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Weiwei Sun - IEEE Xplore Author Profile

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Author details

Weiwei Sun

Publications

35

Citations

218

Publications by Year

20062025

Co-Authors:

Chunan ChenXuxu ChenChong ChenYuqi ChenWeiyu Chen

Show All Co-Authors (45)

Weiwei Sun

Affiliation

Shanghai Institute of Intelligent Electronics & Systems, Shanghai, China

Publication Topics

Graph Neural Networks,
GPS Trajectories,
Gated Recurrent Unit,
Graph Attention Network,
Neural Network,
Raw Trajectories,
Road Network,
Road Segments,
Semantic Information,
Temporal Features,
Traffic Conditions,
Accurate Estimation Of Time

Biography

Weiwei Sun received his Bachelor's degree in computer science and technology from Fudan University, in June 1992. From Sept. 1995 to July 1998 and Sept. 1998 to Dec. 2001, he received his Master's and PhD degrees respectively in computer software and theory from Fudan University. Now he is an associate professor of School of Computer Science and the Director of Mobile Data Management Laboratory of Fudan University. His interests include wireless data broadcast, spatial database, service computing in ad hoc and etc.(Based on document published on 27 March 2013).

Publications

35

Citations

218

Publications by Year

20062025

Co-Authors:

Chunan Chen
Xuxu Chen
Chong Chen
Yuqi Chen
Weiyu Chen

Show All Co-Authors (45)

Author's Published Works

Search History

Showing 1-25 of 292 results

Conferences (195)

Journals (84)

Magazines (11)

Early Access Articles (2)

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Irena Hajnsek(228)
I. Hajnsek(64)
Konstantinos P. Papathanassiou(34)
Othmar Frey(29)
Alberto Moreira(29)
ETH Zurich, Institute of Environmental Engineering, Zurich, Switzerland(23)
Microwaves and Radar Institute, German Aerospace Center, Wessling, Germany(16)
Institute of Environmental Engineering, ETH Zurich, Zurich, Switzerland(16)
Microwaves and Radar Institute, German Aerospace Center (DLR), Wessling, Germany(13)
German Aerospace Center (DLR), Microwaves and Radar Institute, Wessling, Germany(8)
IEEE Transactions on Geoscience and Remote Sensing(40)
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing(34)
2012 IEEE International Geoscience and Remote Sensing Symposium(20)
2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)(16)
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)(15)
IEEE(291)
VDE(1)
Media(1)
Munich, Germany(21)
Milan, Italy(16)
Beijing, China(15)
Quebec City, QC, Canada(10)
Seoul, Korea (South)(10)
Synthetic Aperture Radar(144)
Interferometric Synthetic Aperture Radar(93)
Polarimetric Synthetic Aperture Radar(77)
Digital Elevation Model(63)
Incident Angle(61)

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Observing seasonal variabilities of a permafrost landscape with PolSAR, InSAR and Pol-InSAR

Paloma Saporta;Alberto Alonso-Gonzalez;Jennika Hammar;Inge Grunberg;Julia Boike;Irena Hajnsek

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Year: 2025 | Early Access Article |

Synthetic Aperture Radar (SAR) remote sensing is an established approach for observing Earth processes. The combination of different types of SAR acquisitions in polarimetric, interferometric and polarimetric-interferometric frameworks is well studied for retrieving parameters of certain landscape features such as forests and glaciers. These frameworks have only been rarely applied to permafrost r...Show More

Observing seasonal variabilities of a permafrost landscape with PolSAR, InSAR and Pol-InSAR

Paloma Saporta;Alberto Alonso-Gonzalez;Jennika Hammar;Inge Grunberg;Julia Boike;Irena Hajnsek

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Year: 2025 | Early Access Article |

TanDEM-X: The 4D Mission Phase for Earth Surface Dynamics: Science activities highlights and new data products after 15 years of bistatic operations

