Article
Geochemistry & Geophysics
Lei Zhang, Jun Hu, Xiaoli Ding, Yangmao Wen, Hongyu Liang
Summary: Differential interferometric synthetic aperture radar (DInSAR) is an important technology for determining coseismic deformation, but its processing is often affected by various errors. In this letter, a multitemporal InSAR (MTInSAR) method is proposed to accurately determine coseismic deformation by effectively separating it from other error deformation based on the analysis of preseismic and postseismic SAR images.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Environmental Sciences
Fabio Rocca, Deren Li, Stefano Tebaldini, Mingsheng Liao, Lu Zhang, Fabrizio Lombardini, Timo Balz, Norbert Haala, Xiaoli Ding, Ramon Hanssen
Summary: This research report outlines activities conducted under Dragon project 32278 on Three- and Four-Dimensional Topographic Measurement and Validation. The project was divided into three subprojects aimed at validating various satellite systems, developing new processing methods for SAR data, and improving methodologies for topographic mapping accuracy. Subproject 2 specifically focused on decorrelating targets using multi-baseline interferometric and tomographic SAR processing to accurately estimate target displacement over time.
Article
Geochemistry & Geophysics
D. W. Vasco, Sergey Samsonov, Kang Wang, Roland Burgmann, Pierre Jeanne, William Foxall, Yingqi Zhang
Summary: The study utilizes InSAR observations for estimating line-of-sight displacements, showing potential value in characterizing surface deformation background and detecting unusually large residuals.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
D. W. Vasco, Sergey Samsonov, Kang Wang, Roland Burgmann, Pierre Jeanne, William Foxall, Yingqi Zhang
Summary: This study uses InSAR observations to estimate the displacements at a natural gas storage site in Honor Rancho, California. By removing the reservoir signal, the residuals are used to characterize the background variations and identify anomalies. The results show temporal and spatial variations in the residuals, with larger displacements observed in a southern alluvial valley.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Environmental Sciences
Ruonan Zhao, Zhabko Andrey Viktorovich, Junfeng Li, Chuang Chen, Meinan Zheng
Summary: This paper presents a strategy for extracting three-dimensional mining deformation using single-geometry SAR data. The methodology includes modeling the relationship between horizontal displacement and subsidence gradient and proposing a solution strategy to improve stability. The proposed method allows for the reconstruction of 3D displacements in mining areas using various types of SAR data. The effectiveness of the method is validated through simulation and in-site data, showcasing its applicability in mining deformation monitoring.
Article
Remote Sensing
Henrik J. Persson, Jonas Jonzen, Mats Nilsson
Summary: This study successfully predicted forest above-ground biomass and stem volume in a large area in Sweden by combining data from TanDEM-X and Sentinel-2 satellite sensors with national field inventory data. The combined use of the two data sources enabled seamless mapping of AGB and VOL, while the kNN algorithm proved suitable for estimating forest variables from a combination of different satellite sensors.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2021)
Article
Environmental Sciences
Mengshi Yang, Ru Wang, Menghua Li, Mingsheng Liao
Summary: This study proposes a target characterization approach for multi-epoch InSAR post-processing to efficiently correlate the target's possible deformation types and corresponding characteristics. The approach is demonstrated on the metro network of Shanghai, China, showing its effectiveness in measuring displacements of Earth's surface over time.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Remote Sensing
Chi Zhang, Zegang Ding, Zehua Dong
Summary: A novel maximum likelihood method based on the migration feature of a moving target in the complex image domain is proposed to estimate the velocity and height of the moving target, which can decrease the computational load and has a smaller estimated error compared to the original method.
