Dr. Ridha Touzi, Eng., Ph.D., Habil., IEEE Fellow

Image Touzi, Ridha
Senior Research Scientist

Remote Sensing Scientist with activities focussed on the calibartion of polarimetric Canadian & international  satellite SAR missions, development of advanced methods for optimum polarimetric information extraction, and promotion of the added value of polarimetric SAR in support of governement priorities. 

Current research and/or projects

Objective: Investigation and promotion of the key information provided by  satellilte equipped with polarimetric Synthetic Aperture Radar (SAR) in support of systematic & cost effective monitoring of peatland & permafrost change and related impact on infrastructures and surrounding environment. This includes various aspects of polarimetric SAR; SAR design& calibration, development of advanced methods for optimum polarimetric-interferometric  SAR information extraction, and their validation for systematic monitoring of peatland & permafrost transformations, and monitoring the impact of accelerated climate change permafrost thawing  on infrastructures (roads and pipelines) and surrounding environment

Current Research conducted under the following activities:

1. Polarimetric SAR Calibration;  Assessment and calibration of RCM Compact SAR, jointly with CSA, for the extraction of reliable information in support of governement decision making. 

2. Investigation of the added value of polarimetric-interferometric  multi-frequency satellilte SAR for operational peatland & permafrost mapping, and monitoring the impact of their transformation on surrounding infrastructures (roads and piplines). This work has been conducted jointly with our partners (Alberta Energy Regulator & Geology Survey, NWT)  under the CCMEO-CCRS program Earth Observation for Climate Effects. 

New innovative methods have been developed and validated for optimum extraction of polarimetric-interferometric multi-frequency (C-band RCM & Radarsat2, L-band ALOS4&NISAR and P-band AIRMOSS & Biomass) SAR information in support of permafrost mapping, and monitoring the impact of permafrost degradation on infrastructure (transportation (road) and energy (pipeline)) and surrounding environment.

Research and/or project statements

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  1. RCM Compact SAR calibration (2016-2024): This project initiated by Dr. Touzi in 2016 has been financed by  CSA (from 2016 to March 2023), under the EOADP Program: New innovative methods have been developed and validated, jointly with CSA and AAFC, for RCM Compact calibration. Recently, the new Touzi calibration method has been adopted by CSA and the implementation of the corresponding codes in EODM has been supported by CSA for the operational calibration of  the three satellites of the Radarsat Constellation Mission (RCM). Thanks to Dr. Touzi's innovative calibration method, RCM would be the first satellite SAR mission that would permit the use of calibrated Compact images for the extraction of reliable information in support of GoV decision making.
  1. Investigation of polarimetric-interferometric  multi-frequency satellite SAR for operational peatland & permafrost mapping, and monitoring the impact of their transformation on surrounding infrastructures (roads and pipelines), 2020-2026. This work has been conducted jointly with our partners (Alberta Energy Regulator & Geology Survey, NWT)  under the CCMEO-CCRS program Earth Observation for Climate Effects. New innovative methods have been developed and validated (jointly with our partners) for optimum extraction of polarimetric-interferometric (PolinSAR) multi-frequency (C-band RCM, L-band ALOS4&NISAR and P-band AIRMOSS & Biomass) SAR information in support of permafrost mapping, and monitoring the impact of permafrost degradation on infrastructure (transportation (road) and energy (pipeline)) and surrounding environment
  1. Towards  Systematic Monitoring of Permafrost Degradation in Infrastructure Corridor and Surrounding Environment (2018-2020): Project l granted  and supported by CSA under the GRIP Program. This project led to the development and validation of innovative methods for discontinuous permafrost mapping & monitoring in the oil sand exploration region.
  1. Polarimetric SAR for Peatland Mapping and Monitoring in the Athabasca Oil Sand  Region, (2013-1016): Activity  financed by CSA  under the CCRS division project “Enabling Responsible Resource Development (RRD) through Earth Observation” . This project led to the development of innovative methods (licenced to the Canadian industry in the context of the Gov technology transfer) for enhanced peatland and mapping & monitoring using polarimetric RAdarsat2 and ALOS.
  1. Polarimetric Interferometric SAR information for peatland and man-made target characterization (2010-2013; Project granted and supported by CSA under the GRIP program. This project led to the development of innovative methods (licenced to the Canadian industry) for enhanced wetland mapping & monitoring using polarimetric RAdarsat2.
  1. Man-Made Target Characterization Using Polarimetric and Pol-In SAR information (2007-10): Project granted and supported by CSA and DRDC.  This project, which was extended for 3 additional years, led to the development & validation of innovative methods for enhanced ship detection and classification using polarimetric Radarsat2.
  1. Calibration-Validation of Polarimetric RADARSAT2 (2007-12); This project, which was  partially financed by CSA for 5 years, led to the calibration of polarimetric Radarsat2 .

