TU1.L09.3	 - Fully Polarimetric TerraSAR-X Data: Data Quality and Scientific Analysis
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TU1.L09.3 - Fully Polarimetric TerraSAR-X Data: Data Quality and Scientific Analysis

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TU1.L09.3	 - Fully Polarimetric TerraSAR-X Data: Data Quality and Scientific Analysis TU1.L09.3 - Fully Polarimetric TerraSAR-X Data: Data Quality and Scientific Analysis Presentation Transcript

  • Fully Polarimetric TerraSAR-X Data: Data Quality and Scientific Analysis Irena Hajnsek 1/2 , Kostas Papathanassiou 1 , Thomas Busche 1 , Thomas Jagdhuber 1 , JunSu Kim 1 , Maria Sanjuan Ferrer 1 , Stefan Sauer 1 , Michelangelo Villano 1 1 Microwaves and Radar Institute & ²Institute of Environmental Engineering, ETH Zurich
  • TerraSAR-X: DRA Mode Campaign
    • Announcement of Opportunity:
      • DRA Mode data available: simplified proposal procedure and free of charge !
      • Defined test site (over selected areas): 356 Data takes
    • Campaign duration: 3 cycles (33 days - April 11 and May 13, 2010)
    • StripMap mode (15 km swath width, 3 m resolution)
    •  
    http://sss.terrasar-x.dlr.de
  • Selected Test Sites
    • At least 42 test sites with 3 repeat cycles (repeat pass Pol-InSAR)
    Europe
  • North America
  • Arctic Sea
    • Principle
    • Transmit: the full antenna is used
    • Receive: the antenna is ‚electrically‘ divided into two sections in azimuth direction (two independent receive channels are available)
    • TS-X Experimental Modes
    • Along-Track Interferometry (ATI)
    • Quad Polarisation
    Transmit Receive Dual Receive Antenna Mode (DRA Mode) RX2 RX1 V H HH V H HH CH1 H H H H RX1 VV H V VV H V CH2 V V V V RX2 V H V H TX Polarisation Mode
  • TerraSAR-X Calibration Results 0.39 dB 0.18 dB 0.15 dB (2 years) < ±0.2 dB no measurements no measurements < ±0.2 dB 0.31 m 0.54 m < 0.001° < 0.004° 0.38 dB / 0.49 dB 5.1° / 2.4° 80 sec DT length < 0.05 dB < 0.9° Re-Calibration (2009) Radiometric Calibration Antenna Model Verification Geometric Calibration Antenna Pointing Knowledge T/R Module Characterisation Internal Calibration 0.6 dB 1.1 dB Absolute Radiometric Accuracy 0.31 dB 0.68 dB Relative Radiometric Accuracy 0.2 dB (after launch) 0.87 dB Radiometric Stability < ±0.2 dB < ±0.1 dB ±0.2 dB ±0.1 dB
    • Beam-to-Beam Offset
    • two-way over rain forest
    • one-way over ground receiver
    < ±0.1 dB ±0.1 dB Azimuth Pattern Accuracy (one-way) < ±0.2 dB ±0.2 dB Elevation Pattern Accuracy (two-way) 0.30 m 0.53 m 2 m 2 m
    • Pixel Localisation Accuracy
    • Range
    • Azimuth
    < 0.002° 0.002° Azimuth < 0.006° 0.015° Elevation 0.38 dB / 0.56 dB 5.3° / 2.6° - -
    • Individual TRM Setting (1- σ ) :
    • Amplitude (Tx / Rx)
    • Phase (Tx / Rx)
    < 0.05 dB < 0.7° 0.05 dB 0.7°
    • Temp Freeze
    • Amplitude
    • Phase
    Status Commissioning Phase (2007) Goal
  • System and Propagation Distortion Model X-Talk: On Receive: and On Transmit: and Tx Channel Imbalance: Rx Channel Imbalance: Rx Distortion Tx Distortion Scatterer Propagation Propagation Add. Noise
  • 2 nd Order Descriptors: Polarimetric Coherences: Valid for Reflexion Symmetric Scatterers
  • Rx/Tx Distortion Matrices
  • Agricultural Test Site: Wallerfing (Germany)
    • Acquisition dates:
      • 14 April 2010
      • 25 April 2010
      • 06 May 2010
  • 14/04/2010 25/04/2010 06/05/2010 Subset of Wallerfing for 3 Different Dates @ Pauli RGB
  • Cross-Pol Ratios HV/VH 14/04/2010 25/04/2010 06/05/2010
