IGARSS-2011-Vancouver Temporal decorrelation analysis at P-band over tropical forest Sandrine Daniel, Pascale Dubois-Fernandez, Aurlien Arnaubec, Sbastien Angelliaume IGARSS 2011, Vancouver IGARSS-2011-Vancouver Overview TropiSAR Campaign Temporal coherence Methodology Paracou Analysis Tomography Conclusion IGARSS-2011-Vancouver Translating objectives into flight scenario TropiSAR objectives Evaluate the BIOMASS mission concept over tropical forests Provide a dataset for algorithm validation Radiometric analysis Reference plots with range of biomass in the high values Up to 520 t/ha Temporal decorrelation analysis Identical trajectories flown on different dates (22 days) PolInSAR Vertically shifted trajectories (100ft and 50ft) Adequate altitude of ambiguity throughout the swath Tomography Six vertically shifted trajectories 0 ft, 50ft, 100ft, 150ft, 200ft, 250ft IGARSS-2011-Vancouver TropiSAR: the campaign the in-situ database CIRAD-EDB - based on permanent plots managed by Guyafor project - 28 plots 157 ha measured trees, diameter > 10cm - biomass ranging from 100t/ha to 500t + /ha the SAR database ONERA - 7 flights over 22 days the data analysis - CESBIO: radiometry polarimetry - ONERA: PolInSAR - IRD: Polarimetry - EDB-CIRAD: in-situ error +.. Under fundings from ESA, CNES and ONERA IGARSS-2011-Vancouver TropiSAR: the sites Paracou Arbocel Nouragues Rochambeau Kaw IGARSS-2011-Vancouver TropiSAR: the waveform ParameterP-BandL-Band Geometry Altitude [ft,m]13000/ 3962 Velocity [m/s]120 Waveform ModeFull-Polar Peak Power [W] Actual PRF [kHz]2.55 Sampling rate [MHz]500 Bandwith [MHz] Processed wave length [m] Processed Bandwidth [MHz] (B=125 MHz) (B=150 MHz) Relative bandwidth [%] 3111 Range Resolution [m] Azimut resolution [m] Range pixel spacing [m] Azimuth pixel spacing [m] Near Range [m]4350 Nb of pixels in range Incidence angle range [] IGARSS-2011-Vancouver Acquisition geometry IGARSS-2011-Vancouver TropiSAR: August 2009 TropiSAR DescriptionDate Vol 0Validation/calibration10-August Vol 1Standard12-August Vol 2Tomography Nouragues14-August Vol 3Standard17-August Vol 4Tomography Paracou24-August Vol 5Standard30-August Vol 6Standard01-Sept Temporal decorrelation analysis - PolInSAR Tomography - PolInSAR 22 days IGARSS-2011-Vancouver Database over Paracou Temporal Shift Vertical Shift Flight 0 Flight 1 Flight 2 Flight 3 Flight 4 Flight 5 Flight 6 IGARSS-2011-Vancouver TropiSAR: the temporal decorrelation kz IGARSS-2011-Vancouver Interferometric coherence wrt temporal baseline 2 days 14 days 4 days 7 days 20 days 22 days Presented at PolInSAR-2011 Objective: complete the temporal analysis with all possible combinations IGARSS-2011-Vancouver Available temporal baselines over Paracou IGARSS-2011-Vancouver Systematic methodology InSAR Coherence Temporal Coherence Noise decorrelation Temporal decorrelation Scattering decorrelation ? RVoG model Spectral shift Negligible in airborne context IGARSS-2011-Vancouver Systematic methodology InSAR Coherence Temporal Coherence Noise decorrelation Temporal decorrelation Scattering decorrelation ? Spectral shift Negligible in airborne context IGARSS-2011-Vancouver Temporal Coherence: Paracou Correct for SNR contribution Compute coherence histogram over Rois f Compute histogram peak for min >0.95 RGB Hh-Hv-Vv IGARSS-2011-Vancouver Paracou Analysis Temporal Coherence: Paracou RGB Hh-Hv-Vv SNR