Unmanned Aerial Systems and DSM matching for rock glacier monitoring

Dall’Asta, E.; Forlani, G.; Roncella, R.; Santise, M.; Diotri, Fabrizio; Cella, Umberto Morra di

doi:10.1016/j.isprsjprs.2016.10.003

Cited by 70 publications

(54 citation statements)

References 34 publications

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“…One limit of this approach is the incomplete spatial coverage of terrestrial-based surveys, which leads to a lack of data in masked/hidden areas due to the limited view from the terrain. A good alternative could be, as proposed by [18], to use an unmanned aerial vehicle to produce a high resolution DEM that covers most of the study area.…”

Section: Limits and Perspectives Of The Methodsmentioning

confidence: 99%

“…In addition, their repetitivity can be annual or even at smaller time intervals, mostly depending on the terrain characteristics and the range of surface velocities. So far, these methods have rarely been used for rock glacier studies [17][18][19][20], and no investigations have yet addressed the potential of those methods for long-term monitoring of the surface kinematics.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Annual Kinematics of an Active Rock Glacier Quantified from Very High-Resolution DEMs: An Application-Case in the French Alps

et al. 2018

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Rock glaciers result from the long-term creeping of ice-rich permafrost along mountain slopes. Under warming conditions, deformation is expected to increase, and potential destabilization of those landforms may lead to hazardous phenomena. Monitoring the kinematics of rock glaciers at fine spatial resolution is required to better understand at which rate, where and how they deform. We present here the results of several years of in situ surveys carried out between 2005 and 2015 on the Laurichard rock glacier, an active rock glacier located in the French Alps. Repeated terrestrial laser-scanning (TLS) together with aerial laser-scanning (ALS) and structure-from-motion-multi-view-stereophotogrammetry (SFM-MVS) were used to accurately quantify surface displacement of the Laurichard rock glacier at interannual and pluri-annual scales. Six very high-resolution digital elevation models (DEMs, pixel size <50 cm) of the rock glacier surface were generated, and their respective quality was assessed. The relative horizontal position accuracy (XY) of the individual DEMs is in general less than 2 cm with a co-registration error on stable areas ranging from 20-50 cm. The vertical accuracy is around 20 cm. The direction and amplitude of surface displacements computed between DEMs are very consistent with independent geodetic field measurements (e.g., DGPS). Using these datasets, local patterns of the Laurichard rock glacier kinematics were quantified, pointing out specific internal (rheological) and external (bed topography) controls. The evolution of the surface velocity shows few changes on the rock glacier's snout for the first years of the observed period, followed by a major acceleration between 2012 and 2015 affecting the upper part of the tongue and the snout.

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Section: Limits and Perspectives Of The Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-Annual Kinematics of an Active Rock Glacier Quantified from Very High-Resolution DEMs: An Application-Case in the French Alps

et al. 2018

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“…Dall'Asta et al (2016) report about RMSE evaluated with respect of independent check points in the order of 4 cm and 7 cm for horizontal position and elevation, respectively.…”

Section: Uav With Gnss-rtk Positioningmentioning

confidence: 99%

Technical Aspects Related to the Application of SFM Photogrammetry in High Mountain

Scaioni¹,

Crippa²,

Corti³

et al. 2018

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Structure-from-Motion (SfM) photogrammetry is a flexible and powerful tool to provide 3D point clouds describing the surface of objects. Due to the easy transportability and low-cost of necessary equipment with respect to laser scanning techniques, SfM photogrammetry has great potential to be applied in harsh high-mountain environment. Here point clouds and derived by-products (DEM's, orthoimages, Virtual-Reality models) are needed to document surface morphology and to investigate dynamic processes such as landslides, avalanches, river and soil erosion, glacier retreat. On the other hand, from both the literature and the direct experience of the authors, there are some technical issues that still deserve thorough investigations. The paper would like to address some open problems and suggest solutions, in particular on regards of the photogrammetric network design, the strategy for georeferencing the final products, and for their comparison within time. The discussion is documented with some examples, mainly from surveying campaigns at the Forni Glacier in Italian Alps.

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“…Some examples related to the use of UAS solutions are reported in Solbø & Storvold (2013), Whitehead et al (2013), Immerzeel et al (2014), Tonkin et al (2014), Bülher et al (2015), Fugazza et al (2015), Ryan et al, (2015), Clapuyt et al (2016), Dall'Asta et al (2016), Kraaijenbrink et al (2016). In addition, Bhardwaj et al (2016) give an overview about the application of UAS in Glaciology.…”

Section: Sfm and Uas's For Glaciological Studiesmentioning

confidence: 99%

“…In the case of UAS flights, the employ of a GNSS-RTK sensor on-board may directly provide a sufficient quality exterior orientation. Dall'Asta et al (2016) report about RMSE in the order of 4 cm and 7 cm that have been evaluated for position and elevation, respectively.…”

Section: Accuracy Evaluationmentioning

confidence: 99%

Local and General Monitoring of Forni Glacier (Italian Alps) Using Multi-Platform Structure-From-Motion Photogrammetry

Scaioni

Corti

Diolaiuti

et al. 2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Experts from the University of Milan have been investigating Forni Glacier in the Italian alps for decades, resulting in the archive of a cumbersome mass of observed data. While the analysis of archive maps, medium resolution satellite images and DEM's may provide an overview of the long-term processes, the application of close-range sensing techniques offers the unprecedented opportunity to operate a 4D reconstruction of the glacier geometry at both global and local levels. In the latest years the availability of high-resolution DEM's from stereo-photogrammetry (2007) and UAV-photogrammetry (2014 and has allowed an improved analysis of the glacier ice-mass balance within time. During summer 2016 a methodology to record the local disruption processes has been investigated. The presence of vertical and sub-vertical surfaces has motivated the use of Structure-from-Motion Photogrammetry from ground-based stations, which yielded results comparable to the ones achieved using a long-range terrestrial laser scanner. This technique may be assumed as benchmarking for accuracy assessment, but is more difficult to be operated in high-mountain areas. Nevertheless, the measurement of GCP's for the terrestrial photogrammetric project has revealed to be a complex task, involving the need of a total station a GNSS. The effect of network geometry on the final output has also been investigated for SfM-Photogrammetry, considering the severe limitations implied in the Alpine environment.

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Unmanned Aerial Systems and DSM matching for rock glacier monitoring

Cited by 70 publications

References 34 publications

Multi-Annual Kinematics of an Active Rock Glacier Quantified from Very High-Resolution DEMs: An Application-Case in the French Alps

Multi-Annual Kinematics of an Active Rock Glacier Quantified from Very High-Resolution DEMs: An Application-Case in the French Alps

Technical Aspects Related to the Application of SFM Photogrammetry in High Mountain

Local and General Monitoring of Forni Glacier (Italian Alps) Using Multi-Platform Structure-From-Motion Photogrammetry

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