Education and awards

International Awards and Honors

Institute of Electrical and Electronics Engineers (IEEE

Récipient du Prix le Plus Prestigieux de l’Institute of Electrical and Electronics Engineers (IEEE),

  • IEEE Fellow : Ce prix a été crée par IEEE en 1912 pour reconnaître l’extraordinaire contribution qu’un chercheur aurait emmené à un domaine des IEEE (https://www.ieee.org/membership/fellows/index.html).
  • L’auteur est le 2eme Scientifique  du  Centre Canadien en Télédétection (CCRS) qui a eu cette grande reconnaissance.  Depuis la fondation du  (CCRS) en 1975, seuls Dr. Keith Raney du CCRS (en 1991) et Dr. Touzi (2015) ont eu cette grande reconnaissance internationale.
  • Recipient of the  1999 IEEE Geoscience and Remote Sensing Transactions Best Paper Award for a very significant contribution to the IEEE field of endeavour with paper entitled  “Coherence Estimation for SAR imagery”, IEEE TGRS, January 1999.

Honour European Space Agency (ESA)

Honour Japan Space Agency (JAXA)

  • Letter from the Director of Earth Observation Research Center (EORC) and the Manager of ALOS mission that thanks CCRS and acknowledge the “Significant contribution of Dr. R. Touzi to the design and calibration of ALOS PALSAR synthetic aperture radar”.  29 February 2009.

National Awards and Honors:

NRCan Awards:

  • Recipient of the Departmental Achievement Award (DAA) for “the outstanding contribution to the project: Science Innovation - RADARSAT Constellation Mission. 3 Dec  2020.         
  • Recipient of the 2018- Earth Science Sector Award for  the significant  contribution to the  Radarsat Constellation Mission (RCM)          
  • Recipient of the 2013- Earth Science Sector Award for “The significant contribution the design  and calibration of Canadian and International satellite polarimetric synthetic aperture radar (SAR)    missions”. With the statements: “Through his innovative analysis, Dr. Touzi had significant impact on the design  and calibration of the $500M Canadian satellite RADARSAT-2 (RS2), the calibration of the   Japanese ALOS SAR satellite and the design of the RADARSAT Constellation Mission.  His  contributions have directly improved the utility of SAR data by Canadian and international users”.
  • Recipient of the 2011- Earth Science Sector Award for the “The significant contribution to the Success of the RADARSAT Constellation Mission”.  With the statement: “Scientist Ridha Touzi has participated in this team and has had significant impact on the future quality of RCM data.  In particular, through his own initiative, Dr. Touzi led an investigation into the antennae isolation requirements for the RCM. Suspecting that the CSA and industry specification in the preliminary design was inadequate, Dr. Touzi led an investigation that proved tighter specifications were needed to meet RCM user needs. If not adopted, it was shown that some user requirements could be negatively affected and would not be met.  Through the GOC’s RCM User and Science Team, the recommendations were made and the CSA and MDA (the contractor) incorporated the mission change.
  • Recipient of the 2004-Natural Resources Canada-Department-Award for thesignificant contribution to polarimetric SAR in Canada and at the International level, and in particular to the preparation of the Canadian satellite RADARSAT-2 mission”, October 2004:

       With the statement “Dr. Touzi developed advanced methods for polarimetric data analysis. He has also developed and implemented a user-friendly Polarimetric Workstation (PWS) that has been successfully licensed to more than 30 other government departments, universities, and industry performers. Dr. R. Touzi is making key contributions to Canada’s preparation of the Radarsat-2 Synthetic Aperture Radar by developing appropriate data calibrations methods, and by influencing the Radarsat-2 antenna design to ensure the advanced data will be accessible to the user community”.  

