The Soil Moisture Active Passive (SMAP) Mission
Dara Entekhabi,Eni G. Njoku,Peggy O'Neill,Kent Kellogg,Wade T. Crow,W. Edelstein,Jared Entin,Shawn D Goodman,Thomas J. Jackson,Joel T. Johnson,John S. Kimball,Jeffrey R. Piepmeier,Randal D. Koster,Neil R.W. Martin,Kyle C. McDonald,Mahta Moghaddam,Susan Moran,Rolf H. Reichle,Jiancheng Shi,Michael W. Spencer,Samuel W Thurman,Leung Tsang,Jakob van Zyl +22 more
- Vol. 98, Iss: 5, pp 704-716
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The Soil Moisture Active Passive mission is one of the first Earth observation satellites being developed by NASA in response to the National Research Council's Decadal Survey to make global measurements of the soil moisture present at the Earth's land surface.Abstract:
The Soil Moisture Active Passive (SMAP) mission is one of the first Earth observation satellites being developed by NASA in response to the National Research Council's Decadal Survey SMAP will make global measurements of the soil moisture present at the Earth's land surface and will distinguish frozen from thawed land surfaces Direct observations of soil moisture and freeze/thaw state from space will allow significantly improved estimates of water, energy, and carbon transfers between the land and the atmosphere The accuracy of numerical models of the atmosphere used in weather prediction and climate projections are critically dependent on the correct characterization of these transfers Soil moisture measurements are also directly applicable to flood assessment and drought monitoring SMAP observations can help monitor these natural hazards, resulting in potentially great economic and social benefits SMAP observations of soil moisture and freeze/thaw timing will also reduce a major uncertainty in quantifying the global carbon balance by helping to resolve an apparent missing carbon sink on land over the boreal latitudes The SMAP mission concept will utilize L-band radar and radiometer instruments sharing a rotating 6-m mesh reflector antenna to provide high-resolution and high-accuracy global maps of soil moisture and freeze/thaw state every two to three days In addition, the SMAP project will use these observations with advanced modeling and data assimilation to provide deeper root-zone soil moisture and net ecosystem exchange of carbon SMAP is scheduled for launch in the 2014-2015 time frameread more
Citations
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Proceedings ArticleDOI
First Retrievals of ASCAT IB VOD (Vegetation Optical Depth) at Global Scale
Xiangzhuo Liu,Jean-Pierre Wigneron,Frédéric Frappart,Nicolas Baghdadi,Mehrez Zribi,Thomas Jagdhuber,Philippe Ciais,Xiaojun Li,Mengjia Wang,Lei Fan,Bertrand Ygorra,Hongliang Ma,Zanpin Xing,A. Al-Yaari,Roberto Fernandez-Moran,Christophe Moisy +15 more
TL;DR: In this paper, the radar-based global ASCATterometer IB (INRAE-BORDEAUX) VOD was retrieved using a model which was recently calibrated over Africa.
Journal ArticleDOI
Hybrid Method for Full-Wave Simulations of Forests at L-Band
TL;DR: In this paper , the full-wave simulations of 3D Maxwell equations of forests at L-band were carried out with a two-step hybrid method, in which the T-matrix of a single tree in the representation of vector cylindrical waves (VCW) was calculated by using the far-field scattering amplitudes obtained from the commercial solver FEKO.
Proceedings ArticleDOI
A Cavity System for Seawater Dielectric Measurements at P-Band
TL;DR: In this article , a transmission-type cylindrical cavity has been constructed with the P-band mode resonance occurring near 700 MHz, where seawater is introduced via a capillary quartz tube.
Journal ArticleDOI
The Impact of <i>In Situ</i> Probe Orientation on SMAP Validation Statistics
TL;DR: In this paper , the authors compare the correlation and unbiased root mean square error (ubRMSE) from the SMAP L2 radiometer soil moisture product when compared to vertical oriented probes.
References
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Journal ArticleDOI
The SMOS Mission: New Tool for Monitoring Key Elements ofthe Global Water Cycle
Yann Kerr,Philippe Waldteufel,Jean-Pierre Wigneron,Steven Delwart,Francois Cabot,Jacqueline Boutin,Maria-José Escorihuela,Jordi Font,Nicolas Reul,C. Gruhier,S. Juglea,Mark R. Drinkwater,Achim Hahne,Manuel Martin-Neira,Susanne Mecklenburg +14 more
TL;DR: The SMOS satellite was launched successfully on November 2, 2009, and will achieve an unprecedented maximum spatial resolution of 50 km at L-band over land (43 km on average over the field of view), providing multiangular dual polarized (or fully polarized) brightness temperatures over the globe.
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Microwave Remote Sensing
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Measuring soil moisture with imaging radars
P. Dubois,J.J. van Zyl,T. Engman +2 more
TL;DR: An empirical algorithm for the retrieval of soil moisture content and surface root mean square (RMS) height from remotely sensed radar data was developed using scatterometer data and inversion results indicate that significant amounts of vegetation cause the algorithm to underestimate soil moisture and overestimate RMS height.
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Radar remote sensing and surface scattering and emission theory
TL;DR: Monumental as discussed by the authors is a compilation of the present engineering state of the art of microwave remote sensing, presented as a survey of the state-of-the-art in the field.
Journal ArticleDOI
Vegetation effects on the microwave emission of soils
TL;DR: In this article, the authors evaluated published data to determine the functional dependence of a vegetation parameter on vegetation characteristics, and they proposed a model that attempted to meet these requirements by estimating the vegetation parameter b that characterizes the canopy.