Experiences of Uav Surveys Applied to Environmental Risk Management

Caprioli, Mauro; Trizzino, R.; Mazzone, Francesco; Scarano, M.

doi:10.5194/isprs-archives-xli-b1-797-2016

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…The result for the wind eroded landform (site B1) ( Figure 12B) was quite different from site D, but this does not affect the trend of accuracy which decreased with an increase of the control point density. In site B1, the control point density of 42/km 2 is the best, which was consistent with the control point density of Caprioli et al (2016) using a UAV for 3D modelling in a coastal area.…”

Section: Controls On Error and Uncertainty In Sfm Outputssupporting

confidence: 80%

“…Furthermore, UAVs-SfM approaches allows the capture of high precision topographic data with lower economic and time costs compared with utilizing traditional satellite images and aerial photographs (Scarelli et al, 2017). Therefore, UAVs have been widely used in agriculture, forest management (Grenzdörffer et al, 2008), archaeology (Sauerbier and Eisenbeiss, 2010), urban planning (Yang, 2018;Zhang, 2018), biology (Li et al, 2019), hydrology (DeBell et al, 2015), earthquake (Valkaniotis et al, 2018), coastal (Gilham et al, 2019;Guisado-Pintado et al, 2019), environmental risk survey monitoring (Caprioli et al, 2016;Balek and Blahůt, 2017;Gindraux et al, 2017;Che et al, 2019) and other fields in recent years. However, application of this technique in the field of aeolian geomorphology has been comparatively modest and largely confined to coastal regions (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of UAVs‐SfM data collection in aeolian landform morphodynamics: a case study from the Gonghe Basin, China

Luo

Shao

Che

et al. 2020

Earth Surf Processes Landf

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UAVs-SfM (unmanned aerial vehicles-structure-from-motion) systems can generate high-resolution three-dimensional (3D) topographic models of aeolian landforms. To explore the optimization of UAVs-SfM for use in aeolian landform morphodynamics, this study tested flight parameters for two contrasting aeolian landform areas (free dune and blowout) to assess the 3D reconstruction accuracy of the UAV survey compared with field point measurements using differential RTK-GPS (real-time kinematic-global positioning system). The results reveal the optimum UAVs-SfM flight setup at the free-dune site was: flying height ¼ 74m, camera tilt angle ¼ À90°, photograph overlap ratio ¼ 85%/70% (heading/sideways). The horizontal/vertical location error was around 0.028-0.055m and 0.053-0.069m, respectively, and a point cloud density of 463/m 3 was found to generate a clear texture using these flying parameters. For the < 20m deep blowout the optimum setup with highest accuracy and the lowest cliff texture distortion was: flying height ¼ 74m combined camera tilt angle ¼ À90°and À60°, photograph overlap ratio ¼ 85%/70% (heading/ sideways), and an evenly distributed GCPs (ground control points) density of 42/km 2 using these flying parameters. When the depth of the blowouts exceeded 40m, the optimum flight/survey parameters changed slightly to account for more challenging cliff texture generation: flying height ¼ 80m (with À90°and À60°combined camera tilt angle), GCPs density ¼ 63/km 2 to generate horizontal and vertical location error of 0.024m and 0.050m, respectively, and point cloud density of 2597.11/m 3. The main external factors that affect the successful 3D reconstruction of aeolian landforms using UAVs-SfM are the weather conditions, manipulation errors, and instrument system errors. The UAVs-SfM topographic monitoring results demonstrate that UAVs provide a viable and robust means for aeolian landform morphodynamics monitoring. Importantly, the rapid and high precision 3D reconstruction processes were significantly advanced using the optimal flight parameters reported here.

