Article
Environmental Sciences
Siung Lee, Seohyeon Kim, Hyunjun An, Hyangsun Han
Summary: This study measured the annual ice velocities of the Cook Ice Shelf using the offset tracking technique on Sentinel-1 synthetic aperture radar images obtained from 2017 to 2022. The direction of the ice flow remained constant during this period, but the magnitude of the annual ice velocities varied. The Cook East Ice Shelf showed stable annual ice velocities, while the Cook West Ice Shelf experienced a significant increase in ice velocities due to the reduction in ice shelf volume and the development of surface crevasses and rifts.
Article
Environmental Sciences
Jue Zhang, Ping He, Xiaoping Hu, Zhumei Liu
Summary: This study used the sub-pixel offset technique with multi-temporal Sentinel-2 optical images to estimate the time-series displacement of lake ice in Lake Khovsgol from December 7, 2020 to June 17, 2021. The results show different displacement patterns in the growth, active, and melting stages of seasonal lake ice, with a delayed freezing date possibly due to global warming. Providing insights into the regional climate characteristics, this research serves as a valuable reference for lake ice studies in the region.
Article
Engineering, Geological
Dingwen Zhang, Wentao Yang, Chong Xu, Tao Ye, Qiwei Liu
Summary: A new method is proposed in this study to extract deforming landslides from background noise using time-series Sentinel-2 images. The method was tested along a section of the Jinsha River in southwest China and was found to be effective in eliminating background noise and isolating deforming landslides.
Article
Geography, Physical
Qinghui Zhu, Chang-Qing Ke, Haili Li
Summary: This study used Sentinel-1 SAR imagery to examine glacier surges in the Kongur Tagh area, identifying key characteristics of surging glaciers and discovering several surge events based on quantifiable criteria. The results indicated that surges in this region were mainly induced by thermal and hydrological trigger mechanisms.
Article
Engineering, Electrical & Electronic
Shiyi Li, Silvan Leinss, Irena Hajnsek
Summary: A method is proposed to improve ground surface displacement estimation by stacking NCC to significantly suppress noise floor, resulting in higher spatial resolution and coverage. The method utilizes redundant information in multiple NCCs, making tracking more robust.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2021)
Article
Remote Sensing
Gang Li, Yanting Mao, Xiaoman Feng, Zhuoqi Chen, Zhibin Yang, Xiao Cheng
Summary: In this study, a fusion method combining Sentinel-1 and-2 images was used to monitor the glacier flow velocity of the Petermann glacier in Greenland. By removing bad matchings and using the least squares method, a complete and high-quality time series of glacier velocity was obtained. The research found that the fusion of Sentinel-1 and-2 improved the completeness of the ice movement time series for polar glaciers.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2023)
Article
Geography, Physical
Seong-Woo Jung, Sang-Hoon Hong
Summary: In this study, the ice velocity of the Narsap Sermia glacier in Greenland was examined using synthetic aperture radar (SAR) observations from 2013 to 2020. Seasonal variations were observed, with an increase in velocity in May and June, and a decrease in September. The overall trend showed an acceleration of ice velocities, reaching 6.0 km/year in 2020. The relationship between glacier velocity and temperature data was also investigated.
GISCIENCE & REMOTE SENSING
(2023)
Article
Environmental Sciences
Georg Pointner, Annett Bartsch
Summary: This study aimed to quantify changes in backscatter anomalies on Arctic lakes possibly related to methane seepage using time series analysis of SAR imagery. It found anomalies in Lake Neyto and other regions, presenting a methodology for assessment but also identifying issues with automatic threshold-based counting. Visualizations of backscatter images proved useful for identifying target areas for future field-based research.
Article
Engineering, Multidisciplinary
Yin YuePing, Liu XiaoJie, Zhao ChaoYing, Roberto Tomas, Zhang Qin, Lu Zhong, Li Bin
Summary: The translation discusses the importance of multi-dimensional, long-term time series displacement monitoring in generating early warnings for active landslides and mitigating geohazards. It introduces an improved cross-platform SAR offset tracking method that can estimate high-precision landslide displacements in two and three dimensions, as well as calculate long-term time series displacements over a decade. The method optimizes the traditional SAR offset tracking workflow by incorporating ortho-rectification, adaptive matching window, and displacement inversion network design. Mathematical equations are built to estimate the 2D and 3D long-term time series landslide displacements using cross-platform SAR observations. The proposed method is demonstrated using ALOS/PALSAR-1 and ALOS/PALSAR-2 images of the Laojingbian landslide in China, showing significant improvements over traditional methods. The method also allows for understanding the fine-scale landslide kinematics, performing early warning of hazard, and forecasting future displacement evolution.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Environmental Sciences
Johannes Lohse, Anthony P. Doulgeris, Wolfgang Dierking
Summary: This study investigates the inclusion of Sentinel-1 texture features in a Bayesian classifier to improve the classification of sea ice types in SAR images. Results show that texture features play a crucial role in classification, especially in the generalized separation of ice and water, as well as the classification of young ice and multi-year ice, leading to significant improvements in classification accuracy.
