Results 61 to 70 of about 489 (181)

Large‐Scale Topographic Changes at Erupting Volcanoes Measured by the TanDEM‐X Digital Change Map

Earth and Space Science, Volume 12, Issue 11, November 2025.
Abstract Volcanic eruptions cause large‐scale topographic changes, through the emplacement of lava flows and lava domes, the formation of craters and calderas, and thick ash and pyroclastic deposits. Here we analyze the TanDEM‐X Digital Change Map (DCM), which compares the DEM produced during 2010–2015 with satellite acquisitions collected in 2016–2022.
Rebecca Edwards, Juliet Biggs
wiley   +1 more source

Beam Footprint Detection and Tracking for Non-cooperative Bistatic SAR [PDF]

Radioengineering, 2016
In non-cooperative bistatic synthetic aperture radar (SAR), the position of transmitter’s beam footprint should be detected and tracked in real-time to perform beam synchronization.
F. Yan, W. Chang, X. Li, Q. Zhang
doaj  

Lava Tube System Development Defined by Multispectral Imaging and InSAR: The Case of the 2024 Eruption of Fernandina Volcano (Galápagos)

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 11, November 2025.
Abstract Lava tubes are subsurface conduits within a lava flow that feed its advance. Lava tube detection is important to understand lava flow dynamics and to mitigate geohazards. Here we use InSAR‐derived surface motion data, in combination with shortwave and thermal infrared imagery, to delineate a ∼14 km long lava tube system at Fernandina volcano ...
Alexis Hrysiewicz, Peter C. LaFemina, Andrew Bell, Federico Galetto, Silvia Vallejo, Benjamin Bernard, Eoghan P. Holohan   +6 more
wiley   +1 more source

Unveiling the First Impressions of the Wide‐Swath Altimetry SWOT Mission Over the Ganga River, India

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract The Surface Water and Ocean Topography (SWOT) mission offers novel global observations of river hydrodynamics, yet its performance across varied river morphologies remains understudied. We evaluate SWOT node and raster products over a ∼210 km stretch of the Ganga River, India, during the fast‐sampling phase, using GNSS‐based continuous ...
Pankaj R. Dhote, Ankit Agarwal, Adrien Paris, Gaurish Singhal, Praveen K. Thakur, Hind Oubanas, Daniel M. Moreira, Laetitia Gal, Vaibhav Garg, Pramod Kumar, Raghavendra P. Singh, Stephane Calmant   +11 more
wiley   +1 more source

Coseismic Vertical Displacement for a Shallow Thrust Earthquake From EarthDEM Data

Geophysical Research Letters, Volume 52, Issue 18, 28 September 2025.
Abstract Coseismic vertical displacements are important observations that help improve our understanding of fault mechanisms and how earthquakes alter landscapes. It has been a challenge to quantify long‐wavelength topographic changes for thrust earthquakes using optical satellite imagery, as most recent studies focus on strike‐slip earthquakes that ...
Chunli Dai, Thomas Casteel, Jeffrey T. Freymueller, Ian M. Howat, Erik Husby   +4 more
wiley   +1 more source

SWOT Water Surface Elevation in Herbaceous Wetlands of Florida's Everglades

Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.
Abstract Observing water level variations in wetlands is important for tracking global water and carbon cycles. The Surface Water and Ocean Topography (SWOT) mission was launched to measure Earth's surface waters, but its performance in vegetated wetlands was unknown.
Solomon Kica, Tamlin M. Pavelsky, Jessica V. Fayne, Brent A. Williams   +3 more
wiley   +1 more source

A New Age of SAR: How Can Commercial Smallsat Constellations Contribute to NASA's Surface Deformation and Change Mission?

Earth and Space Science, Volume 12, Issue 1, January 2025.
Abstract In response to the 2017 Decadal Survey, NASA conducted a five‐year study on the Surface Deformation and Change (SDC) designated observable to study potential mission concepts. As part of the SDC mission study, the Commercial Synthetic Aperture Radar (ComSAR) subgroup was tasked with evaluating the current landscape of the SAR and ...
Stacey A. Huang, Batuhan Osmanoğlu, Bernd Scheuchl, Shadi Oveisgharan, Jeanne M. Sauber, MinJeong Jo, Ala Khazendar, Ekaterina Tymofyeyeva, Betsy Wusk, Arif Albayrak   +9 more
wiley   +1 more source

Moving Target Imaging Using GNSS-Based Passive Bistatic Synthetic Aperture Radar

Remote Sensing, 2020
Current studies of global navigation satellite systems (GNSS)-based bistatic synthetic aperture radar (GNSS-SAR) is focused on static objects on land. However, moving target imaging is also very significant for modern SAR systems. Imaging a moving target
Zhen-Yu He, Yang Yang, Wu Chen, Duo-Jie Weng   +3 more
doaj   +1 more source

An ISAR target motion estimation algorithm based on a differential semblance criterion

Electronics Letters, Volume 61, Issue 1, January/December 2025.
This study presents a novel approach for improving rotational motion estimation in multistatic Inverse Synthetic Aperture Radar (ISAR) imaging through a Differential Semblance Optimization (DSO) criterion. By reducing discrepancies across images from multiple transmitter–receiver pairs, our method enables precise yaw rotation estimation and produces ...
D. P. Huxley, F. M. Watson, W. R. B. Lionheart   +2 more
wiley   +1 more source

Interferometric Calibration Model for the LuTan-1 Mission: Enhancing Digital Elevation Model Accuracy

Remote Sensing
The LuTan-1 (LT-1) mission, China’s first civilian bistatic spaceborne Synthetic Aperture Radar (SAR) mission, comprises two L-band SAR satellites.
Jingwen Mou, Yu Wang, Jun Hong, Yachao Wang, Aichun Wang, Shiyu Sun, Guikun Liu   +6 more
doaj   +1 more source