Fully Polarimetric TerraSAR-X Data:  Data Quality and Scientific Analysis  Irena Hajnsek 1/2 , Kostas Papathanassiou 1 , T...
TerraSAR-X: DRA Mode Campaign <ul><li>Announcement of Opportunity:  </li></ul><ul><ul><li>DRA Mode data available: simplif...
Selected Test Sites <ul><li>At least 42 test sites with 3 repeat cycles (repeat pass Pol-InSAR) </li></ul>Europe
North America
Arctic Sea
<ul><li>Principle </li></ul><ul><li>Transmit:  the full antenna is used </li></ul><ul><li>Receive:  the antenna is ‚electr...
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 ...
System and Propagation Distortion Model X-Talk: On Receive:  and On  Transmit:  and Tx Channel Imbalance: Rx Channel Imbal...
2 nd  Order Descriptors: Polarimetric Coherences: Valid for Reflexion Symmetric Scatterers
Rx/Tx Distortion Matrices
Agricultural Test Site: Wallerfing (Germany) <ul><li>Acquisition dates:  </li></ul><ul><ul><li>14 April 2010 </li></ul></u...
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 hhv...
14/04/2010 25/04/2010 06/05/2010 Polarimetric Coherence Histograms (Phase) hhvv hvvh hhhv vvvh hhvv hvvh hhhv vvvh hhvv hv...
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 <ul><li>Wallerfing (Agriculture) </li></ul><ul><li>Change of polarim...
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 ...
Entropy/Alpha Angle @ X-band 14/04/2010 - Entropy 25/04/2010 - Entropy 06/05/2010 - Entropy Entropy/Alpha Entropy/Alpha En...
Interferometric Coherences @ Different Polarisations April 25 th  - May, 6 th April 14 th  - May, 6 th April 14 th  - Apri...
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-bou...
Alpha_1 0 Double-bounce Single-bounce Triple-bounce Double- bounce Polarimetric TSX Image of the Golden Gate Bridge
Coherent Scatterers (CSs) Detection <ul><li>Method:   Phase Variance Approach </li></ul><ul><ul><li>Based on the determini...
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 ...
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...
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
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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

  1. 1. 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
  2. 2. TerraSAR-X: DRA Mode Campaign <ul><li>Announcement of Opportunity: </li></ul><ul><ul><li>DRA Mode data available: simplified proposal procedure and free of charge ! </li></ul></ul><ul><ul><li>Defined test site (over selected areas): 356 Data takes </li></ul></ul><ul><li>Campaign duration: 3 cycles (33 days - April 11 and May 13, 2010) </li></ul><ul><li>StripMap mode (15 km swath width, 3 m resolution) </li></ul><ul><li>  </li></ul>http://sss.terrasar-x.dlr.de
  3. 3. Selected Test Sites <ul><li>At least 42 test sites with 3 repeat cycles (repeat pass Pol-InSAR) </li></ul>Europe
  4. 4. North America
  5. 5. Arctic Sea
  6. 6. <ul><li>Principle </li></ul><ul><li>Transmit: the full antenna is used </li></ul><ul><li>Receive: the antenna is ‚electrically‘ divided into two sections in azimuth direction (two independent receive channels are available) </li></ul><ul><li>TS-X Experimental Modes </li></ul><ul><li>Along-Track Interferometry (ATI) </li></ul><ul><li>Quad Polarisation </li></ul>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
  7. 7. 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 <ul><li>Beam-to-Beam Offset </li></ul><ul><li>two-way over rain forest </li></ul><ul><li>one-way over ground receiver </li></ul>< ±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 <ul><li>Pixel Localisation Accuracy </li></ul><ul><li>Range </li></ul><ul><li>Azimuth </li></ul>< 0.002° 0.002° Azimuth < 0.006° 0.015° Elevation 0.38 dB / 0.56 dB 5.3° / 2.6° - - <ul><li>Individual TRM Setting (1- σ ) : </li></ul><ul><li>Amplitude (Tx / Rx) </li></ul><ul><li>Phase (Tx / Rx) </li></ul>< 0.05 dB < 0.7° 0.05 dB 0.7° <ul><li>Temp Freeze </li></ul><ul><li>Amplitude </li></ul><ul><li>Phase </li></ul>Status Commissioning Phase (2007) Goal
  8. 8. 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
  9. 9. 2 nd Order Descriptors: Polarimetric Coherences: Valid for Reflexion Symmetric Scatterers
  10. 10. Rx/Tx Distortion Matrices
  11. 11. Agricultural Test Site: Wallerfing (Germany) <ul><li>Acquisition dates: </li></ul><ul><ul><li>14 April 2010 </li></ul></ul><ul><ul><li>25 April 2010 </li></ul></ul><ul><ul><li>06 May 2010 </li></ul></ul>
  12. 12. 14/04/2010 25/04/2010 06/05/2010 Subset of Wallerfing for 3 Different Dates @ Pauli RGB
  13. 13. Cross-Pol Ratios HV/VH 14/04/2010 25/04/2010 06/05/2010
  14. 14. 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)
  15. 15. 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)
  16. 16. SNR Estimation: Reciprocity: SNR Estimates from HVVH Coherence
  17. 17. SNR Estimates from hvvh Coherence 14/04/2010 25/04/2010 06/05/2010
  18. 18. Polarimetric SAR for Different Applications: Examples <ul><li>Wallerfing (Agriculture) </li></ul><ul><li>Change of polarimetric feature depending on crop phenology </li></ul><ul><li>Repeat pass Pol-InSAR coherence analysis </li></ul><ul><li>San Francisco (Urban Area) </li></ul><ul><li>Urban area application for feature separation and interpretation </li></ul><ul><li>Argentiere & Aletsch (Glaciers) </li></ul><ul><li>Coherent Scatterer detection </li></ul><ul><li>Ward Hunt Ice Shelf (Sea Ice) </li></ul><ul><li>Change of sea ice feature </li></ul>
  19. 19. 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
  20. 20. Entropy/Alpha Angle @ X-band 14/04/2010 - Entropy 25/04/2010 - Entropy 06/05/2010 - Entropy Entropy/Alpha Entropy/Alpha Entropy/Alpha
  21. 21. 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 ||
  22. 22. San Francisco (11/04/2010)
  23. 23. 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
  24. 24. Alpha_1 0 Double-bounce Single-bounce Triple-bounce Double- bounce Polarimetric TSX Image of the Golden Gate Bridge
  25. 25. Coherent Scatterers (CSs) Detection <ul><li>Method: Phase Variance Approach </li></ul><ul><ul><li>Based on the deterministic phase pattern across the spectrum characteristic of the CSs. </li></ul></ul><ul><ul><li>It allows a widely preservation of the spatial resolution in the CSs detection . </li></ul></ul><ul><li>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. </li></ul><ul><ul><li>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. </li></ul></ul><ul><ul><li>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. </li></ul></ul><ul><ul><li>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. </li></ul></ul>
  26. 26. CSs Detection on the Argentiere Glacier (France) CR
  27. 27. 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
  28. 28. IM1 (13-04-10) IM2 (24-04-10) IM3 (05-05-10) σ ²=0.0081 rad ² Aletsch Glacier (Switzerland): Coherent Scatterer Detection
  29. 29. 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
  30. 30. and and = H and V Symmetry Rx and Tx Symmetry Reciprocity
  31. 31. SNR Estimates from 2D eigenvalue matrix 14/04/2010 25/04/2010 06/05/2010
  32. 32. 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

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