Irena Hajnsek;Thomas Busche;Sahra Abdullahi;Markus Bachmann;Stefan V. Baumgartner;Allan Bojarski;Jose-Luis Bueso-Bello;Thomas Esch;Thomas Fritz;Alberto Alonso-Gonzalez;Carolina Gonzalez;Lanqing Huang;Thomas Kraus;Marie Lachaise;Shiyi Li;Francisco Lopez Dekker;Kathrin Maier;Michele Martone;Pietro Milillo;Josef Mittermayer;Matteo Nannini;Konstantinos Papathanassiou;Matteo Pardini;Muriel Pinheiro;Pau Prats-Iraola;Paola Rizzoli;Marc Rodriguez-Cassola;Achim Roth;Maximilian Schandri;Rolf Scheiber;Ulrich Steinbrecher;Barbara Schweisshelm;Michelangelo Villano;Leena Julia Warmedinger;Birgit Wessel;Gerhard Krieger;Manfred Zink;Alberto Moreira

IEEE Geoscience and Remote Sensing Magazine

Year: 2025 | Early Access Article |

The main goal of the TerraSAR-X Add-On for Digital Elevation Measurements (TanDEM-X) mission is the generation of a global digital elevation model (DEM) of unprecedented accuracy and coverage. The global TanDEM-X DEM product became available in 2016, surpassed all expectations, and became a reference for a wide range of Earth science, commercial, and geospatial applications. In addition, new infor...Show More

TanDEM-X: The 4D Mission Phase for Earth Surface Dynamics: Science activities highlights and new data products after 15 years of bistatic operations

Irena Hajnsek;Thomas Busche;Sahra Abdullahi;Markus Bachmann;Stefan V. Baumgartner;Allan Bojarski;Jose-Luis Bueso-Bello;Thomas Esch;Thomas Fritz;Alberto Alonso-Gonzalez;Carolina Gonzalez;Lanqing Huang;Thomas Kraus;Marie Lachaise;Shiyi Li;Francisco Lopez Dekker;Kathrin Maier;Michele Martone;Pietro Milillo;Josef Mittermayer;Matteo Nannini;Konstantinos Papathanassiou;Matteo Pardini;Muriel Pinheiro;Pau Prats-Iraola;Paola Rizzoli;Marc Rodriguez-Cassola;Achim Roth;Maximilian Schandri;Rolf Scheiber;Ulrich Steinbrecher;Barbara Schweisshelm;Michelangelo Villano;Leena Julia Warmedinger;Birgit Wessel;Gerhard Krieger;Manfred Zink;Alberto Moreira

IEEE Geoscience and Remote Sensing Magazine

Year: 2025 | Early Access Article |

Sensitivity Analysis of Copolar Complex Coherence for Crop Monitoring At L-Band

Jiayin Luo;Juan M. Lopez-Sanchez;Irena Hajnsek

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Year: 2025 | Volume: 18 | Journal Article |

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Time series of polarimetric synthetic aperture radar (SAR) images are usually employed for agricultural crop monitoring. Most methods exploit backscattering coefficients, radar vegetation indices (RVI), and outputs from target decompositions. This article investigates the sensitivity of the copolar complex coherence to the growth of three crop types (barley, corn, and canola) using L-band data fro...Show More

Sensitivity Analysis of Copolar Complex Coherence for Crop Monitoring At L-Band

Jiayin Luo;Juan M. Lopez-Sanchez;Irena Hajnsek

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Year: 2025 | Volume: 18 | Journal Article |

Hybrid Machine Learning Forest Height Estimation From TanDEM-X InSAR

Islam Mansour;Konstantinos Papathanassiou;Ronny Hänsch;Irena Hajnsek

IEEE Transactions on Geoscience and Remote Sensing

Year: 2025 | Volume: 63 | Journal Article |

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Combining machine learning (ML) with physical models can significantly impact retrieval algorithms designed to invert geophysical parameters from remote sensing data. Such hybrid models integrate physical knowledge with domain expertise through a joint architecture, potentially enhancing performance by increasing the efficiency and flexibility of the physical model as well as the generalization an...Show More

