UAV-Based Multitemporal Remote Sensing Surveys of Volcano Unstable Flanks: A Case Study from Stromboli

被引:6
|
作者
Gracchi, Teresa [1 ]
Stefanelli, Carlo Tacconi [1 ]
Rossi, Guglielmo [2 ]
Di Traglia, Federico [3 ]
Nolesini, Teresa [2 ]
Tanteri, Luca [2 ]
Casagli, Nicola [1 ,3 ]
机构
[1] Univ Florence, Earth Sci Dept, I-50121 Florence, Italy
[2] Univ Florence, Civil Protect Ctr, I-50125 Florence, Italy
[3] Natl Inst Oceanog & Appl Geophys OGS, I-34010 Trieste, Italy
关键词
UAV; photogrammetry; Stromboli; volcano; remote sensing; multitemporal survey; LAVA FLOW; LANDSLIDES; EVOLUTION; TSUNAMIS; ISLANDS;
D O I
10.3390/rs14102489
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
UAV-based photogrammetry is becoming increasingly popular even in application fields that, until recently, were deemed unsuitable for this technique. Depending on the characteristics of the investigated scenario, the generation of three-dimensional (3D) topographic models may in fact be affected by significant inaccuracies unless site-specific adaptations are implemented into the data collection and processing routines. In this paper, an ad hoc procedure to exploit high-resolution aerial photogrammetry for the multitemporal analysis of the unstable Sciara del Fuoco (SdF) slope at Stromboli Island (Italy) is presented. Use of the technique is inherently problematic because of the homogeneous aspect of the gray ash slope, which prevents a straightforward identification of match points in continuous frames. Moreover, due to site accessibility restrictions enforced by local authorities after the volcanic paroxysm in July 2019, Ground Control Points (GCPs) cannot be positioned to constrain georeferencing. Therefore, all 3D point clouds were georeferenced using GCPs acquired in a 2019 (pre-paroxysm) survey, together with stable Virtual Ground Control Points (VGCPs) belonging to a LiDAR survey carried out in 2012. Alignment refinement was then performed by means of an iterative algorithm based on the closest points. The procedure succeeded in correctly georeferencing six high-resolution point clouds acquired from April 2017 to July 2021, whose time-focused analysis made it possible to track several geomorphological structures associated with the continued volcanic activity. The procedure can be further extended to smaller-scale analyses such as the estimation of locally eroded/accumulated volumes and pave the way for rapid UAV-based georeferenced surveys in emergency conditions at the SdF.
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页数:17
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