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NASA's Spatial Statistical Data Fusion (SSDF) Level 3 dataset provides daily estimates of near-surface vapor pressure deficit over the continental United States. The product fuses data from the AIRS instrument on Aqua and the CrIMSS suite on Suomi-NPP, using a statistical algorithm that weights inputs by their estimated variance. It provides these estimates on a consistent ¼-degree latitude/longitude grid.
License is specified as 'other-license-specified' on datagov but is 'None' on nasa_earthdata; users must verify terms. File formats include BIN, PDF, ISO, HTML, PNG, suggesting ancillary documentation and possibly binary data files.