Hybrid Machine Learning Forest Height Estimation From TanDEM-X InSAR

Islam Mansour;Konstantinos Papathanassiou;Ronny Hänsch;Irena Hajnsek

IEEE Transactions on Geoscience and Remote Sensing

Year: 2025 | Volume: 63 | Journal Article |

Toward Dry Snow Parameter Estimation by Simultaneous Multiple Squint Differential InSAR

Andreas Benedikter;Kristina Belinska;Marc Rodriguez-Cassola;Pau Prats-Iraola;Georg Fischer;Gerhard Krieger;Irena Hajnsek

IEEE Transactions on Geoscience and Remote Sensing

Year: 2024 | Volume: 62 | Journal Article |

Cited by: Papers (1)

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Spaceborne differential SAR interferometry (D-InSAR) has been demonstrated to potentially allow snow water equivalent (SWE) change measurements for dry snow on a spatial scale, resolution, and accuracy unprecedented by other sensor concepts. However, its operational use is hindered mainly because of: 1) low coherence areas resulting from temporal decorrelation, complicating a robust phase unwrappi...Show More

Toward Dry Snow Parameter Estimation by Simultaneous Multiple Squint Differential InSAR

Andreas Benedikter;Kristina Belinska;Marc Rodriguez-Cassola;Pau Prats-Iraola;Georg Fischer;Gerhard Krieger;Irena Hajnsek

IEEE Transactions on Geoscience and Remote Sensing

Year: 2024 | Volume: 62 | Journal Article |

Kriging-Based Atmospheric Phase Screen Compensation Incorporating Time-Series Similarity in Ground-Based Radar Interferometry

Yuta Izumi;Giovanni Nico;Othmar Frey;Simone Baffelli;Irena Hajnsek;Motoyuki Sato

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Year: 2024 | Volume: 17 | Journal Article |

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Accuracy of radar interferometry is often hindered by the atmospheric phase screen (APS). To address this limitation, the geostatistical approach known as Kriging has been employed to predict APS from sparse observations for compensation purposes. In this article, we propose an enhanced Kriging approach to achieve more accurate APS predictions in ground-based (GB) radar interferometry applications...Show More

Kriging-Based Atmospheric Phase Screen Compensation Incorporating Time-Series Similarity in Ground-Based Radar Interferometry

Yuta Izumi;Giovanni Nico;Othmar Frey;Simone Baffelli;Irena Hajnsek;Motoyuki Sato

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Year: 2024 | Volume: 17 | Journal Article |

Combining Differential SAR Interferometry and Copolar Phase Differences for Snow Water Equivalent Estimation

Kristina Belinska;Georg Fischer;Irena Hajnsek

IEEE Geoscience and Remote Sensing Letters

Year: 2024 | Volume: 21 | Journal Article |

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The amount of water in a snow pack can be described by the snow water equivalent (SWE). SWE is a crucial parameter for hydrological models, for example, for flood predictions. Previous studies have shown that the interferometric phase between two repeat-pass synthetic aperture radar (SAR) measurements can be used to determine the change in SWE. However, a limitation of this method is phase wraps. ...Show More

Combining Differential SAR Interferometry and Copolar Phase Differences for Snow Water Equivalent Estimation

Kristina Belinska;Georg Fischer;Irena Hajnsek

IEEE Geoscience and Remote Sensing Letters

Year: 2024 | Volume: 21 | Journal Article |

Correction of The Penetration Bias for Insar Dem Via Synergetic Ai-Physical Modeling: A Greenland Case Study

Islam Mansour;Georg Fischer;Ronny Hänsch;Irena Hajnsek;Konstantinos Papathanassiou

IGARSS 2024 - 2024 IEEE International Geoscience and Remote Sensing Symposium

Year: 2024 | Conference Paper |

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Rapid changes in the Greenland Ice Sheet require precise elevation monitoring to understand ice dynamics and predict sea level rise. X-band Interferometric Synthetic Aperture Radar (InSAR) has the potential for this purpose but is limited by microwave signal penetration biases, which can be a few meters. We present a novel hybrid modeling approach that integrates machine learning (ML) with physica...Show More

