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Forest Parameter Estimation using Polarimetric SAR Interferometry

Forest Parameter Estimation using Polarimetric SAR Interferometry. K. P. Papathanassiou German Aerospace Establishment Institute for Radio Frequency Technology and Radar Systems Oberpfaffenhofen, P.O. 11 16, D-82234 Wessling, Germany Tel./Fax.: ++49-(0)8153-28-2367/1149

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Forest Parameter Estimation using Polarimetric SAR Interferometry

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  1. Forest Parameter Estimation using Polarimetric SAR Interferometry K. P. Papathanassiou German Aerospace Establishment Institute for Radio Frequency Technology and Radar Systems Oberpfaffenhofen, P.O. 11 16, D-82234 Wessling, Germany Tel./Fax.: ++49-(0)8153-28-2367/1149 Email: kostas.papathanassiou@dlr.de

  2. Backscattering Coefficient vs. Interferometric Coherence L-band: HV Channel L-band: Interferometric Coherence RGB

  3. Conclusion 1 Interferometric observables are significantly more sensitive to forest structure and are therefore required for accurate above ground forest biomass estimation

  4. Forest Height and Biomass Estimation Conventional Biomass Estimation based on Backscatter Saturation: Biomass Saturation Limit % of Earths Vegetated Area % of Total Biomass Stock [T/ha] [Kg/(m^2)] 4% 8% 20% 80% 20 40 100 250 350 2 4 10 25 35 25% 35% 60% 75% C-band L-band P-band Tree Height and Underlying Topography + Forest Structure + (Species) Biomass Estimators based on SBPI or MBPI: M. L. Imhoff, “Radar Backscatter and Biomass Saturation: Ramifications for Global Biomass Inventoty ”,IEEE TGARS, Vol. 33, No. 2, March 1995

  5. Tree Height Estimation E-SAR / Test Site: Oberpfafenhoffen SAR Image HH SAR Image / HV IR Image

  6. Interferometric Aproaches for Tree Height Estimation Required tree height estimation accuracy: 5-10% Mean forest height on Earth: 20m -> Height Accuracy: 1-2m Single Baseline Dual Frequency Interferometry (X- and P-band): Underestimated tree height estimates or ill-conditioned inversion problem + Limitation due to temporal decorrelation in repeat-pass implementation Single-Baseline Polarimetric Interferometry (L- or P-band): Estimation of tree heights and ground topography within the required range + Temporal decorrelation is not so severe at lower frequencies Multi-Baseline Polarimetric Interferometry (L- or P-band) Additional to tree height and ground topography also forest structure estimation + Compensation of temporal decorrelation with inversion algorithms

  7. Conclusion 2 Coherent fully polarimetric systems are the best option for accurate above ground forest biomass estimation

  8. Which is the optimum frequency band ??? C-band Pro: Established Technology Contra: Penetration Capability Temporal Decorrelation L-band Pro: Established Technology Penetration Capability Wide Spectrum of Applications Contra: Long Term Temporal Decorrelation Open Question: Does L-band see the ground in tropical forest??? P-band Pro: Penetration Capability in Tropical Forest Contra: Spatial Resolution Non-Established Technology Limited Application Spectrum

  9. JERS-I L-Band SAR Mosaic of River Amazon 1995 L-band JERS-I / Test Site: Amazon Basin, Brasil af1203 cf0402 Courtesy of NASDA

  10. Radar illuminator (€ € €) e.g. ALOS, TerraSAR, Radarsat II Receive-only micro satellites (€) e.g. “CartWheel” configuration Spaceborne Bistatic Scenario: CartWeel Configuration

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