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Contact: R. Natsuaki Lab., Room 111A3, 11th floor of Engineering Bld.2,
Department of Electrical Engineering and Information Systems (EEIS),
School of Engineering, The University of Tokyo,
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
natsuaki [atatat] ee.t.u-tokyo,ac.jp
Classes, Career Information, Journal Publications, Conference Publications, Book Publications, Received Awards, Activitiess

Classes

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Career information
Experiences
November 2019 - Current: Part-time researcher of National Institute of Advanced Industrial Science and Technology(AIST), Japan
April 2017 - Current: Lecturer in Department of Electrical Engineering and Information Systems, The University of Tokyo, Japan.
April 2018 - 2020: Guest Scientist of Microwaves and Radar Institute, German Aerospace Center (DLR), Germany.
Sponsored by JSPS Overseas Research Fellowships of the Japan Society for the Promotion of Science (JSPS).
April 2014 - March 2017: Aerospace Project Research Associate (Post Doc. position) in Japan Aerospace Exploration Agency (JAXA), Japan.
April 2012 - March 2014: Research Fellowship of the Japan Society for the Promotion of Science (JSPS) and Grant-in-Aid. Fellow number 24-3232.
April 2011 - March 2012: Research Assistantship and Research Funding for Young Students and Researchers, Global Center of Excellence program (GCOE) "Secure Life Electronics" The University of Tokyo, Japan.
Education
March 2014: Received Dr. Eng. degree at Department of Electrical Engineering and Information Systems (EEIS), Graduate School of Engineering, The University of Tokyo.
March 2011: Received Master's degree of engineering at Department of Electrical Engineering and Information Systems (EEIS), Graduate School of Engineering, The University of Tokyo.
March 2009: Received Bachelor's degree of engineering, Department of Electronics Engineering, Faculty of Engineering, The University of Tokyo.
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Journal Papers
Authors Title Details DOI
2020
Y.Otsuka, T.Shimada, R.Natsuaki, A.Hirose , Consideration on singular-point generating mechanisms by analyzing the effect of phase-and-polarization optimization in PolInSAR, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, (Accepted). 10.1109/JSTARS.2020.2983801
R. Natsuaki and H. Nagai, Synthetic Aperture Radar Flood Detection under Multiple Modes and Multiple Orbit Conditions: A Case Study in Japan on Typhoon Hagibis, 2019, IEEE Transactions on Geoscience and Remote Sensing, Vol. 57, No. 10, pp. 7907-7917, 2019. 10.3390/rs12060903
2019
Y. Li, S. Martinis, M. Wieland, S. Schlaffer, and R. Natsuaki, Urban flood mapping using SAR intensity and interferometric coherence via Bayesian network fusion, Remote Sensing, Vol. 11, No. 19, 2231, 2019. 10.3390/rs11192231
Y. Sunaga, R. Natsuaki and A. Hirose, Land form classification and similar land-shape discovery by using complex-valued convolutional neural networks, IEEE Transactions on Geoscience and Remote Sensing, Vol. 57, No. 10, pp. 7907-7917, 2019. 10.1109/TGRS.2019.2917214
2018
