NASA's Soil Moisture Active Passive (SMAP) mission originally included both passive and active L-band measurement capability. It was the first satellite instrument to provide global radar observations of normalized cross section ( $\sigma ^{o}$</inline-...

The Committee on Earth Observation Satellites (CEOS) Land Product Validation (LPV) subgroup has been established to coordinate the development of standardized validation across satellite-derived products from different platforms, sensors, and algorithms with reference measurements in situ networks. Soil moisture exhibits a high variability space that challenges validation. One main drivers for ...

The data assimilation of remotely sensed soil moisture observations provides a feasible path improving river flow simulation. In this work, we studied the performance error subspace transform Kalman filter (ESTKF) algorithm on from SMAP, including improvement and in hydrological model. Additionally, discussed advantages added value ESTKF compared to ensemble (EnKF) To achieve objective, solved ...

The Arctic Ocean is one of the most important and challenging regions to observe—it experiences largest changes from climate warming, at same time difficult sample because sea ice extreme cold temperatures. Two NASA-sponsored deployments Saildrone vehicle provided a unique opportunity for validating sea-surface salinity (SSS) derived three separate products that use data Soil Moisture Active Pa...