Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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0.5 Ground-based Estimations • Three issues and caveats among others: - Date and time of acquisition SRF1: 09 July 2004 Fapar 0.45 0.4 0.35 ±0.1 0.3 +2 hours 0.25 0.2 Source: M. Meroni (DISAFRI-Unitus) 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 82 Time of day
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) FAPAR Measurements Widlowski J.-L., et. al. (2006) ‘Horizontal radiation transport in 3-D forest canopies at multiple spatial resolutions: Simulated impact on canopy absorption’, RSE 83
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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’ •
Page 31 and 32: ~ 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: Rice (Pavia, IT) FAPAR July 2003 Lo
Page 85 and 86: http://fapar.jrc.it/ 85
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Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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