S.Fujinami, R.Natsuaki, K.Ichikawa and A.Hirose, Experimental analysis on the mechanisms of singular point generation in InSAR by employing scaled optical interferometry, IEEE Transactions on Geoscience and Remote Sensing, Vol. 56, No. 7, pp. 3830-3837, 2018. 10.1109/TGRS.2018.2812898
A.Hirose, T. Shimada and R. Natsuaki Pixel-by-pixel scattering mechanism vector optimization in high resolution PolIn-SAR: Its basic ideas and significance (Invited, In Japanese), IEICE Transactions on Electrionics, Vol. 101-C, No. 8 pp. 290-299, 2018. Available Here
R. Natsuaki, H. Nagai, N. Tomii, T. Tadono, Sensitivity and Limitation in Damage Detection for Individual Buildings Using InSAR Coherence - A Case Study in 2016 Kumamoto Earthquakes, Remote Sensing, Vol. 10, No. 2, 245, 10.3390/rs10020245
T.Shimada, R.Natsuaki and A.Hirose, Pixel-by-pixel scattering mechanism vector optimization in high resolution PolInSAR, IEEE Transactions on Geoscience and Remote Sensing, Vol. 56, No. 5, pp. 2587-2596, 2018. 10.1109/TGRS.2017.2768604
2017
R. Natsuaki, T. Motohka, M. Watanabe, M. Shimada and S. Suzuki, An autocorrelation based radio frequency interference detection and removal method in azimuth frequency domain for SAR image, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 10, no. 12, pp. 5736-5751, Dec. 2017. 10.1109/JSTARS.2017.2775205
R. Natsuaki, T. Anahara, T. Kotoura, Y. Iwatsuka, N. Tomii, H. Katayama, and T. Nishihata, Synthetic Aperture Radar Interferometry for Disaster Monitoring of Harbor Facilities, Journal of Disaster Research, Vol. 12, No. 3, pp. 526-535, 2017. 10.20965/jdr.2017.p0526
R. Natsuaki, T. Motohka, M. Shimada and S. Suzuki, Burst Misalignment Evaluation for ALOS-2 PALSAR-2 ScanSAR-ScanSAR Interferometry, Remote Sensing, Vol. 9, No.3, 216, 2017. 10.3390/rs9030216
R. Natsuaki, M. Watanabe, M. Ohki, T. Motohka, S. Suzuki and M. Shimada, Volcanic Ash detection using ALOS-2 PALSAR-2 multi-temporal interferometric coherence including ScanSAR mode data, (in Japanese) Journal of the Remote Sensing Society of Japan, Vol. 37, No. 1, pp. 1-12, 2017. 10.11440/rssj.37.1
2016
R. Natsuaki, T. Anahara, T. Kotoura, Y. Iwatsuka, N. Tomii, H. Katayama and T. Nishihata, Preliminary Experiment for Disaster Monitoring in Harbor Using Synthetic Aperture Radar Interferometry (In Japanese) Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering), Vol. 72, No. 2, pp 748-753, 2016. 10.2208/jscejoe.72.I_748
T. Anahara, R, Natsuaki, T. Kotoura, Y. Iwatsuka, Y. Sasaki, N. Tomii, Y. Maeda, T. Nishihata, Deformation Measurement of Harbor Facilities with Satellite-Borne InSAR Analysis (in Japanese) Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) Vol. 72, No. 2, pp. 1633- 1638, 2016. 10.2208/kaigan.72.I_1633
M. Ohki, M. Watanabe, R. Natsuaki, T. Motohka, H. Nagai, T. Tadono, S. Suzuki, K. Ishii, T. Itoh, T. Yamanokuchi, M. Shimada, Flood area detection by ALOS-2 PALSAR-2 data for the 2015 heavy rainfall disaster in Kanto and Tohoku area, Japan, (in Japanese) Journal of the Remote Sensing Society of Japan, Vol. 36, No. 4, pp. 348-359, 2016. 10.11440/rssj.36.348
R. Natsuaki, H. Nagai, T. Motohka, M. Ohki, M. Watanabe, R. B. Thapa, T. Tadono, M. Shimada and S. Suzuki, SAR interferometry using ALOS-2 PALSAR-2 data for the Mw 7.8 Gorkha Nepal earthquake, Earth, Planets and Space, 68:15, 2016. 10.1186/s40623-016-0394-4
2015