Correction of The Penetration Bias for Insar Dem Via Synergetic Ai-Physical Modeling: A Greenland Case Study

Islam Mansour;Georg Fischer;Ronny Hänsch;Irena Hajnsek;Konstantinos Papathanassiou

IGARSS 2024 - 2024 IEEE International Geoscience and Remote Sensing Symposium

Year: 2024 | Conference Paper |

Polarimetric Analysis of Biseasonal Monostatic and Bistatic Radar Observations of a Glacier Accumulation Zone at Ku-Band

Marcel Stefko;Philipp Bernhard;Othmar Frey;Irena Hajnsek

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Year: 2024 | Volume: 17 | Journal Article |

Cited by: Papers (1)

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We present ground-based Ku-band radar observations of the snow cover on top of the Great Aletsch Glacier carried out over two observation periods, in August 2021 and in March 2022. The observations were carried out with the combined mono/bistatic version of KAPRI, a full-polarimetric radar system, and revealed substantial differences between the scattering behavior of the snow cover between the tw...Show More

Polarimetric Analysis of Biseasonal Monostatic and Bistatic Radar Observations of a Glacier Accumulation Zone at Ku-Band

Marcel Stefko;Philipp Bernhard;Othmar Frey;Irena Hajnsek

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Year: 2024 | Volume: 17 | Journal Article |

The Potential of Multifrequency Spaceborne DInSAR Measurements for the Retrieval of Snow Water Equivalent

Kristina Belinska;Georg Fischer;Giuseppe Parrella;Irena Hajnsek

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Year: 2024 | Volume: 17 | Journal Article |

Cited by: Papers (3)

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The snow water equivalent (SWE) is the amount of water contained in a snow pack and is, therefore, an important variable for hydrological and climate models. Differential interferometric synthetic aperture radar (DInSAR) techniques can relate the interferometric phase of two repeat-pass SAR acquisitions to the SWE change between them. However, only a limited interval of SWE change can be retrieved...Show More

The Potential of Multifrequency Spaceborne DInSAR Measurements for the Retrieval of Snow Water Equivalent

Kristina Belinska;Georg Fischer;Giuseppe Parrella;Irena Hajnsek

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Year: 2024 | Volume: 17 | Journal Article |

A Novel Atmospheric Phase Correction Based on Kriging Incorporating Temporal Phase Evolution for Ground-Based SAR

Yuta Izumi;Othmar Frey;Motoyuki Sato;Simone Baffelli;Giovanni Nico;Irena Hajnsek

2023 8th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)

Year: 2023 | Conference Paper |

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In ground-based synthetic aperture radar (GB-SAR) interferometry applications, the generated interferograms often suffer from propagation delay in the troposphere, known as atmospheric phase screen (APS). Kriging interpolation is one of the approaches that can predict the APS in interferograms. In this presentation, we propose a novel Kriging approach for more accurate predictions of APS in multi-...Show More

A Novel Atmospheric Phase Correction Based on Kriging Incorporating Temporal Phase Evolution for Ground-Based SAR

Yuta Izumi;Othmar Frey;Motoyuki Sato;Simone Baffelli;Giovanni Nico;Irena Hajnsek

2023 8th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)

Year: 2023 | Conference Paper |

Constrained Tensor Decompositions for SAR Data: Agricultural Polarimetric Time Series Analysis

Nikita Basargin;Alberto Alonso-González;Irena Hajnsek

IEEE Transactions on Geoscience and Remote Sensing

Year: 2023 | Volume: 61 | Journal Article |

Cited by: Papers (1)

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Tensor decompositions are a powerful tool for multidimensional data analysis, interpretation, and signal processing. This work develops a constrained tensor decomposition framework for complex multidimensional synthetic aperture radar (SAR) data. The framework generalizes the canonical polyadic (CP) decomposition by formulating it as an optimization problem and allows precise control over the shap...Show More

