Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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Specific Effects •The presence of finite size scatterers implies that the radiation interception process by the leaves will not follow a continuous scheme, and in particular that radiation will be allowed to travel unimpeded within the free space between the scatterers. •Since extinction occurs only at discrete locations, some of the radiation emerging from an arbitrary source, located inside or outside the canopy, any occasionally travel without any interaction in this canopy, depending on the shape and size of free space between these leaves. Verstraete, M. M et. al. (1990) 'A physical model of the bidirectional reflectance of vegetation canopies; Part 1: Theory', Journal of Geophysical Research, 95, 11,755-11,765. <strong>Gobron</strong>, N et. al. (1997) ‘A semi-discrete model for the scattering of light by vegetation’, Journal of Geophysical Research, 102, 38 9431-9446.
•When the radiation is scattered back in the direction from which it originates, the probability of further interaction with the canopy is lower than in other scattering directions. •In case of RS measurements outside the canopy, this give rise to a relative increase in the value in the backscattering direction which is knows as the hot-spot phenomenon. Hot-spot Effects Verstraete, M. M et. al. (1990) 'A physical model of the bidirectional reflectance of vegetation canopies; Part 1: Theory', Journal of Geophysical Research, 95, 11,755-11,765. <strong>Gobron</strong>, N et. al. (1997) ‘A semi-discrete model for the scattering of light by vegetation’, Journal of Geophysical Research, 102, 39 9431-9446.
Page 1 and 2: Radiative Transfer Modeling …. ov
Page 3 and 4: Satellites have different “eyes
Page 5 and 6: Model of radiation transfer • Sin
Page 7 and 8: Outline • Radiative Transfer Equa
Page 9 and 10: • The system under consideration
Page 11 and 12: Basic Processes (2) •The upward a
Page 13 and 14: Conservation of radiant energy for
Page 15 and 16: Asymmetry factor for scattering pro
Page 17 and 18: Single scattering albedo ↓ ∂I (
Page 19 and 20: Two-stream equations • In a more
Page 21 and 22: Extension to N Flux (2) In the limi
Page 23 and 24: Atmosphere Vegetation Soil Vertical
Page 27 and 28: Discrete canopy: 1D representation
Page 29 and 30: 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: Canopy scattering phase function
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 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 and 84: Ground-based Estimations • Three
Page 85 and 86: http://fapar.jrc.it/ 85

Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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