E. O. Lindsey, R. Natsuaki, X. Xu, M. Shimada, M. Hashimoto, D. Melgar, and D. T. Sandwell, Line-of-sight displacement from ALOS-2 interferometry: Mw 7.8 Gorkha Earthquake and Mw 7.3 aftershock, Geophysical Research Letters, Vol. 42, pp. 6655-6661, 2015. 10.1002/2015GL065385
2014 and past
R. Natsuaki and A. Hirose, Circular Property of Complex-Valued Correlation Learning in CMRF-Based Filtering for Synthetic Aperture Radar Interferometry, Neurocomputing, Vol. 134, No. 25, pp. 165-172, 2014. 10.1016/j.neucom.2012.12.071
K. Terabayashi, R. Natsuaki, A. Hirose, Ultrawideband Direction-of-Arrival Estimation Using Complex-Valued Spatiotemporal Neural Networks, IEEE Transactions on Neural Networks and Learning Systems, Vol. 25, No. 9, pp. 1727-1732, 2014. 10.1109/TNNLS.2014.2313869
R. Natsuaki and A. Hirose, "InSAR local co-registration method assisted by shape-from-shading," IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol.6, Issue 2, pp. 953-959, 2013. 10.1109/JSTARS.2012.2219506
R. Natsuaki and A. Hirose, "SPEC Method - A fine co-registration method for SAR interferometry," IEEE Transactions Geoscience and Remote Sensing, Vol.49, No.1, pp. 28-37, 2011. 10.1109/TGRS.2010.2057435

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International Conferences
Authors Title Details
2020
2019
R. Natsuaki and A. Noda, Demonstration of InSAR-based Three Dimensional Continuous Deformation Monitoring, International Geoscience and Remote Sensing Symposium (IGARSS) 2019, TU2.R7.3 (Invited), Jul. 2019.
R. Natsuaki, N. Sakar, N. Yague-Martinez, M. Pinheiro and P. Prats-Iraola, Investigations on the Optimum Combination of Azimuth Phase Coding and Up- and Down-Chirp Modulation for Range Ambiguity Suppression, International Geoscience and Remote Sensing Symposium (IGARSS) 2019, WEP1.PC.1, Jul. 2019.
H. Kim, J. Song, R. Natsuaki and A. Hirose, Dependence of Polarimetric Characteristics on SAR Resolutions: Experimental Analysis, International Geoscience and Remote Sensing Symposium (IGARSS) 2019, THP2.PC.9, Jul. 2019.
Y. Otsuka, R. Natsuaki and A. Hirose, Enhancement of Polarization Mechanism in Pixel-by-Pixel Phase Optimization in PolInSAR, International Geoscience and Remote Sensing Symposium (IGARSS) 2019, FR2.R11.4, Jul. 2019.
R. Natsuaki and P. Prats-Iraola, Time variant and narrow bandwidth RFI detection in multi-receiver SAR: preliminary study in ALOS-2, RFI 2019 Toulouse, TU-AM, Sep. 2019.
J. Song, H. Kim, R. Natsuaki and A. Hirose, Experimental analysis on spatial resolution and convergence of Poincare parameter versus window-size for ALOS-2 and Pi-SAR-L2 observation, Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) 2019 Xiamen, pp. 1-4. 2019.
A. Hirose, Y. Sunaga and R. Natsuaki, Recent Progress in Adaptive SAR Data Structurization in Complex and Hypercomplex Domain, International Workshop on Big SAR Data (BigSARData), pp. 1-6, (Invited), 2019.
2018
R. Natsuaki, T. Shimada and A. Hirose, Effect of Temporal Baseline in Pixel-by-Pixel Scattering Mechanism Vector Optimization for PolInSAR, 12th European Conference on Synthetic Aperture Radar (EUSAR 2018), D.9.2 (Invited), June 2018.
R. Natsuaki and A. Hirose, Interferometric and Polarimetric Effect of Wideband Radio Fre-quency Interference in ALOS-2, 12th European Conference on Synthetic Aperture Radar (EUSAR 2018), D.9.3 (Invited), June 2018.
