ran the verification on his own computer.