  • 14/04/2010 25/04/2010 06/05/2010 Polarimetric Coherence Histograms (Amplitude) hhvv hvvh hhhv vvvh hhvv hvvh hhhv vvvh hhvv hvvh hhhv vvvh Polarimetric Coherences (Amplitude)
  • 14/04/2010 25/04/2010 06/05/2010 Polarimetric Coherence Histograms (Phase) hhvv hvvh hhhv vvvh hhvv hvvh hhhv vvvh hhvv hvvh hhhv vvvh Polarimetric Coherences (Phase)
  • SNR Estimation: Reciprocity: SNR Estimates from HVVH Coherence
  • SNR Estimates from hvvh Coherence 14/04/2010 25/04/2010 06/05/2010
  • Polarimetric SAR for Different Applications: Examples
    • Wallerfing (Agriculture)
    • Change of polarimetric feature depending on crop phenology
    • Repeat pass Pol-InSAR coherence analysis
    • San Francisco (Urban Area)
    • Urban area application for feature separation and interpretation
    • Argentiere & Aletsch (Glaciers)
    • Coherent Scatterer detection
    • Ward Hunt Ice Shelf (Sea Ice)
    • Change of sea ice feature
  • 14/04/2010 25/04/2010 06/05/2010 Polarimetric Ratios HH/VV @ X-band 49.1% 39.0% 51.4% VV>HH 17.8% 37.9% 44.2% VV>HH Sugar Beet Winter Wheat Dates HH>VV HH>VV 48,6% 55.8% 14/04/2010 61.0% 62.1% 25/04/2010 50.9% 82.2% 06/05/2010
  • Entropy/Alpha Angle @ X-band 14/04/2010 - Entropy 25/04/2010 - Entropy 06/05/2010 - Entropy Entropy/Alpha Entropy/Alpha Entropy/Alpha
  • Interferometric Coherences @ Different Polarisations April 25 th - May, 6 th April 14 th - May, 6 th April 14 th - April, 25 th |  HV12 | |S HV1 | ||S HV1 |-|S HV2 || |  VV12 | |S VV1 | ||S VV1 |-|S VV2 || |  HH12 | |S HH1 | ||S HH1 |-|S HH2 ||
  • San Francisco (11/04/2010)
  • range |HH+VV| |HH-VV| |HV| Double-bounce Single-bounce Triple-bounce Alpha_1 0 Double-bounce Single- bounce Triple-bounce Polarimetric TSX Image of the Golden Gate Bridge
  • Alpha_1 0 Double-bounce Single-bounce Triple-bounce Double- bounce Polarimetric TSX Image of the Golden Gate Bridge
  • Coherent Scatterers (CSs) Detection
    • Method: Phase Variance Approach
      • Based on the deterministic phase pattern across the spectrum characteristic of the CSs.
      • It allows a widely preservation of the spatial resolution in the CSs detection .
    • Common detection: Only the CSs that have a phase derivative variance σ ² lower than a given threshold in both directions (range and azimuth) are considered as detected CSs.
      • 10 sublooks of 60 MHz each out of the 150 MHz range bandwidth are formed and the variance σ ² of the phase derivative for every pixel is estimated.
      • 10 sublooks of 552 Hz each out of the 1380 Hz azimuth bandwidth and the variance of the phase derivative for every pixel is estimated.
      • Fixing a threshold ( σ ² ), pixels with a phase derivative variance lower than the threshold in range and azimuth at the same time will be considered as a detected CSs.
  • CSs Detection on the Argentiere Glacier (France) CR
  • CR CR σ ²=0.0025 rad ² σ ²=0.0064 rad ² σ ²=0.0144 rad ² CR IM (13-04-10) Argentiere Glacier (France): Coherent Scatterer Detection
  • IM1 (13-04-10) IM2 (24-04-10) IM3 (05-05-10) σ ²=0.0081 rad ² Aletsch Glacier (Switzerland): Coherent Scatterer Detection
  • Pauli RGB Composites Ice Shelf Land Fast Ice Pack Ice Ward Hunt Ice Shelf RadarSAT-2 Blue line 2001 Red line 2008 Eastern Ward Hunt ice shelf showing long (up to 15 km) meltwater lakes that form every summer on the ice surface. -ää (http://madzu.com/ellesmere/Ward_Hunt.html) 2010/04/13 2010/04/24 2010/05/05
  • and and = H and V Symmetry Rx and Tx Symmetry Reciprocity
  • SNR Estimates from 2D eigenvalue matrix 14/04/2010 25/04/2010 06/05/2010
  • CSs Detection on the San Francisco Scene (USA) σ ²=0.0025 rad ² σ ²=0.0064 rad ² σ ²=0.0144 rad ²