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  • 1
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    Radar scattering and soil moisture (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Research is being conducted on microwave scattering from vegetation. The objective is to develop techniques for measuring parameters of the vegetation canopy (such as biomass) needed for understanding global biogeochemical cycles and to develop techniques for correcting microwave measurements of soil moisture for the effects of the vegetation canopy. Measurements of vegetation and soil moisture are important for understanding the environment on a global scale. For example, moisture in the soil is an important, highly variable, element in the global hydrologic cycle. The hydrologic cycle, in turn, is strongly coupled to weather and climate through moisture (and energy) fluxes at the surface. The amount and distribution of vegetation is an important element in biogeochemical cycles; and knowledge of both the vegetation canopy and soil moisture is of practical importance in agricultural management. These theories are examined.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Laboratory for Oceans; p 239-241
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Deriving Soil Moisture with the Combined L-Band Radar and Radiometer Measurements (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In this study, we develop a combined active/passive technique to estimate surface soil moisture with the focus on the short vegetated surfaces. We first simulated a database for both active and passive signals under SMAP s sensor configurations using the radiative transfer model with a wide range of conditions for surface soil moisture, roughness and vegetation properties that we considered as the random orientated disks and cylinders. Using this database, we developed 1) the techniques to estimate surface backscattering and emission components and 2) the technique to estimate soil moisture with the estimated surface backscattering and emission components. We will demonstrate these techniques with the model simulated data and its validation with the airborne PALS image data from the soil moisture SGP 99 and SMEX 02 experiments.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC.CP.4276.2011 , 2011 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2011); Jul 24, 2011 - Jul 29, 2011; Vancouver; Canada
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Assessment of Version 4 of the SMAP Passive Soil Moisture Standard Product (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASAs Soil Moisture Active Passive (SMAP) mission launched on January 31, 2015 into a sun-synchronous 6 am6 pm orbit with an objective to produce global mapping of high-resolution soil moisture and freeze-thaw state every 2-3 days. The SMAP radiometer began acquiring routine science data on March 31, 2015 and continues to operate nominally. SMAPs radiometer-derived standard soil moisture product (L2SMP) provides soil moisture estimates posted on a 36-km fixed Earth grid using brightness temperature observations and ancillary data. A beta quality version of L2SMP was released to the public in October, 2015, Version 3 validated L2SMP soil moisture data were released in May, 2016, and Version 4 L2SMP data were released in December, 2016. Version 4 data are processed using the same soil moisture retrieval algorithms as previous versions, but now include retrieved soil moisture from both the 6 am descending orbits and the 6 pm ascending orbits. Validation of 19 months of the standard L2SMP product was done for both AM and PM retrievals using in situ measurements from global core calval sites. Accuracy of the soil moisture retrievals averaged over the core sites showed that SMAP accuracy requirements are being met.
    Keywords: Earth Resources and Remote Sensing
    Type: KJR-339 , GSFC-E-DAA-TN41665 , IEEE International Geoscience and Remote Sensing Symposium 2017; Jul 23, 2017 - Jul 28, 2017; Fort Worth, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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