Constrained Tensor Decompositions for SAR Data: Agricultural Polarimetric Time Series Analysis

Nikita Basargin;Alberto Alonso-González;Irena Hajnsek

IEEE Transactions on Geoscience and Remote Sensing

Year: 2023 | Volume: 61 | Journal Article |

TerraSAR-X and TanDEM-X After 13 Years of Joint SAR and DEM Mission

Markus Bachmann;Allan Bojarski;Johannes Böer;Stefan Buckreuss;Christo Grigorov;Irena Hajnsek;Ralph Kahle;Thomas Kraus;Patrick Klenk;Kay Müller;Ulrich Steinbrecher;Maximilian Schandri;Manfred Zink

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium

Year: 2023 | Conference Paper |

Cited by: Papers (2)

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The German SAR satellites TerraSAR-X and TanDEM-X are in orbit since 2007 and 2010, respectively. This paper gives an overview about the challenges faced by such long-enduring missions, recent measures taken to preserve the satellites and to continue the mission, and major lessons learned for future SAR missions.Show More

TerraSAR-X and TanDEM-X After 13 Years of Joint SAR and DEM Mission

Markus Bachmann;Allan Bojarski;Johannes Böer;Stefan Buckreuss;Christo Grigorov;Irena Hajnsek;Ralph Kahle;Thomas Kraus;Patrick Klenk;Kay Müller;Ulrich Steinbrecher;Maximilian Schandri;Manfred Zink

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium

Year: 2023 | Conference Paper |

Bistatic Radar Measurements of Terrestrial Snow at Ku-band - Phenomena, Models, and Opportunities

Marcel Stefko;Philipp Bernhard;Silvan Leinss;Othmar Frey;Irena Hajnsek

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium

Year: 2023 | Conference Paper |

Cited by: Papers (1)

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We present the results of recent observations of terrestrial snow cover with KAPRI, a Ku-band polarimetric-interferometric radar system with bistatic capabilities. The bistatic configuration allows observation of phenomena which are not observable in the monostatic regime. Observations of polarization phase differences of snow cover on top of the Great Aletsch Glacier revealed that the behaviour o...Show More

Bistatic Radar Measurements of Terrestrial Snow at Ku-band - Phenomena, Models, and Opportunities

Marcel Stefko;Philipp Bernhard;Silvan Leinss;Othmar Frey;Irena Hajnsek

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium

Year: 2023 | Conference Paper |

Real-Time Simulation of Synthetic Aperture Radar for Educational Augmented-Reality Applications

Marcel Stefko;Shiyi Li;Manuel Luck;Irena Hajnsek

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium

Year: 2023 | Conference Paper |

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Synthetic aperture radar (SAR) is an advanced measurement technique, which is often the subject of discussions between remote sensing experts, as well as other specialists and members of the general public. These discussions can however be hindered by misunderstandings caused by the rather complex principles of SAR acquisitions. We present the implementation of SAR2, an augmented-reality app for t...Show More

Real-Time Simulation of Synthetic Aperture Radar for Educational Augmented-Reality Applications

Marcel Stefko;Shiyi Li;Manuel Luck;Irena Hajnsek

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium

Year: 2023 | Conference Paper |

Sea Ice Topographic Retrieval in the Western Weddell Sea from Tandem-X

Lanqing Huang;Irena Hajnsek

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium

Year: 2023 | Conference Paper |

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Single-pass interferometric synthetic aperture radar (InSAR) offers the potential to generate sea ice digital elevation models (DEMs) despite the inherent dynamics of sea ice. However, the accuracy of sea ice DEM generation from InSAR is hindered by the varying penetration bias across different types of ice. This paper presents a new scheme to generate sea ice DEMs (i.e., snow freeboard) across di...Show More

