Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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How is remote sensing exploited? • The signals detected by the sensors are immediately converted into digital numbers and transmitted to dedicated receiving stations, where these data are heavily processed. • The effective exploitation of remote sensing data to reliably generate useful, pertinent information hinges on the availability and performance of specific tools and techniques of data analysis and interpretation. • A variety of mathematical models can be used for this purpose; they are implemented as computer codes that read the data or intermediary products and ultimately lead to the generation of products and services usable in specific applications…. User is happy ! 4
Model of radiation transfer • Since space borne instruments can only measure the properties of electromagnetic waves emitted or scattered by the Earth, scientists need first to understand where these waves originate from, how they interact with the environment, and how they propagate towards the sensor. • To this effect, they develop models of radiation transfer, assuming that everything is known about the sources of radiation and the environment, and calculate the properties of the radiation field as the sensor should measure them. This is the so-called direct problem. 5
Page 1 and 2: Radiative Transfer Modeling …. ov
Page 3: Satellites have different “eyes
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 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
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Outline • Radiative Transfer Equa
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Association of physical measurement
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Model Inversion • In general, the
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Space Observation Strategies Source
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Overview of MISR Ref: http://www-mi
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Bidirectional Reflectance Factor at
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Bidirectional Reflectance Factor at
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Fraction of Absorbed Photosynthetic
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Scheme for the algorithm optimizati
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RT model driven improvement for FAP
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JRC-FAPAR products Equivalent phys
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08/01 08/02 08/03 08/04 08/05 08/06
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Validation protocol • The perform
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Rice (Pavia, IT) FAPAR July 2003 Lo
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Ground-based Estimations • Three
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http://fapar.jrc.it/ 85
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Vegetation Radiative Transfer Modelling (Nadine Gobron) - PEER

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