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https://www.readbyqxmd.com/read/29047778/low-cost-dynamic-real-time-foveated-imager
#1
Yajun Niu, Jun Chang, Fengxiang Lv, Benlan Shen, Weilin Chen
Foveated imaging systems have the ability to capture local high-resolution or high-magnification images with wide field of view (FOV); thus, they have great potential for applications in the field of monitoring and remote sensing of unmanned aerial vehicles. Hence, foveated optical systems are in strong demand. However, the existing foveated imaging systems either are equipped with expensive modulators or require fixing the local high resolution imaging field, which is not suitable for mass production or object tracking in industrial applications...
October 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29043046/among-tree-variability-and-feedback-effects-result-in-different-growth-responses-to-climate-change-at-the-upper-treeline-in-the-swiss-alps
#2
Matthias Jochner, Harald Bugmann, Magdalena Nötzli, Christof Bigler
Upper treeline ecotones are important life form boundaries and particularly sensitive to a warming climate. Changes in growth conditions at these ecotones have wide-ranging implications for the provision of ecosystem services in densely populated mountain regions like the European Alps. We quantify climate effects on short- and long-term tree growth responses, focusing on among-tree variability and potential feedback effects. Although among-tree variability is thought to be substantial, it has not been considered systematically yet in studies on growth-climate relationships...
October 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29041379/surface-deformation-recovery-algorithm-for-reflector-antennas-based-on-geometric-optics
#3
Jianhui Huang, Huiliang Jin, Qian Ye, Guoxiang Meng
Surface deformations of large reflector antennas highly depend on elevation angle. This paper adopted a scheme with the ability to conduct measurement at any elevation angle: carrying an emission source, an unmanned aerial vehicle (UAV) scans the antenna on a near-field plane, meanwhile the antenna stays stationary. Near-field amplitude is measured in the scheme. To recover the deformation from the measured amplitude, this paper proposed a novel algorithm by deriving the deformation-amplitude equation, which reveals the relation between the surface deformation and the near-field amplitude...
October 2, 2017: Optics Express
https://www.readbyqxmd.com/read/29039755/comparing-riegl-ricopter-uav-lidar-derived-canopy-height-and-dbh-with-terrestrial-lidar
#4
Benjamin Brede, Alvaro Lau, Harm M Bartholomeus, Lammert Kooistra
In recent years, LIght Detection And Ranging (LiDAR) and especially Terrestrial Laser Scanning (TLS) systems have shown the potential to revolutionise forest structural characterisation by providing unprecedented 3D data. However, manned Airborne Laser Scanning (ALS) requires costly campaigns and produces relatively low point density, while TLS is labour intense and time demanding. Unmanned Aerial Vehicle (UAV)-borne laser scanning can be the way in between. In this study, we present first results and experiences with the RIEGL RiCOPTER with VUX ® -1UAV ALS system and compare it with the well tested RIEGL VZ-400 TLS system...
October 17, 2017: Sensors
https://www.readbyqxmd.com/read/29036930/automatic-hotspot-and-sun-glint-detection-in-uav-multispectral-images
#5
Damian Ortega-Terol, David Hernandez-Lopez, Rocio Ballesteros, Diego Gonzalez-Aguilera
Last advances in sensors, photogrammetry and computer vision have led to high-automation levels of 3D reconstruction processes for generating dense models and multispectral orthoimages from Unmanned Aerial Vehicle (UAV) images. However, these cartographic products are sometimes blurred and degraded due to sun reflection effects which reduce the image contrast and colour fidelity in photogrammetry and the quality of radiometric values in remote sensing applications. This paper proposes an automatic approach for detecting sun reflections problems (hotspot and sun glint) in multispectral images acquired with an Unmanned Aerial Vehicle (UAV), based on a photogrammetric strategy included in a flight planning and control software developed by the authors...
