Modèle d'architecture d'arbre:

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Presentation transcript:

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)

EM MODELS AMAP MODEL (Cirad) 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

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

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 0.25 0.5 0.75 1 1.25 LAI (m²/m²)

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

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

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

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.