Sea Ice Topographic Retrieval in the Western Weddell Sea from Tandem-X

Lanqing Huang;Irena Hajnsek

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium

Year: 2023 | Conference Paper |

Wet Snow Mapping In Karakoram Using Sar And Topographic Data

Shiyi Li;Lanqing Huang;Philipp Bernhard;Irena Hajnsek

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium

Year: 2023 | Conference Paper |

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Mapping seasonal wet snow (WS) is essential for climate research, hydrological assessments and natural hazards management. It is especially crucial in Karakoram as the the water supply in the region is dominated by snow melting. However, the complex terrain in Karakoram brings great challenge when employing synthetic aperture radar (SAR) data for WS mapping. In this work, we present an algorithm t...Show More

Wet Snow Mapping In Karakoram Using Sar And Topographic Data

Shiyi Li;Lanqing Huang;Philipp Bernhard;Irena Hajnsek

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium

Year: 2023 | Conference Paper |

Soil Permittivity Estimation Over Croplands Using Full and Compact Polarimetric SAR Data

Narayanarao Bhogapurapu;Subhadip Dey;Avik Bhattacharya;Carlos López-Martínez;Irena Hajnsek;Y. S. Rao

IEEE Transactions on Geoscience and Remote Sensing

Year: 2022 | Volume: 60 | Journal Article |

Cited by: Papers (6)

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Soil permittivity estimation using polarimetric synthetic aperture radar (PolSAR) data has been an extensively researched area. Nonetheless, it provides ample scope for further improvements. The vegetation cover over the soil surface leads to a complex interaction of the incident polarized wave with the canopy and subsequently with the underlying soil surface. This article introduces a novel metho...Show More

Soil Permittivity Estimation Over Croplands Using Full and Compact Polarimetric SAR Data

Narayanarao Bhogapurapu;Subhadip Dey;Avik Bhattacharya;Carlos López-Martínez;Irena Hajnsek;Y. S. Rao

IEEE Transactions on Geoscience and Remote Sensing

Year: 2022 | Volume: 60 | Journal Article |

Towards a Symbiosis of Model-Based and Machine Learning Forest Height Estimation based on TanDEM-X InSAR

Islam Mansour;Konstantinos Papathanassiou;Ronny Haensch;Irena Hajnsek

EUSAR 2022; 14th European Conference on Synthetic Aperture Radar

Year: 2022 | Conference Paper |

There is a necessity for developing and incorporating retrieval models, including Physical Models (PMs) and Machine Learning (ML) models for the inversion of geophysical parameters from multi-parameter SAR data. Over the last two decades, interferometric synthetic aperture radar (InSAR) measurements have been used for forest height estimation by means of (physical) model inversion. However, the in...Show More

Towards a Symbiosis of Model-Based and Machine Learning Forest Height Estimation based on TanDEM-X InSAR

Islam Mansour;Konstantinos Papathanassiou;Ronny Haensch;Irena Hajnsek

EUSAR 2022; 14th European Conference on Synthetic Aperture Radar

Year: 2022 | Conference Paper |

TanDEM-X and Sentinel-2: Opportunities for Investigating Retrogressive Thaw Slumps

P. Bernhard;S. Zwieback;I. Hajnsek

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

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Among the most rapid and dramatic changes related to Arctic permafrost thaw are retrogressive thaw slumps. These slumps evolve by a retreat of the slump headwall during the summer months, making their change visible by comparing digital elevation models over time or by identifying the induced vegetation changes in time-series of optical satellite images. In this study we use digital elevation mode...Show More

TanDEM-X and Sentinel-2: Opportunities for Investigating Retrogressive Thaw Slumps

P. Bernhard;S. Zwieback;I. Hajnsek

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

Snow Characterization at Ku-Band with a Bistatic Polarimetric Ground-Based Radar

Marcel Stefko;Othmar Frey;Irena Hajnsek

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

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The Ku-band provides opportunities for investigations of snow morphology through radar observations, since it exhibits a relatively high amount of scattering even from snow layers of limited depth, while maintaining low absorption. Due to technological and practical challenges, the bistatic parameter space of Ku-band radar observations of natural media such as snow, has been relatively unexplored....Show More