Article
Environmental Sciences
Yikai Zhu, Chunxia Zhou, Dongyu Zhu, Tao Wang, Tengfei Zhang
Summary: Landfast ice has experienced a significant decline, affecting ice travel, marine habitats, and industrial use. Mapping ice deformation and investigating causes are urgent tasks for stability and development. This study examines time-series deformation and influential factors. Using satellite images, the vertical and horizontal deformations were analyzed. Factors such as wind and ocean currents were found to affect horizontal deformation, while sea-level tilt and ice growth caused spatial differences in the vertical direction. These results are important for predicting future ice deformation and guiding on-ice activities.
Article
Environmental Sciences
Zhaohua Chen, Benoit Montpetit, Sarah Banks, Lori White, Amir Behnamian, Jason Duffe, Jon Pasher
Summary: This study aims to monitor the spatial-temporal pattern of deformation over landfast ice in the Arctic using InSAR. Different sensors showed consistent temporal and spatial patterns of deformation, with horizontal and vertical deformations monitored using a multi-dimensional SBAS technique. The results demonstrated horizontal deformation ranging from -95 to 85 cm, and vertical deformation ranging from -41 to 63 cm in Cambridge Bay, Nunavut, Canada during February-April 2019. The coherence over ice from C-band was maintained over a shorter time interval compared to L-band due to temporal decorrelation.
Article
Geography, Physical
Thomas Lavergne, Montserrat Pinol Sole, Emily Down, Craig Donlon
Summary: Sea-ice motion impacts ship navigation, sea-ice thickness distribution, sea-ice export to lower latitudes, and re-circulation in polar seas. Satellite remote sensing is an effective way to monitor global sea-ice drift, with the swath-to-swath approach showing improved accuracy compared to the daily map method. This study evaluates the impact of geolocation uncertainty and imaging resolution on the accuracy of sea-ice drift vectors and suggests adopting the swath-to-swath approach for future sea-ice drift products.
Article
Environmental Sciences
Kiledar Singh Tomar, Sheetal Kumari, Alvarinho J. Luis
Summary: This study investigated the ice flow dynamics of the Polar Record Glacier from December to April between 2016 and 2019 using remote sensing techniques. The results showed fluctuating ice flow velocities, with higher speeds near the glacier terminus and lower values towards the ice sheet portion. The study also observed changes in the glacier's front position and total area, attributing the increased speed in early winter to ice-free water surrounding the glacier terminus.
GEOCARTO INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Josef Kellndorfer, Oliver Cartus, Marco Lavalle, Christophe Magnard, Pietro Milillo, Shadi Oveisgharan, Batu Osmanoglu, Paul A. Rosen, Urs Wegmuller
Summary: This dataset is the first of its kind to provide spatial representation of multi-seasonal C-band Synthetic Aperture Radar (SAR) interferometric repeat-pass coherence and backscatter signatures globally. It contains detailed information on how decorrelation affects interferometric measurements of surface displacement, making it valuable for various mapping applications.
Article
Environmental Sciences
Suresh Krishnan Palanisamy Vadivel, Duk-jin Kim, Jungkyo Jung, Yang-Ki Cho, Ki-Jong Han
Summary: The study utilized InSAR technique to assess the VLM at tide gauges in Korea, revealing overall stability with the largest VLM observed at the Pohang tide gauge station. Higher rates of uplift were observed along the coast of the Yellow Sea, while higher rates of subsidence were observed at Jeju and Seogwipo tide gauges. The approach provides unprecedented spatial and temporal resolution for estimating VLM rates at selected tide gauges when in-situ and GNSS observations are not available.
Article
Remote Sensing
Yuqing Wang, Ling Chang, Wanpeng Feng, Sergey Samsonov, Wenjun Zheng
Summary: This study evaluated the performance of four Global Atmospheric Models (GAMs) for tropospheric-phase delay reduction in InSAR applications on the Tibetan plateau. ERA5 was found to have similar performance to GACOS products and generally outperformed other models, indicating great potential for GAMs, particularly ERA5, in APS correction for InSAR applications in the Tibetan plateau.
