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A Comparative Study of the SMAP Passive Soil Moisture Product With Existing Satellite-Based Soil Moisture Products.
Burgin, Mariko S; Colliander, Andreas; Njoku, Eni G; Chan, Steven K; Cabot, Francois; Kerr, Yann H; Bindlish, Rajat; Jackson, Thomas J; Entekhabi, Dara; Yueh, Simon H.
Afiliación
  • Burgin MS; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA.
  • Colliander A; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA.
  • Njoku EG; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA.
  • Chan SK; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA.
  • Cabot F; Centre d'Études Spatiales de la Biosphère, Centre National d'Études Spatiales, 31401 Toulouse, France.
  • Kerr YH; Centre d'Études Spatiales de la Biosphère, Centre National d'Études Spatiales, 31401 Toulouse, France.
  • Bindlish R; NASA Goddard Space Flight Center, Greenbelt, MD 20771 USA.
  • Jackson TJ; U.S. Department of Agriculture, Agricultural Research Service, Hydrology and Remote Sensing Laboratory, Beltsville, MD 20705 USA.
  • Entekhabi D; Massachusetts Institute of Technology, Cambridge, MA 02139 USA.
  • Yueh SH; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA.
IEEE Trans Geosci Remote Sens ; 55(5): 2959-2971, 2017 May.
Article en En | MEDLINE | ID: mdl-32753775
The NASA Soil Moisture Active Passive (SMAP) satellite mission was launched on January 31, 2015 to provide global mapping of high-resolution soil moisture and freeze-thaw state every 2-3 days using an L-band (active) radar and an L-band (passive) radiometer. The Level 2 radiometer-only soil moisture product (L2_SM_P) provides soil moisture estimates posted on a 36-km Earth-fixed grid using brightness temperature observations from descending passes. This paper provides the first comparison of the validated-release L2_SM_P product with soil moisture products provided by the Soil Moisture and Ocean Salinity (SMOS), Aquarius, Advanced Scatterometer (ASCAT), and Advanced Microwave Scanning Radiometer 2 (AMSR2) missions. This comparison was conducted as part of the SMAP calibration and validation efforts. SMAP and SMOS appear most similar among the five soil moisture products considered in this paper, overall exhibiting the smallest unbiased root-mean-square difference and highest correlation. Overall, SMOS tends to be slightly wetter than SMAP, excluding forests where some differences are observed. SMAP and Aquarius can only be compared for a little more than two months; they compare well, especially over low to moderately vegetated areas. SMAP and ASCAT show similar overall trends and spatial patterns with ASCAT providing wetter soil moistures than SMAP over moderate to dense vegetation. SMAP and AMSR2 largely disagree in their soil moisture trends and spatial patterns; AMSR2 exhibits an overall dry bias, while desert areas are observed to be wetter than SMAP.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: IEEE Trans Geosci Remote Sens Año: 2017 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: IEEE Trans Geosci Remote Sens Año: 2017 Tipo del documento: Article Pais de publicación: Estados Unidos