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Modèle d'architecture d'arbre : A telier de M odélisation de l' A rchitecture des P lantes, CIRAD - analyse de l'architecture de la plante. - calibration par site à partir de mesures sur le terrain. - simulations -> maquettes (ensemble de cylindres). Apport:

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  1. Modèle d'architecture d'arbre: Atelier de Modélisation de l'Architecture des Plantes, CIRAD - analyse de l'architecture de la plante. - calibration par site à partir de mesures sur le terrain. - simulations -> maquettes (ensemble de cylindres). Apport: * Description détaillée des diffuseurs. * Prise en compte de la variabilité verticale. Âge (année)

  2. Interface AMAP/RT (AMAP2SAR) Inputs of the e.m models • Scatterers density (per layer) • Geometric description • Surface roughness • Moisture (ground, vegetation) • Acquisition parameters (f,p,i) EM MODELS (CESBIO) AMAP MODEL (Cirad) • Model outputs • backscatter values • scattering mechanisms • contribution of scatterers

  3. Good agreement Penetration depth seems to be of several meters Comparison RT-3D modelling and X-band HUTSCAT measurements

  4. Inversion into foliar biomass (LAI)Comparison for the 40-year old Austrian pine stand 18 16 14 12 10 Height above the ground (m) 8 6 4 In-situ LAI 2 Radar retrieved LAI 0 0 0.25 0.5 0.75 1 1.25 LAI (m²/m²)

  5. Ediff Einc exact position of scatterers, compute Distorted Born approximation applied to the modelling of forest scattering horizontal, homogeneous layers to compute (Foldy approximation)

  6. 2D vs 3D modelling for single pass interferometry 3D 2D Interferometric height Interferometric height Phase centre

  7. Height retrieval using single pass interferometry: 2D-3D Born approximation modelling X Band SRTM configuration C Band ERS-like configuration Lozere forest: Corsican pine

  8. Picard G., T. Le Toan, S. Quegan,(2004) « A Three-Dimensional Radiative Transfer Model applied to ranging scatterometer measurements from a pine forest » Waves in Random Media, 14 (2004), 317-331. Picard G., T. Le Toan, S. Quegan, Y. Cariglio, (2004). Radiative Transfer modeling of cross-polarised backscatter from a pine forest using the discrete ordinate and eigenvalue method », IEEE Transactions on Geoscience and Remote Sensing,Vol 42, no 8, pp1720-1730. Castel T., A. Beaudoin, N. Floury, T. Le Toan, Barczi J.F., and Caraglio Y., "Deriving Forest Parameters for Backscatter Models Using the AMAP Architectural Plant Model", IEEE Transactions on Geoscience and Remote Sensing, 2000. Martinez J.M., N. Floury, T. Le Toan, A. Beaudoin, M.T. Hallikainen, and M. Makynen." Measurements and modelling of vertical backscatter distribution in forest canopy", IEEE Transactions on Geoscience and Remote Sensing, vol. 38, no 2, 710-719, March 2000 Melon P., Martinez JM, T. Le Toan, L. Ulander, A. Beaudoin, "On the retrieving of Forest stem volume from VHF SAR data" , IEEE Transactions on Geoscience and Remote Sensing, November 2001.

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