October 15, 2017: Sensors
https://www.readbyqxmd.com/read/29027244/unmanned-aerial-vehicles-in-construction-and-worker-safety
#6
John Howard, Vladimir Murashov, Christine M Branche
Applications of unmanned aerial vehicles (UAVs) for military, recreational, public, and commercial uses have expanded significantly in recent years. In the construction industry, UAVs are used primarily for monitoring of construction workflow and job site logistics, inspecting construction sites to assess structural integrity, and for maintenance assessments. As is the case with other emerging technologies, occupational safety assessments of UAVs lag behind technological advancements. UAVs may create new workplace hazards that need to be evaluated and managed to ensure their safe operation around human workers...
October 13, 2017: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/29021803/uav-based-thermal-imaging-for-high-throughput-field-phenotyping-of-black-poplar-response-to-drought
#7
Riccardo Ludovisi, Flavia Tauro, Riccardo Salvati, Sacha Khoury, Giuseppe Mugnozza Scarascia, Antoine Harfouche
Poplars are fast-growing, high-yielding forest tree species, whose cultivation as second-generation biofuel crops is of increasing interest and can efficiently meet emission reduction goals. Yet, breeding elite poplar trees for drought resistance remains a major challenge. Worldwide breeding programs are largely focused on intra/interspecific hybridization, whereby Populus nigra L. is a fundamental parental pool. While high-throughput genotyping has resulted in unprecedented capabilities to rapidly decode complex genetic architecture of plant stress resistance, linking genomics to phenomics is hindered by technically challenging phenotyping...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29019957/application-of-multilayer-perceptron-with-automatic-relevance-determination-on-weed-mapping-using-uav-multispectral-imagery
#8
Afroditi A Tamouridou, Thomas K Alexandridis, Xanthoula E Pantazi, Anastasia L Lagopodi, Javid Kashefi, Dimitris Kasampalis, Georgios Kontouris, Dimitrios Moshou
Remote sensing techniques are routinely used in plant species discrimination and of weed mapping. In the presented work, successful Silybum marianum detection and mapping using multilayer neural networks is demonstrated. A multispectral camera (green-red-near infrared) attached on a fixed wing unmanned aerial vehicle (UAV) was utilized for the acquisition of high-resolution images (0.1 m resolution). The Multilayer Perceptron with Automatic Relevance Determination (MLP-ARD) was used to identify the S. marianum among other vegetation, mostly Avena sterilis L...
October 11, 2017: Sensors
https://www.readbyqxmd.com/read/28974050/correction-domingues-franceschini-m-h-et-al-intercomparison-of-unmanned-aerial-vehicle-and-ground-based-narrow-band-spectrometers-applied-to-crop-trait-monitoring-in-organic-potato-production-sensors-2017-17-1428
#9
Marston Héracles Domingues Franceschini, Harm Bartholomeus, Dirk van Apeldoorn, Juha Suomalainen, Lammert Kooistra
The authors would like to correct Figure 13 and Table A2, as well as the text related to the data presented in both of them, as indicated below, considering that an error in the calculations involving Equation (2), described in the Section 2.8 of the Materials and Methods Section, resulted in the communication of incorrect values [...].
October 2, 2017: Sensors
https://www.readbyqxmd.com/read/28974041/brillouin-optical-correlation-domain-analysis-in-composite-material-beams
#10
Yonatan Stern, Yosef London, Eyal Preter, Yair Antman, Hilel Hagai Diamandi, Maayan Silbiger, Gadi Adler, Eyal Levenberg, Doron Shalev, Avi Zadok
Structural health monitoring is a critical requirement in many composites. Numerous monitoring strategies rely on measurements of temperature or strain (or both), however these are often restricted to point-sensing or to the coverage of small areas. Spatially-continuous data can be obtained with optical fiber sensors. In this work, we report high-resolution distributed Brillouin sensing over standard fibers that are embedded in composite structures. A phase-coded, Brillouin optical correlation domain analysis (B-OCDA) protocol was employed, with spatial resolution of 2 cm and sensitivity of 1 °K or 20 micro-strain...