Snow Characterization at Ku-Band with a Bistatic Polarimetric Ground-Based Radar

Marcel Stefko;Othmar Frey;Irena Hajnsek

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

Soil Permittivity Estimation over Croplands Using Polsar Data

Naravanarao Bhogapurapu;Subhadip Dey;Avik Bhattacharya;Carlos López-Martínez;Irena Hajnsek;Y. S. Rao

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

Cited by: Papers (1)

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Polarimetric Synthetic Aperture Radar (SAR) data has been extensively used to estimate soil permittivity because of its high sensitivity to the dielectric properties of the target. However, the presence of vegetation cover induces bias in the permittivity estimates. This work utilizes the scattering-type parameters: alpha $(\overline{\alpha})$ and theta $(\theta_{\text{FP}})$ to estimate soil perm...Show More

Soil Permittivity Estimation over Croplands Using Polsar Data

Naravanarao Bhogapurapu;Subhadip Dey;Avik Bhattacharya;Carlos López-Martínez;Irena Hajnsek;Y. S. Rao

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

TanDEM-X: Mission Status and Science Activities

Irena Hajnsek;Alberto Moreira;Manfred Zink;Stefan Buckreuss;Thomas Kraus;Markus Bachmann;Thomas Busche

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

Cited by: Papers (1)

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The paper provides an up-to-date overview of the German TanDEM-X satellite mission status and its ongoing science activities. The global digital elevation model (DEM) of TanDEM-X became available in 2016 and surpassed all expectations: It has 99.9% coverage, 12-m posting, absolute height accuracy of approximately 1 m and a relative height error (standard deviation) of 0.8 m. This unique data set h...Show More

TanDEM-X: Mission Status and Science Activities

Irena Hajnsek;Alberto Moreira;Manfred Zink;Stefan Buckreuss;Thomas Kraus;Markus Bachmann;Thomas Busche

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

Investigation of Polarimetric Phase Differences in Tandem-X Data Over Young and Undeformed Sea ICE

Lanqing Huang;Irena Hajnsek

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

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Single-pass interferometric synthetic aperture radar (InSAR) is an effective technique for sea ice topographic retrieval despite the dynamics of sea ice. Co-polarimetric phase differences (CPD) provide scattering information concerning the sea ice properties. This study estimates the observational CPD from the dual-polarimetric SAR images over young ice (YI) and undeformed ice (UI) in the Western ...Show More

Investigation of Polarimetric Phase Differences in Tandem-X Data Over Young and Undeformed Sea ICE

Lanqing Huang;Irena Hajnsek

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

Intercomparison of Earth Observation Data and Methods for Forest Mapping in the Context of Forest Carbon Monitoring

Oleg Antropov;Jukka Miettinen;Tuomas Häme;Rauste Yrjö;Lauri Seitsonen;Ronald E McRoberts;Maurizio Santoro;Oliver Cartus;Natalia Malaga Duran;Martin Herold;Matteo Pardini;Kostas Papathanassiou;Irena Hajnsek

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

Cited by: Papers (2)

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ESA Forest Carbon Monitoring project (FCM) is developing Earth Observation based, user-centric approaches for forest carbon monitoring. Forest carbon accounting based on forest inventory requires precise and timely estimation of forest variables at various spatial levels accompanied by verifiable uncertainty information. In this paper, we present the algorithm trade-off and selection approach and ...Show More

Intercomparison of Earth Observation Data and Methods for Forest Mapping in the Context of Forest Carbon Monitoring

Oleg Antropov;Jukka Miettinen;Tuomas Häme;Rauste Yrjö;Lauri Seitsonen;Ronald E McRoberts;Maurizio Santoro;Oliver Cartus;Natalia Malaga Duran;Martin Herold;Matteo Pardini;Kostas Papathanassiou;Irena Hajnsek

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium

Year: 2022 | Conference Paper |

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