Honor:

  • GoV representative in a TV documentary on Radarsat2, TéléQuébec, Oct. 2008.

In recognition of R. Touzi’s role in the promotion of Radarsat 2 polarimetric Applications,  TéléQuébec TV channel has invited R. Touzi to contribute as a keynote speaker with a 5 mn demonstration of polarimetric Radarsat2 applications to a Report on the Canadian Satellite Radarsat2. The report was broadcasted as a part of Le Code Chastenay programme. The TV 10mn report has first presented the Radarsat2 design and launch in collaboration with MDA. A 5 mn was then dedicated to R. Touzi and his team in the Mer Bleue RAMSAR wetland, to talk about the promising potential of Radarsat2 polarimetry for mapping peatlands and monitoring their transformations related to climate change. The report was broadcasted four times during the week of October 28th; Monday the 28th of October at 20:00, Wednesday the 29th of October at 23:00, Thursday the 30th of October at 13:00, and Saturday 1st of November at 17:00

International experience and/or work

International

  • IEEE TGRS associate Editor since 2018.
  • Permanent member of the international polarimetry Committee US-Navy ONR-NICOP-WIPSS: Wideband Interferometric and Polarimetric Surveillance and Sensing Research Interaction program since 2006.
  • Member of the IEEE Committee on Earth Observation Satellites (CEOS) Calibration & Validation http://ceos.org/ourwork/workinggroups/wgcv/
  • NASA: Guest Member of NISAR Calibration group since 2024.
  • JAXA: Guest Member of ALOS, ALOS2 and ALOS4 Cal-Val group since 2004
  • ESA: Guest Member of ESA Sentinel-1 Calibration-Validation team of the European satellite Sentinel-1 (2014-2016)
  • DLR: Guest Member of the DLR TerraSAR  Calibration-Validation team (2012-14)

Canada:

  • Guest Member of the RCM GoV Working Group on Data Quality  since 2018
  • Guest Member of the RADARSAT2 GoV Working Group on Data Quality  (2004-2019)
  • Guest Member of the RADARSAT2 & RCM Application Working Group since 2004

Key publications

  1. R. Touzi, S. Pawley, P. Wilson, X. Jiao, M. Hosseini, and M. Shimada. Polarimetric L-Band ALOS2-PALSAR2 for Discontinuous Permafrost Mapping in Peatland Regions. Remote Sensing, Special issue on SAR Interferometry and Polarimetry Applications, Vol. 15, No. 9: 2312, April 2023. https://doi.org/10.3390/rs15092312.
  2. R. Touzi, M. Shimada, and T. Motohka, “Calibration and Validation of Polarimetric ALOS2”, Rem. Sens., Special issue on ALOS2 Calibration, Vol. 14, Num. 2452, pp. 1-13, May 2022,  https://doi.org/10.3390/rs14102452
  3. Zhang, Y., R. Touzi, W. Feng, G. Hong, T.C. Lantz and S.V. Kokelj, “Landscape-scale variations  in near-surface soil temperature and active-layer thickness: Implications for high-resolution permafrost mapping”, Permafrost and Periglacial Processes Journal, aug. 2021.
  4. R. Touzi, M. Shimada, T. Motohka, and S. Nedelcu, “Assessment of PALSAR2 Compact non circularity  using the Amazonian rainforests”, IEEE TGRS, Vol. 58, Num. 10, pp. 7472-7482, Oct. 2020
  5. R. Touzi, G. Gosselin, and R. Brook. Subarctic Peatland Characterization and Monitoring, Section3.5. In Polarimetric Synthetic Aperture Radar: Principles and Applications, pages 160– 168. Editors I. Hajnsek and Y. L. Desnos, Springer,

