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  1. 1. Extraction of Wide-ranging Crustal Movement Using ALOS/PALSAR ScanSAR Interferometry<br />July 26, 2011 IGARSS 2011 Vancouver, Canada<br />Masanori Miyawaki (NEC Aerospace Systems)<br />Shino Yamaguchi (NEC Aerospace Systems)<br />Tsunekazu Kimura (NEC)<br />
  2. 2. Page 2<br />© NEC Corporation 2011<br />Outline<br />1. Introduction<br />2. Comparison of stripmap-mode and ScanSAR-mode<br />3. Processing flow of ScanSAR-ScanSAR interferometry<br />4. Processing results of ScanSAR-ScanSAR interferometry<br />5. Conclusions<br />
  3. 3. Page 3<br />© NEC Corporation 2011<br />Introduction<br />Differential SAR interferometry is a very powerful tool to detect crustal movement. <br />Many excellent D-InSAR results are reported by ALOS/PALSAR stripmap-mode data.<br />In recent years, huge earthquakes have occurred with wide-ranging crustal movement over hundred of kilometers.<br />In such cases, the entire deformation area cannot be covered using stripmap-mode data.<br />ScanSAR has very wide swath. So, ScanSAR-ScanSAR interferometry is suitable for extraction of wide-ranging crustal movement caused by huge earthquake.<br />We tried ScanSAR-ScanSAR D-InSAR processing using a lot of pairs ALOS/PALSAR scanSAR mode data. <br />
  4. 4. Page 4<br />© NEC Corporation 2011<br />Comparison of Stripmap-mode and ScanSAR-mode (ALOS/PALSAR)<br />
  5. 5. Page 5<br />© NEC Corporation 2011<br />Example of Analysis result of Stripmap-mode data<br />Flight direction<br />Illuminated direction<br />2008 China Wenchuan Earthquake case<br />Analysis by GSI from ALOS raw data (c) JAXA, METI <br />(http://cais.gsi.go.jp/Research/topics/topic080604/index.html)<br />
  6. 6. Page 6<br />© NEC Corporation 2011<br />Comparison of Stripmap-mode and ScanSAR-mode (ALOS/PALSAR)<br />
  7. 7. Page 7<br />© NEC Corporation 2011<br />Burst Timing<br />Scan-2<br />Scan-1<br />Scan-3<br />Scan-4<br />Scan-5<br />Observation Geometry of ScanSAR-mode<br />Along-track direction<br />SAR<br />Burst Footprint<br />Swath<br />
  8. 8. Page 8<br />© NEC Corporation 2011<br />Burst Timing<br />Slave<br />Interference<br />No Interference<br />Master<br />Burstoverlaprate<br />100% 70% 30% 0% 0%<br />𝑅𝑜𝑣𝑒𝑟𝑙𝑎𝑝=𝜏𝑜𝑣𝑒𝑟𝑙𝑎𝑝𝜏𝑑𝑢𝑟𝑎𝑡𝑖𝑜𝑛×100<br />    𝑅𝑜𝑣𝑒𝑟𝑙𝑎𝑝   : Burst overlap rate [%]<br />    𝜏𝑜𝑣𝑒𝑟𝑙𝑎𝑝: Burst overlap time between master and slave<br />    𝜏𝑑𝑢𝑟𝑎𝑡𝑖𝑜𝑛: Burst duration time<br /> <br />
  9. 9. Page 9<br />© NEC Corporation 2011<br />Processing flow of ScanSAR-ScanSAR interferometry<br />Processing at each scan data<br />Differential interferogram<br />of each scan<br />DEM &<br />Orbit information<br />SLAVE<br />Interferometry<br />Removal of<br /> topographic fringe <br />and orbital fringe<br />SAR image processing<br />Registration<br />Mosaic<br />MASTER<br />SAR image processing<br />Map projection<br />
  10. 10. Page 10<br />© NEC Corporation 2011<br />Processed data (2008 China Wenchuan Earthquake Case)<br />
  11. 11. Page 11<br />© NEC Corporation 2011<br />Processing Result ( 2008 China Wenchuan Earthquake)<br />
  12. 12. Page 12<br />© NEC Corporation 2011<br />Processed data (2010 Chile Earthquake Case)<br />
  13. 13. Page 13<br />© NEC Corporation 2011<br />Processing Result ( 2010 Chile Earthquake)<br />
  14. 14. Page 14<br />© NEC Corporation 2011<br />The differential fringe and burst overlap rate<br />Azimuth<br />Range<br />PRF change<br />(slave data)<br />Burst Overlap Rate[%]<br />PRF change<br />(master data)<br />
  15. 15. Page 15<br />© NEC Corporation 2011<br />Processed data (2011 Japan Tohoku Earthquake Case)<br />
  16. 16. Page 16<br />© NEC Corporation 2011<br />Preliminary Result ( 2011 Japan Tohoku Earthquake)<br />Stripmap-mode D-InSAR fringe (analyzed by JAXA)<br />ScanSAR D-InSAR fringe<br />
  17. 17. Page 17<br />© NEC Corporation 2011<br />The conditions for ScanSAR-ScanSAR interferometry<br />2008 China Wenchuan<br />2010 Chile<br />2011 Japan Tohoku<br />
  18. 18. Page 18<br />© NEC Corporation 2011<br />Conclusions<br />We tried to detect the crustal movement deformation by ScanSAR-ScanSAR interferometry processing using the ALOS/PALSAR data.<br />We could get good interferograms without the phase discontinuity between scans. (2008 China Wenchuan Earthquake, 2010 Chile Earthquake)<br />It was confirmed to be able to detect crustal movement by ScanSAR-ScanSAR interferometry analysis.<br />It was shown that the ScanSAR-ScanSAR interferometry can be a very powerful tool of wide-ranging crustal movement analysis.<br />To utilize ScanSAR-ScanSAR Interferometry more effective, interferometric baseline and burst timing ought to be controlled.<br />
  19. 19. Page 19<br />© NEC Corporation 2011<br />Acknowledgement<br />In this study, PALSAR Level 1.0 data are provided from Earthquake Working Group under a cooperative research contract with JAXA.<br />The ownership of PALSAR data belongs to METI and JAXA.<br />We greatly appreciate supports by these groups.<br />
  20. 20. Page 20<br />© NEC Corporation 2011<br />