Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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• JRC Products with SeaWiFS data (0.5°x0.5°, 0.25°x0.25°,10 km x 10 km, 10-day & monthly) [1997/10-2005/06] (<strong>Gobron</strong> et al. 1999, 2001) http://fapar.jrc.it/ at Global Scale • ESA Products with MERIS data [2002-end of mission] (<strong>Gobron</strong> et al. 1999) http://envisat.esa.int/ 78
Validation protocol • The performance for detecting various events (verisimilitude) is assessed against the time-series of well documented land surface features. • The comparison against ground-based estimates can be performed recognizing the following: – Categorization of land validation site in their respective radiative transfer regime (not shown here) – Series of approximation to derive FAPAR from ground-based measurement sets. 79
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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
Page 11 and 12:
Basic Processes (2) •The upward a
Page 13 and 14:
Conservation of radiant energy for
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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 25 and 26:
Outline • Radiative Transfer Equa
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 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: 08/01 08/02 08/03 08/04 08/05 08/06
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
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Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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