open-access, https://www.springer.com/de/book/9783030565022, 2021

  1. R. Touzi, G. Gosselin, and R. Brooks, “Peatland subsurface water flow monitoring using  polarimetric L-band”, ESA Book on Principles and Applications of Pol-InSAR, Springer,  https://www.springer.com/gp/book/9783030565022, open-access ESA website, 2021
  2. R. Touzi, K. Omari, B. Sleep, and X. Jiao, “Scattered and received wave polarization optimization for enhanced peatland classification and fire damage assessment using polarimetric PALSAR”, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing , Vol. 11, No. 11, pp 4452-4477, Nov. 2018.
  3. R. Touzi and P.W. Vachon, “RCM Polarimetric SAR for Enhanced Ship Detection and Classification”, CJRS, Vol. 41, No. 5, pp 473-484, Feb. 2016
  4. R. Touzi, J. Hurley, and P.W. Vachon, “Optimization of The Degree of Polarization for Enhanced Ship detection using Polarimetric RADARSAT-2”, IEEE TGRS, Vol. 53, No. 10, pp. 5403-5424, Oct. 2015
  5. G. Gosselin, R. Touzi, and F. Cavaillas, “Polarimetric Radarsat2 wetland classification using the Touzi decomposition: Case of the Lac St Pierre RAMSAR Wetland”, CJRS, Vol. 36, No. 6, pp. 1-16, 2013.
  6. R. Touzi, R.K. Hawkins and S. Cote, “R. Touzi , R.K. Hawkins and  S. Coté,  “On the Use of Transponder for High Precision Assessment & Calibration of Polarimetric Radarsat-2”, IEEE TGRS, Vol. 51, No. 1, pp. 487-503, January 2013
  7. K. Li, B. Brisco , Y. Shao and R. Touzi, “Polarimetric decomposition with Radarsat2 for rice mapping and monitoring”, CJRS, Vol. 38, No. 2, pp. 169-179, 2012
  8. A. Bhattacharya and R. Touzi “Polarimetric SAR Urban Classification using  the Touzi Decomposition”,   Can. J. Remote Sensing, Vol. 37, No. 4, pp. 323_332,  April 2011
  9. R. Touzi, P.W. Vachon and J. Wolfe, “Requirement on antenna isolation for operational use of   future C-band SAR Constellations missions in maritime surveillance ”, IEEE GRSL, Sep. 2010
  10. Touzi R., and M. Shimada, “Calibration of Polarimetric PALSAR”, IEEE TGRS, ,ALOS special issue, Vol. 47, No.12,  Dec. 2009.
  11. M. Shimada, R. Touzi, and T. Tadono, Forewords to the Special Issue on Calibration and Validation of ALOS Sensors (PALSAR, AVNIR-2, and PRISM) and Their Use for Bio- and Geophysical Parameters Retreivals, IEEE TGRS, ALOS special issue, Vol. 47, No.12,  pp. 3951-3959, Dec. 2009
  12. Touzi R., A. Deschamps and G. Rother, “Phase of target scattering for wetland characterization using polarimetric C-band SAR”,  IEEE TGRS,  Sep. 2009
  13. Brisco, B., Touzi, R., van der Sanden, J.J., Charbonneau, F., Pultz, T.J., and M. D’Iorio. 2008. Water resource applications with RADARSAT-2—A preview. International Journal of Digital Earth 1(1):130–147
  14. Touzi, R., “Target scattering decomposition in terms of roll invariant target parameters”, IEEE TGRS,  Vol. 45, No.1, pp. 73-84, Jan. 2007.
  15. R. Touzi. Speckle effect on polarimetric target scattering decomposition of SAR imagery . Can. J. Rem. Sens., Vol. 33, No. 1:60–68, Feb. 2007
  16. R. Touzi, A. Deschamps and G. Rother, “Wetalnd characterization using polarimetric Radarsat-2 capability”,  Can. J. Rem. Sens., Vol. 33, No. 1:S56–S67, 2007
  17. R. Touzi, C.E. Livingstone and F. Charbonneau, “A general method for calibration of the Convair-580 SAR”, CJRS, Vol. 31, No.1, pp. 52-60, 2005
