Structural glaciology of Isunguata Sermia, West Greenland

Jones, Christine; Ryan, Jonathan C.; Holt, Tom; Hubbard, Alun

doi:10.1080/17445647.2018.1507952

Cited by 17 publications

(19 citation statements)

References 55 publications

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“…For some areas, collecting GCPs can be unrealistic, such as in dangerous avalanche areas [40], large areas of risky glacial surface [66], or sea ice applications where these GCPs move and are, therefore, useless [89]. Bühler et al [33] noted three methods for referencing approaches and a fourth contributed by Tziavou et al [116];…”

Section: Discussion and Recommendationsmentioning

confidence: 99%

“…Several of the compiled studies (e.g., [59,62,112]) focused on utilizing SfM to analyze glacier dynamics. Specific applications included monitoring plume dynamics [73], ablation [98,99], flow velocity [66], and calving events [47,58]. Others include identifying and analyzing changes of surface features such as ice cliffs [13,22,32], cryoconite holes on ice sheets [97], and supraglacial ponds on debris-covered glaciers (e.g., [30]), testing the accuracy of DSMs with varying GCPs (e.g., [60]), and mapping hazards related to glacier collapse and glacial thinning rates (e.g., [63]).…”

Section: Uavs For Glaciologymentioning

confidence: 99%

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Applications of Unmanned Aerial Vehicles in Cryosphere: Latest Advances and Prospects

2020

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Owing to usual logistic hardships related to field-based cryospheric research, remote sensing has played a significant role in understanding the frozen components of the Earth system. Conventional spaceborne or airborne remote sensing platforms have their own merits and limitations. Unmanned aerial vehicles (UAVs) have emerged as a viable and inexpensive option for studying the cryospheric components at unprecedented spatiotemporal resolutions. UAVs are adaptable to various cryospheric research needs in terms of providing flexibility with data acquisition windows, revisits, data/sensor types (multispectral, hyperspectral, microwave, thermal/night imaging, Light Detection and Ranging (LiDAR), and photogrammetric stereos), viewing angles, flying altitudes, and overlap dimensions. Thus, UAVs have the potential to act as a bridging remote sensing platform between spatially discrete in situ observations and spatially continuous but coarser and costlier spaceborne or conventional airborne remote sensing. In recent years, a number of studies using UAVs for cryospheric research have been published. However, a holistic review discussing the methodological advancements, hardware and software improvements, results, and future prospects of such cryospheric studies is completely missing. In the present scenario of rapidly changing global and regional climate, studying cryospheric changes using UAVs is bound to gain further momentum and future studies will benefit from a balanced review on this topic. Our review covers the most recent applications of UAVs within glaciology, snow, permafrost, and polar research to support the continued development of high-resolution investigations of cryosphere. We also analyze the UAV and sensor hardware, and data acquisition and processing software in terms of popularity for cryospheric applications and revisit the existing UAV flying regulations in cold regions of the world. The recent usage of UAVs outlined in 103 case studies provide expertise that future investigators should base decisions on.

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Section: Discussion and Recommendationsmentioning

confidence: 99%

Section: Uavs For Glaciologymentioning

confidence: 99%

Applications of Unmanned Aerial Vehicles in Cryosphere: Latest Advances and Prospects

2020

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“…A comparison of photogrammetric maps collected by the UAV has been performed by Avanzi et al [10]. A flow velocity over glacier land has been conducted by Jones C et al [11]. Another studies relevant to identifying and analysing changes of surface features such as ice cliffs have been conducted by Steiner, J.F.…”

Section: Introductionmentioning

confidence: 99%

A Computational Design Analysis of UAV’s Rotor Blade in Low-Temperature Conditions for the Defence Applications

Chevula

Chillamcharal²,

Maddula

2021

International Journal of Aerospace Engineering

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This paper discusses about the critical situations faced by the Defence operations with drones in the area of Siachen Glacier in the Himalayas. The reasons for the structural failures in drone’s rotor blades and the low-performance efficiency of the drones at low-temperature conditions are highlighted. A possible solution to the above-mentioned problems has been addressed by introducing a new boundary design in the rotor blades and composite materials. The results which are shown in this paper are obtained by the computational analysis facility located at the Department of Aerospace Engineering, School of Technology, GITAM (Deemed to be University), Hyderabad. By mimicking the Siachen Glacier atmosphere conditions, the proposed rotor blade design has been analysed in CFD.

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“…In terms of glaciology and ice morphology, the Vertical Take-Off and Landing (VTOL) UAV was proved to be effective in capturing the short-lived speed-up event and the subaerial melting hydrology [16]. In another case in west Greenland, the orthomosaic product from UAV collections was utilized to delineate multiple structural features, including crevasse traces, debris covers, supraglacial channels, and flowlines [17].…”

Section: Introductionmentioning

confidence: 99%

UAV-Based Photogrammetry and LiDAR for the Characterization of Ice Morphology Evolution

Bao-gang

Xiao

et al. 2020

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Ice doline is a particular kind of ice morphology, usually scattered on ice streams which are mostly far from the existing research bases. For this reason, glaciologists rarely have opportunities to document its developments in detail. Satellite observations are too coarse to capture such fine features, whereas Unmanned Aerial Vehicle (UAV)-based Structure-from-Motion (SfM) and Light Detection and Ranging (LiDAR) technologies have revolutionized geosciences research, especially in less accessed polar regions. We developed two bespoke UAV systems for glaciological investigation and carried out four campaigns during two consecutive Chinese Antarctic expeditions in 2017 and 2018. Founded on manual co-registration and accuracy assessment, a successful application to characterize a doline's spatio-temporal evolution is presented in this paper. The overlying weight of surface melting directly triggered the collapse event on 30 Jan 2017 near the Dalk Glacier, then the newborn doline grew for another 8135.6 m 2 in area and 280303.38 m 3 in volume by early 2018. The UAV-based results revealed the doline's changes during a year, showing a maximum horizontal extension of 50 m and vertical subsidence of more than 10 m. Furthermore, we evaluate the photogrammetry and LiDAR systems and find the former is cost-effective and time-efficient on a large-scale survey while the latter enjoys a better capability to characterize ice morphological details. Based on systematic comparisons, other pros and cons of the two techniques are discussed. To achieve the best performance for relevant applications in similar scenarios, we recommend adopting an integrated approach, in which the LiDAR restores the fine features on the basis of extensive SfM coverage.

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Structural glaciology of Isunguata Sermia, West Greenland

Cited by 17 publications

References 55 publications

Applications of Unmanned Aerial Vehicles in Cryosphere: Latest Advances and Prospects

Applications of Unmanned Aerial Vehicles in Cryosphere: Latest Advances and Prospects

A Computational Design Analysis of UAV’s Rotor Blade in Low-Temperature Conditions for the Defence Applications

UAV-Based Photogrammetry and LiDAR for the Characterization of Ice Morphology Evolution

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