R. Natsuaki and A. Hirose, L-band SAR Interferometric analysis for flood detection in urban area - A case study in 2015 Joso flood, Japan, International Geoscience and Remote Sensing Symposium (IGARSS) 2018, TH4.R12.6 (Invited), Jul. 2018.
R. Natsuaki and A. Hirose, Profiles of RFI in ALOS-2 images - a case study in Tokyo bay, Japan, International Geoscience and Remote Sensing Symposium (IGARSS) 2018, MO4.R9.2 (Invited), Jul. 2018.
Y. J. Kwak, R. Natsuaki, S. H. Yun, Effect of Building Orientation on Urban Flood Mapping Using ALOS-2 Amplitude Images, International Geoscience and Remote Sensing Symposium (IGARSS) 2018, TUP1.PD.5, Jul. 2018.
Y.Sunaga, R.Natsuaki, A.Hirose, Proposal of complex-valued convolutional neural networks for similar land-shape discovery in interferometric synthetic aperture radar, Int'l Conf. on Neural Information Processing (ICONIP) 2018, pp. 340-349, 2018.
Y.Otsuka, T.Shimada, R.Natsuaki, A.Hirose, Analysis of Singular-point Generating Mechanisms Based on the Correlations among the Parameters inCoherency Matrix and Those in the Optimized Scattering-mechanism Vector in PolInSAR, Progress in Electromagnetics Symposium (PIERS) 2018, pp. 474, 2018.
2017
R. Natsuaki, A. Hirose, Temporally coherent radio frequency interference in ALOS-2 PALSAR-2 image, CEOS SAR Calibration and Validation Workshop 2017, S23-1, September 2017.
R. Natsuaki, T. Motohka, S. Suzuki, T. Tadono, Radio Frequency Interference in ALOS-2 PALSAR-2 Interferogram, 32nd URSI General Assembly and Scientific Symposium, EFGHJ1-3 (Invited), August, 2017.
R. Natsuaki, T. Motohka, T. Tadono, S. Suzuki, Polarimetric Characteristics of Temporarily Coherent RFI in ALOS-2 PALSAR-2, IEEE International Geoscience and Remote Sensing Symposium 2017, WEP2.PB.3, July 2017.
R. Natsuaki, M. Ohki, H. Nagai, T. Motohka, T. Tadono, M. Shimada, S. Suzuki, Performance of ALOS-2 PALSAR-2 for Disaster Response, IEEE International Geoscience and Remote Sensing Symposium 2017, WE1.L4.4 (Invited), July 2017.
R. Natsuaki, T. Motohka, S. Suzuki and T. Tadono, Ionospheric effect observation using long path of ALOS-2 ScanSAR InSAR, 2nd GEOlab-RISH Joint workshop on GNSS and SAR Technologies for Atmospheric Sensing, The 331st Symposium on Humanosphere Science, S-02, March 2017.
2016
R. Natsuaki, T. Motohka, S. Suzuki and M. Shimada, Validation of burst overlapping for ALOS-2 PALSAR-2 ScanSAR-ScanSAR interferometry, CEOS-SAR 2016, Validation and Applications I-1, September 2016.
R. Natsuaki, T. Motohka, M. Ohki, M. Watanabe and S. Suzuki, Burst overlapping of ALOS-2 PALSAR-2 ScanSAR-ScanSAR interferometry, SPIE Remote Sensing 2016, 10000-5, September 2016.
R. Natsuaki, M. Watanabe, T. Motohka and S. Suzuki, RFI Detection and Removal in Range-Time Azimuth-Frequency Domain, IEEE International Geoscience and Remote Sensing Symposium 2016, MO4.L9.5, July 2016.
M. Watanabe, M. Sonobe, R. Natsuaki, S. Suzuki, Trial of Volcanic Ash Detection Using L-band Synthetic Aperture Radar (SAR), IEEE International Geoscience and Remote Sensing Symposium 2016, FR3.L12.4, July 2016.