  18. Touzi, R.,  Raney, R.K.  and Charbonneau, F., “On the use of permanent symmetric scatterers for ship characterization”,  IEEE TGRS, VOL. 42, NO. 10, pp. 2039-2045,  Oct. 2004
  19. Beaulieu, J.M. and R. Touzi, Segmentation of Textured Polarimetric SAR Scenes by Likelihood Approximation, , IEEE TGRS, VOL. 42, NO. 10, pp. 2063-2072, Oct. 2004
  20. Touzi, R., Landry, R., and Charbonneau, F, “Forest type discrimination using Calibrated C-Band Polarimetric SAR data”. Can. J. Remote Sensing, Vol. 30, No. 3, pp. 543–551, 2004
  21. Touzi, R., Boerner, W., Lee, J.S., and Luneberg, E., “A review of polarimetry in the context of synthetic aperture radar: Concepts and information extraction”,  Canadian Journal of Remote Sensing, Special issue on RADARSAT-2,  June 2004
  22. Touzi, R. and Charbonneau, F., “The PWS: a friendly tool for an effective analysis of polarimetric RADARSAT-2 data”, Canadian Journal of Remote Sensing, Special issue on RADARSAT-2,  June 2004
  23. Touzi, R., Charbonneau, F., Hawkins, R.K., and Vachon, P.W., “Ship detection and characterization using polarimetric SAR”. Canadian Journal of  Remote Sensing, Special issue on RADARSAT-2, June 2004
  24. R. Touzi, “A review of SAR image speckle filtering”, IEEE TGRS, Vol. 40, No. 11, pp. 2392-2404, Nov. 2002.
  25. R. Touzi and F. Charbonneau, “Characterization of target symmetric scattering using polarimetric SARs”, IEEE TGRS, Vol. 40, No. 11, pp. 2507-2516, Nov. 2002.
  26. R. Touzi and A. Sasitiwarih, “RADARSAT optimum configurations for trail and road detection in Indonesian forests”, Canadian Journal of Remote Sensing, Vol. 27, No. 5, Oct. 2001
  27. Touzi R., A. Lopes, J. Bruniquel , and P. Vachon, “Unbiased estimation of the coherence for SAR Imagery”, IEEE Trans. Geoscience Rem.  Sens.,Vol. 37, No. 1, jan. 1999
  28. Touzi R. and A. Lopes, “Statistics of the Stokes parameters and of the complex coherence parameters in one-look and multi-look speckle fields”, IEEE Trans. Geoscience Rem.  Sens., Vol. 34, No. 2, pp. 519-531, March 1996
  29. Touzi R. and A. Lopes, “The principle of speckle filtering in  polarimetrie SAR imagery”, IEEE Trans. Geoscience Rem. Sens.,  Vol. 32, No. 5, pp. Sep. 1994
  30. Touzi R., C.E. Livingstone, J.R.C. Lafontaine, and T.I. Lukowski, “Consideration of antenna gain and phase patterns for  calibration of polarimetric SAR data”, IEEE Trans. Geoscience  Rem. Sens., Vol. 31, No. 6, pp. 1132‑1145, Nov. 1993.
  31. Touzi R., “Extraction of a point target response  characteristics from SAR complex data”, IEEE Trans. Geoscience  Rem. Sens., Vol. 30, No. 6, Nov. 1992.
  32. Touzi R., S. Goze, T. Le Toan , A. Lopes, and E. Mougin , “Polarimetric  discriminators for SAR images” ,  IEEE Trans. Geoscience Rem.  Sens., Vol.30, No. 5, pp 973‑980, Sep. 1992.
  33. Lopes A., R. Touzi, and E. Nezry, “Adaptive speckle filters and  scene heterogeneity”, IEEE Trans. on Geo. and Rem. Sens., Vol.  28, No. 6, Nov. 1990.
  34. Touzi R., A. Lopes, and P. Bousquet, “A statistical and  geometrical edge detector for SAR image”, IEEE  Trans. on Geo. and Rem. Sens., Vol. 26, No. 6, pp. 764‑773,  Nov. 1988.

Research facility

580 Booth Street
Ottawa, ON K1A 0E8
Canada

Language

English
French

Other languages

Arabic