Spatial Data Performance Test of Mid-cost UAS with Direct Georeferencing

Kordić, Branko; Gašparović, Mateo; Oberiter, Borna Lužar; Đapo, Almin; Vlastelica, Goran

doi:10.3311/ppci.15619

Cited by 4 publications

(10 citation statements)

References 28 publications

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“…A customised VTOL (Vertical TakeOff and Landing) UAV multirotor system (see Figure 5) is used as the aerial platform for all flights of our test process. The system consists of a carbon fibre tube frame with a radial array of motors powered by a high capacity Lithium Polymer (LiPo) battery [41]. The total weight of the system is about 3.6 kg, which classifies it as a micro aerial vehicle (MAV) weighing less than 5 kg.…”

Section: Unmanned Aerial Vehiclementioning

confidence: 99%

“…), which includes additional sensors such as gyroscopes, accelerometers, 3-axis magnetometer and barometer for navigation support. The reason for using the multirotor VTOL is its ability to acquire images from different positions, its applicability in many specific tasks, the possibility of take-off and landing with the minimum required area, as well as its flight stability and operation at lower altitudes compared to light fixed-wing systems without VTOL [41].…”

Section: Unmanned Aerial Vehiclementioning

confidence: 99%

“…This also eliminates a potential source of interference in the link that can occur during the RTK solution. The reduction of external effects increases the reliability of the system [41].…”

Section: Uav Positioning Systemmentioning

confidence: 99%

“…It is then possible to postprocess the data together with the rover data to obtain the 3D trajectory and coordinates of the events with high spatial accuracy. These coordinates represent the initial position of the captured images [41].…”

Section: Uav Positioning Systemmentioning

confidence: 99%

“…Phototriangulation with the self-calibration method was used to determine the parameters of the internal orientation. The phototriangulation was calculated with the BBA method (Bundle Block Adjustment) using Pix4D v4.5 software [41].…”

Section: Uav Cameramentioning

confidence: 99%

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Autonomous Vehicles Mapping Plitvice Lakes National Park, Croatia

et al. 2020

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Plitvice Lakes National Park is the largest national park in Croatia and also the oldest from 1949. It was added to the UNESCO World Natural Heritage List in 1979, due to the unique physicochemical and biological conditions that have led to the creation of 16 named and several smaller unnamed lakes, which are cascading one into the next. Previous scientific research proved that the increased amount of dissolved organic matter (pollution) stops the travertine processes on Plitvice Lakes. Therefore, this complex, dynamic but also fragile geological, biological and hydrological system required a comprehensive limnological survey. Thirteen of the sixteen lakes mentioned above were initially surveyed from the air by an unmanned aircraft equipped with a survey grade GNSS and a full frame high-resolution full-screen camera. From these recordings, a georeferenced, high-resolution orthophoto was generated, on which the following surveys by a multibeam sonar depended. It is important to mention that this was the first time that these lakes had ever been surveyed both with the multibeam sonar technique and with such a high-resolution camera. Due to the fact that these thirteen lakes are difficult to reach and often too shallow for a boat-mounted sonar, a special autonomous surface vehicle was developed. The lakes were surveyed by the autonomous surface vehicle mounted with a multibeam sonar to create detailed bathymetric models of the lakes. The missions were planned for the surface vehicle based on the orthophoto from the preliminary studies. A detailed description of the methodology used to survey the different lakes is given here. In addition, the resulting high-resolution bathymetric maps are presented and analysed together with an overview of average, maximum depths and number of data points. Numerous interesting depressions, which are phenomena consistent with previous studies of Plitvice Lakes, are noted at the lake beds and their causes are discussed. This study shows the huge potential of remote sensing technologies integrated into autonomous vehicles in terms of much faster surveys, several orders of magnitude more data points (compared to manual surveys of a few decades ago), as well as data accuracy, precision and georeferencing.

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Section: Unmanned Aerial Vehiclementioning

confidence: 99%

Section: Unmanned Aerial Vehiclementioning

confidence: 99%

“…This also eliminates a potential source of interference in the link that can occur during the RTK solution. The reduction of external effects increases the reliability of the system [41].…”

Section: Uav Positioning Systemmentioning

confidence: 99%

Section: Uav Positioning Systemmentioning

confidence: 99%

Section: Uav Cameramentioning

confidence: 99%

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Autonomous Vehicles Mapping Plitvice Lakes National Park, Croatia

et al. 2020

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A Review of Emerging Technologies for an Assessment of Safety and Seismic Vulnerability and Damage Detection of Existing Masonry Structures

Stepinac

Gašparović

2020

Applied Sciences

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The construction sector has proven to be one of the slowest sectors to embrace technology—a problem that must be addressed. This problem can be quickly and efficiently addressed in certain aspects of seismic engineering: from seismic risk assessment to damage detection, as well as condition assessments existing structures before or after an earthquake. In this paper, the literature review of assessment methods and damage detection technologies for existing (mainly) masonry structures is presented. Traditional methods are briefly explained, and modern are critically discussed. Special focus is given to unmanned aerial vehicles, as well as, photogrammetry and close-range remote sensing as a technology that can complement traditional ways of assessment and give us data about a structure that is often different to obtain. Graphical interpretation of one post-earthquake case study is provided. Open challenges and opportunities of emerging technologies for faster and easier assessment of seismic safety and vulnerability are presented.

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Analysis of the Possible Reactivation of the Krbavčići Landslide in Northern Istria, Croatia

Prodan¹,

Arbanas²

2020

Geosciences

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The Krbavčići landslide occurred in January 1979 near the town of Buzet, Croatia, after a long period of heavy rainfall. It is located in Northern Istria in the area built of flysch rock mass where numerous mass movements in the past and recent history have been recorded. A flysch rock mass is highly susceptible to weathering, which leads to material disintegration, changes in geotechnical properties, and shear strength decrease, finally resulting in instability processes in flysch slopes. This paper describes existing information about the Krbavčići landslide occurrence, laboratory testing of siltstone samples from a flysch rock mass, and numerical slope stability analyses of a possible landslide reactivation caused by possible long rainy periods and further weathering of the flysch rock mass. Slope stability analysis using the Rocscience, Slide software, as well as landslide numerical simulations using the LS-Rapid simulation software were performed on the basis of the digital elevation model (DEM) and laboratory test results of siltstones with different weathering grades. A DEM of the Krbavčići landslide was obtained on the basis of the unmanned aerial vehicle (UAV) survey conducted in March 2016. The residual shear strength of siltstones to predict a reactivation of landslides is of highest importance and was determined by ring shear and direct shear tests on siltstone samples with different weathering grades. The results of the numerical simulations show that an increase of the groundwater level in the landslide body in combination with the further weathering of the flysch rock material at the sliding surface would have the main influence on a possible landslide reactivation and the further development of the landslide displacement.

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Spatial Data Performance Test of Mid-cost UAS with Direct Georeferencing

Cited by 4 publications

References 28 publications

Autonomous Vehicles Mapping Plitvice Lakes National Park, Croatia

Autonomous Vehicles Mapping Plitvice Lakes National Park, Croatia

A Review of Emerging Technologies for an Assessment of Safety and Seismic Vulnerability and Damage Detection of Existing Masonry Structures

Analysis of the Possible Reactivation of the Krbavčići Landslide in Northern Istria, Croatia

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