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Published byDarren McConnell Modified over 2 years ago

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MoistureMap: Multi-Angle Retrieval Sandy Peischl PhD-candidate Jeffrey Walker, Dongryeol Ryu, Christoph Rüdiger, Damian Barrett, Robert Gurney, Jetse Kalma, Yann Kerr, Ed Kim and John LeMarshall

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MoistureMap: Multi-angle retrieval Soil Moisture Ocean Salinity SMOS records brightness temperature values over incidence angles from 0° to 55° Improve accuracy of soil moisture retrieval using inversion scheme of L-meb by investigation of look angle effects on ancillary data Source: www.smos-bec.icm.csic.es Tilt 32° Nadir Earth

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MoistureMap: Multi-angle retrieval Bare soil: Fresnel equation, where = sensor look angle r = dielectric constant relative to free space h,v = polarization <

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MoistureMap: Multi-angle retrieval Bare soil: Fresnel equation, where = sensor look angle r = dielectric constant relative to free space h,v = polarization

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MoistureMap: Multi-angle retrieval Bare soil: Source: Ulaby et al., 1986 Fresnel equation, where = sensor look angle r = dielectric constant relative to free space h,v = polarization

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MoistureMap: Multi-angle retrieval Vegetated soil: where, is the transmissivity of the vegetation layer T veg is the physical temperature of vegetation (K) T soil is the physical temperature of soil (K) ω is the single scattering albedo of the vegetation is the optical depth at nadir and published in Davenport et al., 2005 T b soil T b veg T b veg +T b soil

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MoistureMap: Multi-angle retrieval Vegetated soil: L < L’ < where, is the transmissivity of the vegetation layer T veg is the physical temperature of vegetation (K) T soil is the physical temperature of soil (K) ω is the single scattering albedo of the vegetation is the optical depth at nadir and published in Davenport et al., 2005

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MoistureMap: Multi-angle retrieval Vegetated soil: where, is the transmissivity of the vegetation layer T veg is the physical temperature of vegetation (K) T soil is the physical temperature of soil (K) ω is the single scattering albedo of the vegetation is the optical depth at nadir and published in Davenport et al., 2005 T soil = 298.15 K T veg = 298.15 K Type = Grassland VWC = 2; b = 0.15

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MoistureMap: Multi-angle retrieval Look Angle Brightness Temperature Transmissivity Vegetation Temperature Single Scattering Albedo Soil Temperature Emissivity Vegetation Soil Vegetation Water Content Soil Water Content Soil Properties Roughness

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MoistureMap: Multi-angle retrieval Transmissivity influence of vegetation structure (Hornbuckle et al., 2003, Wigneron et al., 1995) for great incidence angles polarization ratio indicator of interception (Saleh et al., 2006) Single Scattering Albedo low value for L-Band according to literature dependence on look angle not clearly demonstrated (Wigneron et al., 2007) Surface Roughness effects differ strongly at different look angles (Shi et al., 2002) Current understanding of angular dependence

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MoistureMap: Multi-angle retrieval Polarimetric L-Band Multibeam Radiometer 2005 T b -observations at six along-track view angles with 250 m resolution 2006 T b -observations at six along-track view angles with 500 m resolution

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MoistureMap: Multi-angle retrieval Outlook understanding + modeling of incidence angle dependence on ancillary data improved retrieval of soil moisture and related key variables application to SMOS data + verification using Murrumbidgee flights

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