INTERNATIONAL JOURNAL OF REMOTE SENSING
(2021)
Article
Geochemistry & Geophysics
D. Smittarello, N. d'Oreye, M. Jaspard, D. Derauw, S. Samsonov
Summary: The ever-increasing amount of Synthetic Aperture Radar (SAR) data motivates the development of automatic processing chains to fully exploit the opportunities offered by these large databases. This paper presents a methodological improvement for InSAR pair selection and provides a toolbox for automatic SAR data downloading, interferometric pair selection, and processing. Compared to traditional methods, this new tool reduces computation time while producing similar velocity maps.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Xu Zhang, Wanpeng Feng, Hailin Du, Sergey Samsonov, Lei Yi
Summary: Using seismic and geodetic data, the detailed rupture characteristics of the 2021 M-w 7.4 Maduo earthquake were investigated. The results revealed that this earthquake was a supershear event, rupturing bilaterally along a 170 km fault segment. Furthermore, it was found that supershear earthquakes with simpler fault geometries have significantly smaller radiated energies.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Sergey Samsonov
Summary: The study utilizes SAR data from European Sentinel-1 satellites to monitor glacier dynamics, presenting a fully-automated processing system for glacier flow analysis. By investigating Muldrow Glacier in Denali National Park, the research observes an increase in glacier flow velocity and a glacier surge phenomenon during the October 2014-November 2021 period.
Article
Geochemistry & Geophysics
Francisco Delgado, Rodrigo Contreras-Arratia, Sergey Samsonov
Summary: This study provides evidence for a buoyancy-driven mechanism of magma ascent during the effusive phase of the 2008-2009 Chaiten rhyolitic eruption, and constrains the volcano plumbing system with source models from InSAR and teleseismic data. The results imply that ground deformation data alone cannot be used to forecast the temporal evolution of an eruption, and call for denser time series of extruded volume data.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Yu Jiang, Sergey V. Samsonov, Pablo J. Gonzalez
Summary: Improved imaging of fault slip is crucial for understanding earthquakes and faulting. By introducing a new regularization method, we successfully recovered complex slip propagation patterns and estimated the spatio-temporal evolution of fault slip. Applying the method to a seismic swarm, we found that aseismic slip played a significant role and the slip rates were consistent with slow earthquake processes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geography, Physical
Brittany Main, Luke Copland, Braden Smeda, Will Kochtitzky, Sergey Samsonov, Jonathan Dudley, Mark Skidmore, Christine Dow, Wesley Van Wychen, Dorota Medrzycka, Eric Higgs, Laurent Mingo
Summary: This study examines the relationship between proglacial lakes and glacier dynamics using a long-term record of observations at the terminus of Kaskawulsh Glacier in Canada. The results show that the retreat of the glacier terminus and the increase in proglacial lake area are closely related. The rapid drainage of the lake in 2016 resulted in a significant decrease in glacier velocities, with a reduction of 48% within 3 km of the terminus.
JOURNAL OF GLACIOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Ryan Schultz, Jeong-Ung Woo, Karissa Pepin, William L. Ellsworth, Howard Zebkar, Paul Segall, Yu Jeffrey Gu, Sergey Samsonov
Summary: Earthquakes induced by human activities can hinder underground resource development and result in significant economic and human losses. A recent M-L 5.6 (M-W 5.1) event near Peace River, Alberta, occurred in an area where in situ bitumen recovery is taking place. Ground deformation of 3.4 cm was caused by reverse fault slip, possibly linked to Peace River Arch faulting. These earthquakes are located in the shallow basement and near significant wastewater injection into Paleozoic strata. There is a statistical relationship between earthquakes and injection operations, with the events likely being related to in situ bitumen development, primarily due to increased pore pressure from wastewater disposal and smaller poroelastic contributions from bitumen recovery. The assessment of this induced earthquake is likely to have implications for future energy development, management, and regulation, including carbon capture and blue hydrogen.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Remote Sensing
Sergey V. Samsonov, Wanpeng Feng
Summary: This article introduces a fully automated processing system developed by the Canada Center for Remote Sensing, which measures long-term ground deformation rates in North America and Eurasia using the DInSAR processing technique. Several examples are provided to demonstrate the performance of the system, including previously unknown deformation processes observed in different regions.
CANADIAN JOURNAL OF REMOTE SENSING
(2023)
Article
Environmental Sciences
Hannes Vasyura-Bathke, Jan Dettmer, Katherine Biegel, Rebecca O. Salvage, David Eaton, Nicolas Ackerley, Sergey Samsonov, Torsten Dahm
Summary: A joint analysis of InSAR and seismic data reveals that long-term saltwater disposal in western Canada triggers resurgent earthquakes by reactivating a complex fault system. The mainshock of the earthquake sequence occurred at a depth of about 5 km and propagated towards the injection source, stopping at a depth of about 2 km. The reactivated faults are part of a regional, basement-rooted graben system and appear to be truncated by a fault that is misoriented for slip in the present-day stress regime.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Remote Sensing
Sergey Samsonov, Andree Blais-Stevens
Summary: Pipelines are crucial for transportation infrastructure as they provide a safe and efficient means of transporting oil and gas. Landslide hazards to pipelines can be reduced by using remote sensing techniques, such as radar interferometry, to detect ground deformation. This study shows that readily available Sentinel-1 data can produce high-quality deformation maps capable of detecting slow-moving landslides.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2023)