October 2, 2017: Sensors
https://www.readbyqxmd.com/read/28961219/a-novel-online-data-driven-algorithm-for-detecting-uav-navigation-sensor-faults
#11
Rui Sun, Qi Cheng, Guanyu Wang, Washington Yotto Ochieng
The use of Unmanned Aerial Vehicles (UAVs) has increased significantly in recent years. On-board integrated navigation sensors are a key component of UAVs' flight control systems and are essential for flight safety. In order to ensure flight safety, timely and effective navigation sensor fault detection capability is required. In this paper, a novel data-driven Adaptive Neuron Fuzzy Inference System (ANFIS)-based approach is presented for the detection of on-board navigation sensor faults in UAVs. Contrary to the classic UAV sensor fault detection algorithms, based on predefined or modelled faults, the proposed algorithm combines an online data training mechanism with the ANFIS-based decision system...
September 29, 2017: Sensors
https://www.readbyqxmd.com/read/28961198/detection-of-nuclear-sources-by-uav-teleoperation-using-a-visuo-haptic-augmented-reality-interface
#12
Jacopo Aleotti, Giorgio Micconi, Stefano Caselli, Giacomo Benassi, Nicola Zambelli, Manuele Bettelli, Andrea Zappettini
A visuo-haptic augmented reality (VHAR) interface is presented enabling an operator to teleoperate an unmanned aerial vehicle (UAV) equipped with a custom CdZnTe-based spectroscopic gamma-ray detector in outdoor environments. The task is to localize nuclear radiation sources, whose location is unknown to the user, without the close exposure of the operator. The developed detector also enables identification of the localized nuclear sources. The aim of the VHAR interface is to increase the situation awareness of the operator...
September 29, 2017: Sensors
https://www.readbyqxmd.com/read/28956839/adaptation-of-dubins-paths-for-uav-ground-obstacle-avoidance-when-using-a-low-cost-on-board-gnss-sensor
#13
Ramūnas Kikutis, Jonas Stankūnas, Darius Rudinskas, Tadas Masiulionis
Current research on Unmanned Aerial Vehicles (UAVs) shows a lot of interest in autonomous UAV navigation. This interest is mainly driven by the necessity to meet the rules and restrictions for small UAV flights that are issued by various international and national legal organizations. In order to lower these restrictions, new levels of automation and flight safety must be reached. In this paper, a new method for ground obstacle avoidance derived by using UAV navigation based on the Dubins paths algorithm is presented...
September 28, 2017: Sensors
https://www.readbyqxmd.com/read/28954702/evaluation-of-the-use-of-very-high-resolution-aerial-imagery-for-accurate-ice-wedge-polygon-mapping-adventdalen-svalbard
#14
Maura Lousada, Pedro Pina, Gonçalo Vieira, Lourenço Bandeira, Carla Mora
The main objective of this paper is to verify the accuracy of delineating and characterizing ice-wedge polygonal networks with features exclusively extracted from remotely sensed images of very high resolution. This kind of mapping plays a key role for quantifying ice-wedge degradation in warming permafrost. The evaluation of mapping a network is performed in this study with two sets of aerial images that are compared to ground reference data determined by fieldwork on the same network, located in Adventdalen, Svalbard (78°N)...
September 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28954434/towards-a-transferable-uav-based-framework-for-river-hydromorphological-characterization
#15
Mónica Rivas Casado, Rocío Ballesteros González, José Fernando Ortega, Paul Leinster, Ros Wright
The multiple protocols that have been developed to characterize river hydromorphology, partly in response to legislative drivers such as the European Union Water Framework Directive (EU WFD), make the comparison of results obtained in different countries challenging. Recent studies have analyzed the comparability of existing methods, with remote sensing based approaches being proposed as a potential means of harmonizing hydromorphological characterization protocols. However, the resolution achieved by remote sensing products may not be sufficient to assess some of the key hydromorphological features that are required to allow an accurate characterization...