R. Natsuaki, T. Motohka, M. Watanabe, M. Ohki, Rajesh B. Thapa, H. Nagai, T. Tadono, M. Shimada and S. Suzuki, Emergency Observation and Disaster Monitoring Performed by ALOS-2 PALSAR-2, IEEE International Geoscience and Remote Sensing Symposium 2016, WE1.L10.3 (Invited), July 2016.
Y. Kankaku, S. Suzuki, T. Motohka, M. Ohki, R. Natsuaki, M. Shimada, ALOS-2 Operation Status, IEEE International Geoscience and Remote Sensing Symposium 2016, WE1.L10.1 (Invited), July 2016.
R. Natsuaki, M. Watanabe, M. Ohki, and S. Suzuki, Disaster Affected Area Detection and Display Application for Non-SAR Specialists, 11th European Conference on Synthetic Aperture Radar (EUSAR 2016), G1.4.4 (Invited), June 2016.
R. Natsuaki, H. Nagai, T. Motohka, M. Ohki, M. Watanabe and S. Suzuki, Emergency observation and its analysis using ALOS-2 PALSAR-2 in 2015, SPIE Asia-Pacific Remote Sensing 2016: 9877-41, April 2016.
2015
R. Natsuaki, T. Motooka, M. Shimada, Y. Kankaku, M. Watanabe, S. Suzuki, Current status of the ALOS-2 PALSAR-2 calibration and validation, CEOS-SAR 2015. Session 4-2, September 2015.
A. Muhuri, A. Bhattacharya, R. Natsuaki and A. Hirose, Glacier Surface Velocity Estimation Using Stokes Vector Correlation, The 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR), pp. 606-609, September 2015.
S. Fujinami, R. Natsuaki and A. Hirose, Scaled experimental analysis of singular point generation mechanisms in interferometric SAR, The 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR), pp. 226-230, September 2015.
R. Natsuaki, M. Watanabe, T. Motohka, M. Ohki and M. Shimada, Assessment of the Stability for Active Volcanic Small Island by Use of SAR Interferometry: A case study in Nishinoshima island, The 5th Asia-Pacific Conference on Synthetic Aperture Radar(APSAR), pp. 841-844, September 2015.
R. Natsuaki, H. Nagai, M. Watanabe, M. Ohki, T. Motohka, R. B. Thapa, T. Tadono, M. Shimada and S. Suzuki, Recent Disaster Response of ALOS-2 PALSAR-2 Based on SAR Interferometry, IAA Climate Change and Disaster Management Conference, IAA-MEX-15-02-01, September 2015.
S. Fujinami, R. Natsuaki and A. Hirose, Experimental Analysis of Singular Point Generation Mechanisms in Interferometric SAR Using Optics: The Possibility of Singular Point Generation By interference in a Single Pixel, IEEE International Geoscience and Remote Sensing Symposium 2015, pp. 4256-4259, July 2015.
R. Natsuaki, M. Watanabe, T. Motohka, M. Ohki, M. Shimada, Accuracy improvement by residue and amplitude based local co-registration method for ALOS-2/PALSAR-2 DInSAR, IEEE International Geoscience and Remote Sensing Symposium 2015, pp. 302-305, July 2015.
R. Natsuaki, M. Watanabe, T. Motohka, M. Ohki, M. Shimada, Clarification of the DInSAR image with Local Co-registration Method using Singular Points and Amplitude Information, The 30th International Symposium on Space Technology and Science(ISTS), 2015-n-2, April 2015.
2014 and past
R. Natsuaki, M. Watanabe, T. Motooka, M. Ohki and M. Shimada, Report of ALOS-2 / PALSAR-2 Launch and Its Recent Status, Asian Conference on Remote Sensing (ACRS) 2014, Nay Pyi Taw, Myanmar, October 2014.
