%0 Dataset
%T 90 m Active Layer Moisture Dataset for the Qinghai–Tibet Plateau Permafrost Region（2009-2024）
%J National Cryosphere Desert Data Center
%I National Cryosphere Desert Data Center(www.ncdc.ac.cn)
%U http://www.ncdc.ac.cn/portal/metadata/af40fdfc-84b9-4dbb-8ed5-2cadcf400964
%W NCDC
%R 10.12072/ncdc.permafrost.db7312.2026
%A Du erji
%K Qinghai Tibet Plateau;permafrost region;active layer moisture;machine learning
%X This dataset is a spatial distribution product of the volumetric moisture content of the active layer in the permafrost region of the Qinghai Tibet Plateau. It is produced to meet the research needs of permafrost hydrothermal processes, alpine hydrology, and ecological environment. It is the first high-resolution active layer moisture dataset in the region to cover the entire permafrost region, filling the data gap in continuous spatial mapping of active layer moisture at all depths on the Qinghai Tibet Plateau.  The data is based on 342 measured points in the permafrost region of the Qinghai Tibet Plateau from 2009 to 2024, including profile data measured by the ring knife method and ground penetrating radar (GPR) inversion data; Collaborative multi-source remote sensing factors (Sentinel-1 inversion NDVI、NDWI、 Modeling and generation of public goods such as surface temperature LST, SRTM 90m terrain factor, and China Land Surface Simulation Soil Attribute Dataset (CSDLv2).  Four integrated machine learning models (random forest, extreme random tree, XGBoost, CatBoost) were used for fusion, and SHAP recursive feature elimination was used to optimize feature combination. Five fold cross validation was used to ensure the model's generalization ability, and a bias aware multi model fusion strategy was adopted to correct system biases with low overestimation and high underestimation. Finally, a continuous spatial distribution of active layer moisture was obtained for the entire domain.  The data is a single band GeoTIFF grid, representing the annual average volume water content of the active layer during the peak melting period (September to October), in m ³ · m ⁻ ³. The spatial range is the permafrost region of the Qinghai Tibet Plateau, with a geographic coordinate system of GCSWGS_1984 and a spatial resolution of 90m. The time attribute is a comprehensive static cross-section for many years, without a time period; The file naming convention is clear and easy to batch