Results 71 to 80 of about 14,591 (204)

Permafrost Dynamics Observatory: 3. Remote Sensing Big Data for the Active Layer, Soil Moisture, and Greening and Browning

Earth and Space Science, Volume 12, Issue 1, January 2025.
Abstract Because of the remote nature of permafrost, it is difficult to collect data over large geographic regions using ground surveys. Remote sensing enables us to study permafrost at high resolution and over large areas. The Arctic‐Boreal Vulnerability Experiment's Permafrost Dynamics Observatory (PDO) contains data about permafrost subsidence ...
Elizabeth Wig, Kevin Schaefer, Roger Michaelides, Richard Chen, Leah K. Clayton, Brittany Fager, Lingcao Huang, Andrew D. Parsekian, Howard Zebker, Yingtong Zhang, Yuhuan Zhao   +10 more
wiley   +1 more source

Full-polarimetric scattering characteristics prediction from single/dual-polarimetric SAR data using convolutional neural networks

The Journal of Engineering, 2019
Scattering entropy (H), scattering angle (α) and anti-entropy (A) are useful parameters in synthetic aperture radar (SAR) image classification. Usually, full-polarimetric SAR data are needed to extract these parameters. In this study, the authors firstly
Juan Zhang, Xiaolan Qiu, Xiangfeng Wang, Yan Jin   +3 more
doaj   +1 more source

Fast Matrix Inversion and Determinant Computation for Polarimetric Synthetic Aperture Radar

, 2018
This paper introduces a fast algorithm for simultaneous inversion and determinant computation of small sized matrices in the context of fully Polarimetric Synthetic Aperture Radar (PolSAR) image processing and analysis.
Cintra, R. J., Coelho, D. F. G., Dimitrov, V. S., Frery, A. C.   +3 more
core   +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

Soil moisture retrieval under wheat crop using RISAT-1 hybrid polarimetric SAR data

Journal of Agrometeorology, 2019
The study aims to retrieve soil moisture from RISAT-1 hybrid polarimetric SAR data. Although the use of linear polarimetric SAR data has been well understood and documented, but hybrid polarimetric SAR data is grossly under explored and under reported ...
P.K. SHARMA, D. KUMAR, H. S. SRIVASTAVA, P. PATEL, T. SIVASANKAR   +4 more
doaj   +1 more source

Ionospheric Faraday Rotation Angle Estimation for Bistatic Spaceborne SAR

Electronics Letters, Volume 61, Issue 1, January/December 2025.
This paper proposes a Faraday rotation angle estimation method for bistatic spaceborne SAR. The effectiveness of the method is verified through simulation experiments and the performance of the method is analysed. Under different SNR and filtering window sizes, the estimation error range is 0.02°–0.26°. ABSTRACT Bistatic synthetic aperture radar (SAR)
Kailun Zhang, Zhuo Li
wiley   +1 more source

Classification of Complex Wishart Matrices with a Diffusion-Reaction System guided by Stochastic Distances

, 2015
We propose a new method for PolSAR (Polarimetric Synthetic Aperture Radar) imagery classification based on stochastic distances in the space of random matrices obeying complex Wishart distributions.
Alvarez, Luis, Frery, Alejandro C., Gomez, Luis, Mazorra, Luis   +3 more
core   +1 more source

A 3D Imaging Method for UAV Swarm Polarimetric SAR Based on Joint Sparse and Low‐Rank Structure Constraints

IET Image Processing, Volume 19, Issue 1, January/December 2025.
We designed a distributed UAV swarm SAR observation architecture that deploys multiple UAV‐borne SAR systems in the three‐dimensional space around the target scene. Each node operates in a monostatic mode, which not only reduces synchronization requirements but also provides robustness against single‐node failure.
Wei Li, Yanheng Ma, Xiaolin Ma, Bingxuan Li, Xingyu Zhao, Leiping Xi   +5 more
wiley   +1 more source

Polarimetric Calibration and Quality Assessment of the GF-3 Satellite Images

Sensors, 2018
The GaoFen-3 (GF-3) satellite is the first fully polarimetric synthetic aperture radar (SAR) satellite designed for civil use in China. The satellite operates in the C-band and has 12 imaging modes for various applications.
Yonglei Chang, Pingxiang Li, Jie Yang, Jinqi Zhao, Lingli Zhao, Lei Shi   +5 more
doaj   +1 more source

Detecting flying objects in synthetic aperture radar images using Moving Target Indicator methods

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
This paper presents a moving target indicator detection method (MTI) for detecting planes during take‐off in synthetic aperture radar data, and a theoretical ground‐clutter suppression method via cross‐track interferometry to detect airborne targets. The MTI method combines interferometric processing, acceleration compensation, and autofocus techniques.
Elliot J. Hansen, Brian W.‐H. Ng, Mark Preiss   +2 more
wiley   +1 more source