R. Natsuaki and A. Hirose, Changes of dominant scatterers and propagation paths as a possible origin of singular points in radar interferometry: Experimental analysis, IEEE International Geoscience and Remote Sensing Symposium 2014, pp. 290-293, July 2014.
R. Natsuaki and M. Shimada, Local co-registration method for creating accurate SAR interferogram in mountainous regions, Symposium on Geodesy for Earthquake and Natural Hazards (GENAH) 2014, Matsushima, July 2014.
R. Natsuaki and A. Hirose Performance improvement of InSAR local co-registration with multiresolution interferogram 2013 Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) 2013 Tsukuba
R. Natsuaki and A. Hirose Phase property in complex-correlation and real-imaginary-correlation filtered SAR interferograms and its influence on DEM quality International Geoscience and Remote Sensing Symposium (IGARSS) 2013 Melbourne
R. Natsuaki and A. Hirose Improvement of ALOS interferogram quality by use of the local co-registration method using singular-point and amplitude information International Geoscience and Remote Sensing Symposium (IGARSS) 2012 Munich
A. Hirose and R. Natsuaki Circular property in complex-valued correlation learning observed in CMRF-based singular unit restoration for phase unwrapping Int'l Workshop on Intelligence Science and Intelligent Data Engineering (ISciDE) 2011 Xi'an
R. Natsuaki and A. Hirose Local co-registration for distortion reduction in SAR interferogram using amplitude information - Combination of SPEC method and shape-from-shading - International Geoscience and Remote Sensing Symposium (IGARSS) 2011 Vancouver
R. Natsuaki and A. Hirose Enhancement of filtering performance by local and nonlinear co-registration in InSAR processing Asia-Pacific Radio Science Conference (AP-RASC) 2010 Toyama.
R. Natsuaki and A. Hirose Local, nonlinear adaptive co-registration of master and slave interferometric SAR complex image data for high quality digital elevation map generation International Geoscience and Remote Sensing Symposium (IGARSS) 2009 Capetown

Other Papers and Conferences in Japanese See CiNii cite

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Book Chapters
Authors Title Details
R. Natsuaki, L-band SAR Disaster Monitoring for Harbor Facilities using Interferometric Analysis Advanced Remote Sensing Technology for Coastal Environment, Disasters, and Infrastructure, Intech Open, ISBN 978-953-51-7860-6, 2018 (printing).
H. Nagai, R. Natsuaki, M. Ishihara, T. Tadono, T. Motohka, S. Suzuki , 2016 Kumamoto Earthquake: Measuring Uplift and Depression Using Synthetic Aperture Radar Esri Map Book, Edition: 32, ISBN 978-158-948-477-1.
R. Natsuaki and A. Hirose, Local, fine co-registration of SAR interferometry using the number of singular points for the evaluation In-Tech, Recent Interferometry Applications in Topography and Astronomy (March 2012) 95-110, ISBN 978-953-51-0404-9.

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Awards
Outstanding Reviewer Award 2019, MDPI Remote Sensing, 2020
Excellent Paper Award 2nd Prize, Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) 2019 Xiamen, 2019
IEEE TGRS Best Reviewers in 2018, IEEE Transactions on Geoscience and Remote Sensing, 2019
Outstanding Reviewer Award 2018, MDPI Sensors, 2019
Map Gallery 5th Award, 12th GIS Community Forum, ESRI Japan, 2016
Map Gallery 2nd Award, 11th GIS Community Forum, ESRI Japan, 2015
Young Scientist Award, SICE Technical Committee on Remote Sensing, 2014
2013 Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Student Paper Award Grand Prix
IEICE EMT, Technical Group Young Resercher Award, 2010

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Activities
Secretary IEEE Geoscience and Remote Sensing Society All Japan Chapter, (2014-2017)
Assistant secretary Institute of Electronics, Information and Communication Engineers (IEICE) technical committee on Space, Aeronautical and Navigational Electronics (SANE) (2017).

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