Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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Ground-based Estimations • Three issues and caveats among others: - Date and time of acquisition - Spatial resolution: in-situ measurements at very high resolution (1 m) to be extrapolated at the medium resolution pixel (number and spatial distribution of the samples, impact of horizontal fluxes) - Approximation of FAPAR by the intercepted radiation (impact of woody elements), i.e. FAPAR (μ0) ≈ FIPAR (μ0) = 1-T(μ0) See … <strong>Gobron</strong> N., et. al. (2006) ‘Evaluation of FAPAR Products for Different Canopy Radiation <strong>Transfer</strong> Regimes: Methodology and Results using JRC Products Derived from SeaWiFS and Groundbased Estimations', JGR, DOI 10.1029/2005JD006511 84
http://fapar.jrc.it/ 85
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Radiative Transfer Modeling …. ov
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Satellites have different “eyes
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Model of radiation transfer • Sin
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Outline • Radiative Transfer Equa
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• The system under consideration
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Basic Processes (2) •The upward a
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Conservation of radiant energy for
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Asymmetry factor for scattering pro
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Single scattering albedo ↓ ∂I (
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Two-stream equations • In a more
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Extension to N Flux (2) In the limi
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Atmosphere Vegetation Soil Vertical
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Outline • Radiative Transfer Equa
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Discrete canopy: 1D representation
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Vegetation ‘Optical Depth’ •
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~ Extinction coefficient σ ( z, Ω
Page 33 and 34: Leaf Orientations Vegetation foliag
Page 35 and 36: Leaf scattering properties • Leaf
Page 37 and 38: Canopy scattering phase function
Page 39 and 40: •When the radiation is scattered
Page 41 and 42: Separation of Scattering Order ρ (
Page 43 and 44: I 0 ↑ (H, Ω, Ω 0 ) = 1 π γ s
Page 45 and 46: Uncollided BRF in Principal Plan So
Page 47 and 48: Uncollided BRF in Cross Plan Solar
Page 49 and 50: First collided Intensity (2) The fi
Page 51 and 52: Single Collided BRF in Principal Pl
Page 53 and 54: Ω•∇I λ (x,Ω)+G(x,Ω)u L (x)I
Page 55 and 56: Outline • Radiative Transfer Equa
Page 57 and 58: Association of physical measurement
Page 59 and 60: Model Inversion • In general, the
Page 61 and 62: Space Observation Strategies Source
Page 63 and 64: Overview of MISR Ref: http://www-mi
Page 65 and 66: Bidirectional Reflectance Factor at
Page 67 and 68: Bidirectional Reflectance Factor at
Page 69 and 70: Fraction of Absorbed Photosynthetic
Page 71 and 72: Scheme for the algorithm optimizati
Page 73 and 74: RT model driven improvement for FAP
Page 75 and 76: JRC-FAPAR products Equivalent phys
Page 77 and 78: 08/01 08/02 08/03 08/04 08/05 08/06
Page 79 and 80: Validation protocol • The perform
Page 81 and 82: Rice (Pavia, IT) FAPAR July 2003 Lo
Page 83: Ground-based Estimations • Three
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Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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