Changes to this version include: - Improved calibration methodology was applied to the Level-1B radiometer brightness temperatures. - Improved land surface model outputs from the NASA Global Modeling and Assimilation Office (GMAO) were used to estimate the effective soil temperature used as input to Level-2 soil moisture geophysical inversion. This effective soil temperature is not to be confused with the physical soil temperature at a given depth (Choudhury et al., 1982). - Improved retrieval performance of DCA (formerly known as MDCA or "the option 3" option algorithm in previous releases). DCA retrieves both soil moisture and vegetation optical depth (VOD or tau). - Use of a new global 250-meter resolution soils database called SoilGrid250m available at https://openlandmap.org. Work is underway to address limited spatial anomalies of these soil property estimates at high latitudes over areas rich in organic soils. - Added 30 new soil moisture retrieval fields associated with the two optional algorithms used in Level-2 soil moisture processing. - Data quality flags were updated and corrected where faulty. - The baseline algorithm (SCA-V) remains unchanged. For the full major and minor version history, go to https://nsidc.org/data/smap/version-history