INTERNATIONAL JOURNAL OF REMOTE SENSING
(2021)
Article
Geochemistry & Geophysics
Xinhua Mao, Tianyue Shi, Ronghui Zhan, Yu-Dong Zhang, Daiyin Zhu
Summary: This article presents a new interpretation of the polar format algorithm for general bistatic spotlight synthetic aperture radar imaging, analyzing the roles of range and azimuth resampling on residual 2-D phase error and proposing a structure-aided 2-D autofocus approach to improve accuracy. Experimental results demonstrate the effectiveness of the proposed approach.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2021)
Article
Engineering, Electrical & Electronic
Chao Dai, Feng Tian, Zhiyong Suo
Summary: Spaceborne interferometric synthetic aperture radar (InSAR) technology is an effective method for obtaining digital elevation model (DEM) data. The inclined-geosynchronous (InGEO) transmitter with low earth orbit (LEO) receivers (InGEO-LEO) configuration is a novel InSAR system with high resolution, wide swath, and timeliness. However, the conventional Newton iterative method is time-consuming for fast DEM generation in the InGEO-LEO InSAR system. To address this issue, an approximate closed-form solution (ACS) is proposed based on detailed analysis of the bistatic InGEO-LEO geometry, significantly improving the efficiency of geolocation with high precision.
IET RADAR SONAR AND NAVIGATION
(2023)
Article
Geochemistry & Geophysics
Francescopaolo Sica, Sofie Bretzke, Andrea Pulella, Jose-Luis Bueso-Bello, Michele Martone, Pau Prats-Iraola, Maria-Jose Gonzalez-Bonilla, Michael Schmitt, Paola Rizzoli
Summary: Decorrelation phenomena are always present in synthetic aperture radar interferometry, and can provide valuable information about imaged targets. This letter investigates InSAR decorrelation effects at the X-band using data from the TanDEM-X and PAZ spaceborne missions, showcasing the potential of combining bistatic and repeat-pass InSAR acquisitions.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2021)
Article
Geochemistry & Geophysics
Muhammad Fulki Fadhillah, Arief Rizqiyanto Achmad, Chang-Wook Lee
Summary: In this study, a new algorithm called ICOPS was developed to monitor surface deformation by combining persistent scatterers (PSs) and distributed scatterers (DSs). The algorithm was improved through a machine learning process and showed promising results in terms of accuracy. The advantage of this method is the increased density of measurement points and the spatial clustering information it provides about surface deformation.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Environmental Sciences
Hassan Bazzi, Nicolas Baghdadi, Francois Charron, Mehrez Zribi
Summary: This paper presents a comparative analysis between C- and L-band Synthetic Aperture Radar (SAR) data for the detection of irrigation events. The results show that the L-band is more suitable for irrigation detection than the C-band, regardless of the vegetation cover development and characteristics.
Article
Geochemistry & Geophysics
Marwan Younis, Felipe Queiroz De Almeida, Michelangelo Villano, Sigurd Huber, Gerhard Krieger, Alberto Moreira
Summary: This article introduces the method of improving the performance of SAR systems using digital beamforming technology, and provides detailed explanations on multichannel SAR and the basic operation mode of SCORE system.
IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE
(2022)
Review
Environmental Sciences
Kazuo Ouchi, Takero Yoshida
Summary: In 1978, the SEASAT satellite launched the first civilian synthetic aperture radar (SAR) for monitoring oceans and studying land applications. Despite its short operational time, SEASAT-SAR provided valuable information on land and sea, paving the way for future spaceborne SAR programs and new technologies such as InSAR and PolSAR. This article reviews the imaging processes and analyses of oceanic data using SAR, InSAR, PolSAR, and AI, covering various phenomena including ocean waves, oil slicks, ship detection, and sea ice.