September 26, 2017: Sensors
https://www.readbyqxmd.com/read/28951735/multi-spectral-imaging-from-an-unmanned-aerial-vehicle-enables-the-assessment-of-seasonal-leaf-area-dynamics-of-sorghum-breeding-lines
#16
Andries B Potgieter, Barbara George-Jaeggli, Scott C Chapman, Kenneth Laws, Luz A Suárez Cadavid, Jemima Wixted, James Watson, Mark Eldridge, David R Jordan, Graeme L Hammer
Genetic improvement in sorghum breeding programs requires the assessment of adaptation traits in small-plot breeding trials across multiple environments. Many of these phenotypic assessments are made by manual measurement or visual scoring, both of which are time consuming and expensive. This limits trial size and the potential for genetic gain. In addition, these methods are typically restricted to point estimates of particular traits, such as leaf senescence or flowering and do not capture the dynamic nature of crop growth...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28946659/secure-utilization-of-beacons-and-uavs-in-emergency-response-systems-for-building-fire-hazard
#17
Seung-Hyun Seo, Jung-In Choi, Jinseok Song
An intelligent emergency system for hazard monitoring and building evacuation is a very important application area in Internet of Things (IoT) technology. Through the use of smart sensors, such a system can provide more vital and reliable information to first-responders and also reduce the incidents of false alarms. Several smart monitoring and warning systems do already exist, though they exhibit key weaknesses such as a limited monitoring coverage and security, which have not yet been sufficiently addressed...
September 25, 2017: Sensors
https://www.readbyqxmd.com/read/28946639/towards-the-automatic-detection-of-pre-existing-termite-mounds-through-uas-and-hyperspectral-imagery
#18
Juan Sandino, Adam Wooler, Felipe Gonzalez
The increased technological developments in Unmanned Aerial Vehicles (UAVs) combined with artificial intelligence and Machine Learning (ML) approaches have opened the possibility of remote sensing of extensive areas of arid lands. In this paper, a novel approach towards the detection of termite mounds with the use of a UAV, hyperspectral imagery, ML and digital image processing is intended. A new pipeline process is proposed to detect termite mounds automatically and to reduce, consequently, detection times...
September 24, 2017: Sensors
https://www.readbyqxmd.com/read/28946606/uncooled-thermal-camera-calibration-and-optimization-of-the-photogrammetry-process-for-uav-applications-in-agriculture
#19
Krishna Ribeiro-Gomes, David Hernández-López, José F Ortega, Rocío Ballesteros, Tomás Poblete, Miguel A Moreno
The acquisition, processing, and interpretation of thermal images from unmanned aerial vehicles (UAVs) is becoming a useful source of information for agronomic applications because of the higher temporal and spatial resolution of these products compared with those obtained from satellites. However, due to the low load capacity of the UAV they need to mount light, uncooled thermal cameras, where the microbolometer is not stabilized to a constant temperature. This makes the camera precision low for many applications...
September 23, 2017: Sensors
https://www.readbyqxmd.com/read/28941951/on-decentralized-adaptive-full-order-sliding-mode-control-of-multiple-uavs
#20
Xianbo Xiang, Chao Liu, Housheng Su, Qin Zhang
In this study, a novel decentralized adaptive full-order sliding mode control framework is proposed for the robust synchronized formation motion of multiple unmanned aerial vehicles (UAVs) subject to system uncertainty. First, a full-order sliding mode surface in a decentralized manner is designed to incorporate both the individual position tracking error and the synchronized formation error while the UAV group is engaged in building a certain desired geometric pattern in three dimensional space. Second, a decentralized virtual plant controller is constructed which allows the embedded low-pass filter to attain the chattering free property of the sliding mode controller...
September 20, 2017: ISA Transactions
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