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. 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

3. 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

4. Inversion into foliar biomass (LAI) Comparison for the 40-year old Austrian pine stand18 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)

5. 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

6. 2D vs 3D modelling for single pass interferometry
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),
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, pp
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, , 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.