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Section: Controls On Error and Uncertainty In Sfm Outputssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Optimization of UAVs‐SfM data collection in aeolian landform morphodynamics: a case study from the Gonghe Basin, China

Luo

Shao

Che

et al. 2020

Earth Surf Processes Landf

View full text Add to dashboard Cite

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“…During the last years the use of UAVs for aerial surveys is becoming a consolidated application, commonly used for obtaining 3D models of the outer side of buildings [4]. UAVs can be used as a precise, automated and computer-controlled data acquisition and measurement platform, as a result of low-cost sensors such as off-the-shelf digital cameras, GPS/INS (Global Positioning System / Inertial Navigation System) based stabilization and navigation units [5]. In cultural heritage area UAV applications are mainly focused on documentation, observation, monitoring, mapping, 3D modelling and 3D reconstruction [6] as well as digital maps, digital orthophoto, digital elevation model (DEM) and digital surface models (DSM) [7].…”

Section: Uav Mappingmentioning

confidence: 99%

“…In cultural heritage area UAV applications are mainly focused on documentation, observation, monitoring, mapping, 3D modelling and 3D reconstruction [6] as well as digital maps, digital orthophoto, digital elevation model (DEM) and digital surface models (DSM) [7]. UAV aerial imagery in combination with photogrammetry are emerging technologies providing an innovative approach to 3D documentation of cultural heritage [5]. In this study, a DJI Mavic 2 Pro with a 1-inch CMOS 20 MP Hasselblad L1D-20c camera was used in order to take images with 90% overlap around the church.…”

Section: Uav Mappingmentioning

confidence: 99%

The documentation of ecclesiastical cultural heritage sites in Cyprus

Themistocleous

Evagorou

Mettas

et al. 2020

Earth Resources and Environmental Remote Sensing/Gis Applications XI

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Innovative digital applications are invaluable for the documentation and conservation of cultural heritage monuments. Digital techniques can provide data on cultural heritage sites to enhance understanding of their changes over time. Due to the age and conditions of cultural heritage monuments in Cyprus, especially churches, there is a great demand to develop a methodology that is capable of digitizing both the internal and external church using a variety of non-invasive techniques as a means of storing and managing documentation data and metadata for providing comprehensive culturally digital and documentation evidence. In this paper, the integration of various technologies was used to document the 12 th century St. Efstathios Chapel in Kolossi, Cyprus. The methodologies included data acquired by close-range images from Unmanned Aerial Vehicles (UAVs) and hand-held cameras, coordinates from ground control points using Total Stations etc., to document both the internal and external facades and relics of selected religious monuments. Thousands of images from the monument were taken using a UAV with a high-resolution camera. The images were processed using photogrammetry to provide a digital model of the church. The use of the HSV color model was used to examine potential anomalies in the structure. The combination of the technologies will provide a 3D model to document and identify ecclesiastical cultural heritage sites, which can be incorporated into a dynamic database and valuable resource to better understand the cultural heritage monument. In this way, the end-users will be able to access the information from the digital platform at any time.

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Multi-scale approach to analyse the evolution of soft rock coastal cliffs and role of controlling factors: a case study in South-Eastern Italy

Lollino

Pagliarulo

Trizzino

et al. 2021

Geomatics, Natural Hazards and Risk

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The evolution of soft rock coastlines is strictly related to natural and anthropogenic conditions, which in some cases can determine also an acceleration of coastal retreat. The recent evolution of a soft rocky coastal stretch on the Italian southern Adriatic sector is analysed. To investigate the most important contributing factors to coastal evolution, a detailed multi-temporal (1954-2017) morphological analysis with photo-interpretation is carried out, which allows gaining a general understanding of the cliff evolution. The coastal retreat was then evaluated by exploiting the Digital Shoreline Analysis System (DSAS) tool. From that, site-specific analyses are carried out to explore the role of four environmental factors: rock mechanical properties, geostructural setup of the rock mass along the coast, emerged rock platform at the toe, and the storm waves. Analyses highlighted how the most significant retreat is detected along cliff segments characterized by the presence of low strength rocks susceptible to waterinduced weakening, moderate fracturing degree of the rock mass, absence of the emerged platform at the toe, and wave storms. This work shows how a multi-scale methodology could represent an efficient approach to gain an interpretation of the instability processes and thus prepare risk mitigation plans and land management strategies.

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Experiences of Uav Surveys Applied to Environmental Risk Management

Cited by 4 publications

References 3 publications

Optimization of UAVs‐SfM data collection in aeolian landform morphodynamics: a case study from the Gonghe Basin, China

Optimization of UAVs‐SfM data collection in aeolian landform morphodynamics: a case study from the Gonghe Basin, China

The documentation of ecclesiastical cultural heritage sites in Cyprus

Multi-scale approach to analyse the evolution of soft rock coastal cliffs and role of controlling factors: a case study in South-Eastern Italy

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