A seamless global 5 km surface soil moisture product from 1982 to 2021

<p><span>Soil moisture (SM) is an essential climate-sensitive variable that exhibits high spatial and temporal variability. Long-term SM data records (&gt; 30 years) can benefit a range of climate change-related applications. A four-decade global 5-km daily SM product has been generated from 1982 to 2021, as part of the Global Land Surface Satellite (GLASS) products suite. This product (GLASS-AVHRR SM) was derived mainly from the GLASS-AVHRR albedo and LST products, the ERA5-Land reanalysis SM product, and auxiliary datasets, using an attention-based deep learning model. The GLASS-AVHRR SM product has the advantages of long-term coverage, spatial and temporal integrity, reliable accuracy and consistency.</span></p> <p><span>The data values in the GLASS-AVHRR SM product represent the volumetric water content of the uppermost soil layer (0&ndash;5 cm). The files are stored in geographic projection and provided in Geo Tiff format, with "No Data" values set to -9999.</span></p>