smap soil moisture observations
Level 3 products are daily composites of Level 2 surface soil moisture and freeze/thaw state data.
Level 3 products are daily composites of Level 2 surface soil moisture and freeze/thaw state data.
They are not as accurate as the higher quality products, L1B_TB and L2_SM_P, and are not recommended for science users. The L1C_S0_HiRes AM data will also be utilized to generate a freeze/thaw binary state flag for use in the L2/3_SM product algorithms. L2_SM_P_E is soil moisture derived from the Backus-Gilbert interpolated radiometer brightness temperature measurements and is posted at 9 km. It includes its own separate and independent life-of-mission storage this is mirrored to the Research & Analysis system for cal/val analysis. The testbed hosts a collection of data from the European Soil Moisture Ocean Salinity (SMOS) mission that are used for SMAP algorithm development and validation.The SMAP team employs the testbed to implement and evaluate alternative algorithmic approaches. L2_SM_SP is a combination Sentinel-1 active and SMAP passive (radar and radiometer) product that produces soil moisture estimates at 3 km resolution.The radar-only soil moisture (L2_SM_A) is a fine-resolution (3 km) soil moisture estimate derived from high-resolution radar backscatter data (L1C_S0_HiRes). Level 1 products contain instrument-related data and appear in granules that are based on half orbits of the SMAP satellite. SMAP will provide global observations of soil moisture and freeze/thaw state, together termed the hydrosphere state. Model data sets that contain This design traces physical processes recorded by instruments and modeled by algorithms that convert instrument data into geophysical quantities. Level 2 products are geophysical retrievals of soil moisture on a fixed Earth grid based on Level 1 products and ancillary information; the Level 2 products are output on a half-orbit basis. Finally, the model interpolates and extrapolates SMAP observations in time and in space, producing 3-hourly estimates of soil moisture at a 9 km resolution. The portal provides access to a subset of the SMAP data products that reside on the testbed. In this study, we show that these reports have remarkable correspondence with the National Aeronautics and Space Administration Soil Moisture Active Passive (SMAP) Level‐4 Soil Moisture (L4SM) product.
The reflector is offset from nadir and rotates about the nadir axis at 14.6 rpm, providing a conically scanning antenna beam with a surface incidence angle of approximately 40°. Estimating surface soil moisture from SMAP observations using a Neural Network technique. Current access to the portal is limited to members of the SMAP Science Team.The SDS operational data have been automatically distributed through DAACs for archive and distribution to users. SMAP, or Soil Moisture Active Passive, is an Earth satellite mission that measures and maps Earth's soil moisture and freeze/thaw state to better understand terrestrial water, carbon and energy cycles.
It is derived from high resolution radar data (L1C_S0_HiRes half-orbits) using both the AM (descending) and PM (ascending) overpasses. Level 2 to Level 4 beta products were released 6 months after IOC.
Sources of these data sets include in-situ, airborne, and spaceborne instruments. The Testbed supports algorithm software development and enhancements, as well as houses Research & Analysis tools that assess current output products and provides insights for algorithm correction and improvements.The second environment, Offline Algorithm Staging and Input System (OASIS) is a flexible independent instance of the SDS production system to generate large quantities of evaluation products.
Current versions of these algorithms can ingest multiple versions of data sets as well as data collected from field validation campaigns.Multiple ancillary data sets required for processing reside on the testbed. OASIS is used for moderate-scale reprocessing of data with updated algorithms.
Soil moisture observations from the Soil Moisture and Ocean Salinity (SMOS) [1] and Soil Moisture Active Passive (SMAP) missions [2, 3] contribute to understanding Earth’s water and climate cycles. The reflector has a diameter of 6 m, providing a radiometer footprint of 40 km.
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