Wolfgang Dierking

When classes look alike: leveraging multifrequency SAR and TIR for separating early-stage sea ice types

Eduard Khachatrian, Johannes Lohse, Truls Karlsen, Wolfgang Dierking et autres

Accurate characterization of sea ice types in synthetic aperture radar (SAR) images remains a challenge due to the dynamic nature of sea ice and the spectral similarity between certain ice classes. This study investigates the potential of multisource satellite data for refining …

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Observation and Coordination Needs for Current, Near‐Future, and Next Generation Earth‐Observing SAR Systems

Cathleen E. Jones, Åke Rosenqvist, Björn Rommen, Magdalena Fitrzyk et autres

Abstract This paper summarizes an evaluation by experts of how coordination of Earth‐observing Synthetic Aperture Radar (SAR) missions among the world's space agencies could advance toward game‐changing scientific discoveries and fully realizing SAR's practical capability to address many issues facing society. We …

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High-Resolution Sea Ice Drift Modelling Using Sentinel-2 and Discrete Element Method: Towards Subgrid Parameterization for Large-Scale Models

Raed Lubbad, Biye Yang, Nick Hughes, Wenjun Lü et autres

Large-scale sea ice models still struggle to reproduce observed drift and deformation patterns, underscoring the need for physically based representations of unresolved floe-scale processes. Advances in high-resolution modelling and satellite imagery now offer new opportunities to investigate floe-scale dynamics and their influence …

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Influence of ice and snow properties on ice ridge mapping by SAR

Anders Carlström, Lars M. H. Ulander, Wolfgang Dierking

Effects of different ice and snow properties on the signature of ice ridges in ERS-1 SAR images are investigated. Scattering models based on the physical optics approximation are applied to surface backscatter from ice ridges and frozen brash ice. In situ ice …

Editorial: The state of knowledge from operational ice service perspectives: previous and future mandates

Penelope Mae Wagner, Ed Blockley, Ludovic Brucker, Wolfgang Dierking et autres

Sea ice and iceberg services hold a unique and critical position at the interface of maritime activity, science, and policy in ice encumbered areas all around the world. They are the authoritative sources of sea ice and iceberg information and their role …

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Backscatter-sensitive retrieval of iceberg areas from Sentinel-1 Extra Wide Swath SAR data

Henrik Fisser, Anthony P. Doulgeris, Wolfgang Dierking

We present the first systematic study on Arctic iceberg area retrieval from Sentinel-1 Extra Wide Swath SAR data. Our dataset contains 4014 Arctic icebergs in open water. To detect icebergs in Sentinel-1 images, we applied a constant false alarm rate (CFAR) algorithm. …

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Multi-Frequency Sea Ice Mapping From Overlapping C- and L-Band SAR Imagery after Drift Compensation

Johannes Lohse, Wolfgang Dierking

Due to its all-day and all-weather imaging capability, synthetic aperture radar (SAR) is the main data source for continuous and reliable monitoring of sea ice in the polar regions. Furthermore, different SAR frequencies can provide valuable complementary information about sea ice and …

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Detecting Arctic Icebergs in Sea Ice in L-Band SAR Images Using a Multiscale CFAR Algorithm

Laust Færch, Wolfgang Dierking, Nick Hughes, Anthony P. Doulgeris

This study proposes a multiscale extension of the well-known constant false alarm rate (CFAR) outlier detection method for the detection of icebergs in L-band synthetic aperture radar (SAR) images. The proposed method offers the possibility to accurately detect both single icebergs or …

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Mapping icebergs in sea ice: An analysis of seasonal SAR backscatter at C- and L-band

Laust Færch, Wolfgang Dierking, Nick Hughes, Anthony P. Doulgeris

Icebergs in the Arctic can pose a threat to maritime traffic and offshore installations and influence the properties of the upper ocean layer. While icebergs in open water are regularly monitored using C-band SAR satellites, less attention has been paid to icebergs …

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Backscatter-Sensitive Retrieval of Iceberg Areas from Sentinel-1 Extra Wide Swath Sar Data

Henrik Fisser, Anthony P. Doulgeris, Wolfgang Dierking

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A comparison of constant false alarm rate object detection algorithms for iceberg identification in L- and C-band SAR imagery of the Labrador Sea

Laust Færch, Wolfgang Dierking, Nick Hughes, Anthony P. Doulgeris

Abstract. In this study, we pursue two objectives: first, we compare six different “constant false alarm rate” (CFAR) algorithms for iceberg detection in SAR images, and second, we investigate the effect of radar frequency by comparing the detection performance at C- and …

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Overview of Ground-Based Radar Measurements of Snow-Covered Sea-Ice Led During the 2022 CIRFA Arctic Cruise

Laurent Ferro-Famil, Frédéric Boutet, Stéphane Avrillon, Wolfgang Dierking et autres

This paper presents some results obtained during the 2022 CIRFA arctic cruise concerning the measurements of the radar response of different types of sea-ice using a high-resolution Ground-Based radar system operating at C band. This MIMO device was able to directly measure …

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