Correction
Geochemistry & Geophysics
Yu Morishita, Tomokazu Kobayashi, Satoshi Fujiwara, Hiroshi Yarai
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2018)
Article
Geochemistry & Geophysics
Yu Morishita, Tomokazu Kobayashi, Satoshi Fujiwara, Hiroshi Yarai
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2018)
Article
Geochemistry & Geophysics
Tomokazu Kobayashi, Yu Morishita, Hiroshi Munekane
EARTH AND PLANETARY SCIENCE LETTERS
(2018)
Article
Environmental Sciences
Yu Morishita, Milan Lazecky, Tim J. Wright, Jonathan R. Weiss, John R. Elliott, Andy Hooper
Article
Geosciences, Multidisciplinary
Jonathan R. Weiss, Richard J. Walters, Yu Morishita, Tim J. Wright, Milan Lazecky, Hua Wang, Ekbal Hussain, Andrew J. Hooper, John R. Elliott, Chris Rollins, Chen Yu, Pablo J. Gonzalez, Karsten Spaans, Zhenhong Li, Barry Parsons
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Environmental Sciences
Milan Lazecky, Karsten Spaans, Pablo J. Gonzalez, Yasser Maghsoudi, Yu Morishita, Fabien Albino, John Elliott, Nicholas Greenall, Emma Hatton, Andrew Hooper, Daniel Juncu, Alistair McDougall, Richard J. Walters, C. Scott Watson, Jonathan R. Weiss, Tim J. Wright
Article
Geosciences, Multidisciplinary
Satoshi Fujiwara, Takayuki Nakano, Yu Morishita
EARTH PLANETS AND SPACE
(2020)
Article
Geosciences, Multidisciplinary
Yu Morishita
Summary: Ground subsidence in urban areas is a significant problem that requires continual monitoring for early detection and mitigation. This study used LiCSAR products and LiCSBAS to derive detailed deformation time series and velocities for 73 major urban areas in Japan from 2014 to 2020, revealing various temporal and spatial features of ground deformation signals. The approach of nationwide monitoring using LiCSAR products and LiCSBAS is easy to implement and can be applied to other regions globally.
PROGRESS IN EARTH AND PLANETARY SCIENCE
(2021)
Article
Geochemistry & Geophysics
T. Shreve, R. Grandin, D. Smittarello, V. Cayol, V. Pinel, M. Boichu, Y. Morishita
Summary: Surface deformation caused by dike intrusions mainly involves uplift and horizontal motion, while in some cases may also include subsidence. Reactivation of caldera ring-faults can occur due to reservoir deflation, but such events are rare during moderate eruptions. An example at Ambrym volcano in 2015 showed slip on a normal caldera ring-fault during a moderate-sized eruption, providing insight into stress changes imposed by the intruding dike and depressurizing reservoir.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Tatsuya Yamashita, Yu Morishita, Tomokazu Kobayashi
Summary: The article introduces a new method based on physical modeling to mitigate azimuth streaks in satellite synthetic aperture radar data, demonstrating successful reduction of azimuth streaks in ionosphere-affected images.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Geosciences, Multidisciplinary
Yu Morishita
Summary: Synthetic aperture radar (SAR) interferometry can accurately measure ground surface deformation. However, complicated phases can result in unwrapping errors. In this report, an effective unwrapping approach using multiple interferograms is proposed, which successfully retrieves reliable unwrapped phases in complex phase scenarios.
EARTH PLANETS AND SPACE
(2022)
Article
Geosciences, Multidisciplinary
Yu Morishita, Tomokazu Kobayashi
Summary: High-accuracy and high-resolution three-dimensional (3D) surface deformation data are crucial for understanding complex mechanisms and sources of subsurface deformation, maintaining position coordinates of existing ground features, and supporting quick recovery from disasters. This paper proposes an approach that integrates deformation data from three methods to derive 3D deformation and demonstrates its successful application in two case studies.
EARTH PLANETS AND SPACE
(2022)
Article
Geochemistry & Geophysics
Victoria Purcell, Eoin Reddin, Susanna Ebmeier, Pablo J. Gonzalez, Andrew Watson, Yu Morishita, John Elliott
Summary: This study reports on a significant volcanic eruption that occurred on Lanzarote, making it the third largest known subaerial basaltic fissure eruption in the past 1,100 years. Using satellite data, the study reveals a constant subsidence rate in the area and suggests that the overall lava volume of the eruption may have been underestimated.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Wim Simons, Taco Broerse, Lin Shen, Olga Kleptsova, Nicolai Nijholt, Andrew Hooper, Julie Pietrzak, Yu Morishita, Marc Naeije, Stef Lhermitte, Matthew Herman, Dina Anggreni Sarsito, Joni Efendi, Rob Govers, Christophe Vigny, Hasanuddin Zainal Abidin, Gatot Haryo Pramono, Cahyo Nugroho, Pieter Visser, Riccardo Riva
Summary: A devastating tsunami struck Palu Bay after the 2018 Palu earthquake in Indonesia. This study examines the contribution of co-seismic deformation to the tsunami. Using geodetic data, the researchers estimate a high-resolution 3D displacement field and simulate tsunami scenarios. They conclude that co-seismic deformation was the main driver behind the tsunami.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)