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Updated: Aug 9, 2025

In Situ Soil Moisture Sensors in Undisturbed Soils
Published on: November 18, 2022
Global long term daily 1 km surface soil moisture dataset with physics informed machine learning
Qianqian Han1, Yijian Zeng1, Lijie Zhang2
1Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, 7514 AE, Enschede, The Netherlands.
Abstract:
Although soil moisture is a key factor of hydrologic and climate applications, global continuous high resolution soil moisture datasets are still limited. Here we use physics-informed machine learning to generate a global, long-term, spatially continuous high resolution dataset of surface soil moisture, using International Soil Moisture Network (ISMN), remote sensing and meteorological data, guided with the knowledge of physical processes impacting soil moisture dynamics. Global Surface Soil Moisture (GSSM1 km) provides surface soil moisture (0-5 cm) at 1 km spatial and daily temporal resolution over the period 2000-2020. The performance of the GSSM1 km dataset is evaluated with testing and validation datasets, and via inter-comparisons with existing soil moisture products. The root mean square error of GSSM1 km in testing set is 0.05 cm3/cm3, and correlation coefficient is 0.9. In terms of the feature importance, Antecedent Precipitation Evaporation Index (APEI) is the most important significant predictor among 18 predictors, followed by evaporation and longitude. GSSM1 km product can support the investigation of large-scale climate extremes and long-term trend analysis.
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