Code for reconstructing Northern Hemisphere active layer thickness at 1 km resolution (2000–2024)

This repository contains the core source code used for model training, leave-one-site-out cross-validation (LOSO-CV), annual active layer thickness (ALT) reconstruction, and uncertainty quantification for the 1 km Northern Hemisphere ALT dataset covering 2000–2024. The code accompanies the manuscript “A 1 km resolution dataset of Northern Hemisphere permafrost active layer thickness (2000–2024)”.