scholarly journals Thermokarst Development Detected from High-Definition Topographic Data in Central Yakutia

2018 ◽  
Vol 10 (10) ◽  
pp. 1579 ◽  
Author(s):  
Hitoshi Saito ◽  
Yoshihiro Iijima ◽  
Nikolay Basharin ◽  
Alexander Fedorov ◽  
Viktor Kunitsky
Keyword(s):  
Arable Land ◽  
Average Diameter ◽  
Unmanned Aerial Systems ◽  
High Definition ◽  
Lena River ◽  
Topographic Data ◽  
Central Yakutia ◽  
Air Temperatures ◽  
The Right ◽  
Aerial Systems

Eastern Siberia is characterized by widespread permafrost thawing and subsequent thermokarst development. Estimation of the impacts of the predicted rise in precipitation and air temperatures under climate change requires quantitative knowledge about the spatial distribution of thermokarst development. In the last few years, unmanned aerial systems (UAS) and structure-from-motion multi-view stereo (SfM-MVS) photogrammetry attracted a tremendous amount of interest for acquiring high-definition topographic data. This study detected characteristics of thermokarst landforms using UAS and SfM-MVS photogrammetry at a disused airfield (3.0 ha) and for arable land that was previously used for farming (6.3 ha) in the Churapcha area, located on the right bank of the Lena River in central Yakutia. Orthorectified photographs and digital terrain models with spatial resolutions of 4.0 cm and 8.0 cm, respectively, were obtained for this study. At the disused airfield site and the abandoned arable land, 174 and 867 high-centered polygons that developed after the 1990s were detected, respectively. The data showed that the average diameter and average area of the polygons at the disused airfield site were 11.6 m and 111.2 m2, respectively, while those of the polygons in the abandoned arable land were 7.4 m and 46.8 m2, respectively. The abandoned arable land was characterized by smaller polygons and a higher polygon density. The differences in polygon size for the abandoned arable land and the disused airfield site indicate a difference in the ice wedge distributions and thermokarst developments. The subsidence rate was estimated as 2.1 cm/year for the disused airfield site and 3.9 cm/year for the abandoned arable land.

Marine mammal sightings by analysts of digital imagery versus aerial surveyors: a preliminary comparison

2013 ◽  
Vol 01 (01) ◽  
pp. 25-40 ◽  
Author(s):  
William R. Koski ◽  
Tannis A. Thomas ◽  
Dale W. Funk ◽  
A. Michael Macrander
Keyword(s):  
Marine Mammals ◽  
Additional Data ◽  
Unmanned Aerial Systems ◽  
High Definition ◽  
Detection Rates ◽  
Detailed Review ◽  
Full Resolution ◽  
Single Lens ◽  
Slide Show ◽  
Aerial Systems

Sightings of marine mammals made by protected species observers (PSOs) on manned aircraft were compared to sightings obtained from later review of high-definition (HD) video and digital single lens reflex (DSLR) camera imagery covering the same swaths and collected concurrent with the PSO observations. If the data were comparable, future similar surveys could be conducted with unmanned aerial systems or manned aircraft without PSOs. Two reviews were conducted on the DSLR images: one used image enhancement and scanned the images at full resolution of the cameras (detailed review) and the other flashed images at one ninth resolution on monitors for three to four seconds using a slide show format to simulate the view a PSO would have out an airplane window. Image reviewers saw fewer animals in HD video than did PSOs but sample sizes were small. During detailed review of DSLR imagery, reviewers saw similar numbers of cetaceans and polar bears and slightly more pinnipeds as compared to PSOs. PSOs saw more animals than the quick review found, but changes to the quick review process are suggested that will increase detection rates. Additional data are required to confirm the results presented here and to determine whether photographic versus PSO detections are similar across varying survey conditions.

scholarly journals A Practitioner’s Guide to Small Unmanned Aerial Systems for Bridge Inspection

2019 ◽  
Vol 4 (4) ◽  
pp. 72
Author(s):  
Sattar Dorafshan ◽  
Robert J. Thomas ◽  
Calvin Coopmans ◽  
Marc Maguire
Keyword(s):  
The United States ◽  
Emerging Technology ◽  
Unmanned Aerial Systems ◽  
Unmanned Aerial System ◽  
Bridge Inspection ◽  
Bridge Inspections ◽  
The Right ◽  
Aerial Systems ◽  
Departments Of Transportation ◽  
Selection Of

Small unmanned aerial system(s) (sUAS) are rapidly emerging as a practical means of performing bridge inspections. Under the right condition, sUAS assisted inspections can be safer, faster, and less costly than manned inspections. Many Departments of Transportation in the United States are in the early stages of adopting this emerging technology. However, definitive guidelines for the selection of equipment for various types of bridge inspections or for the possible challenges during sUAS assisted inspections are absent. Given the large investments of time and capital associated with deploying a sUAS assisted bridge inspection program, a synthesis of authors experiences will be useful for technology transfer between academics and practitioners. In this paper, the authors list the challenges associated with sUAS assisted bridge inspection, discuss equipment and technology options suitable for mitigating these challenges, and present case studies for the application of sUAS to several specific bridge inspection scenarios. The authors provide information to sUAS designers and manufacturers who may be unaware of the specific challenges associated with sUAS assisted bridge inspection. As such, the information presented here may reveal the demands in the design of purpose-built sUAS inspection platforms.

scholarly journals Regulation of Unmanned Aerial Systems and Related Privacy Issues in Lithuania

2017 ◽  
Vol 10 (2) ◽  
pp. 107-132
Author(s):  
Aurelija Pūraitė ◽  
Daiva Bereikienė ◽  
Neringa Šilinskė
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Unmanned Aerial Systems ◽  
Privacy Concerns ◽  
The Right To Privacy ◽  
Aerial Vehicles ◽  
Aerial Vehicle ◽  
The Republic ◽  
The Right ◽  
Aerial Systems ◽  
Privacy Issues

Abstract In the past few years the use of unmanned aerial vehicles in Lithuania has significantly increased. However, enjoying the advantages of this technology, which improves society’s socio-economical safety (public safety in a broad sense), raises some privacy concerns. This article analyses European Union and national legal regulations regarding the use of unmanned aerial vehicles as well as legal tools for defence of the right to privacy or prevention from its breaches in the Republic of Lithuania. Unmanned aerial vehicles have become popular only recently; thus, legislation regarding their use has not yet become a common topic among lawyers. Furthermore, case law of the Republic of Lithuania is silent about it. Thus, the authors model a situation of breach of privacy using an unmanned aerial vehicle and analyse possible defence mechanisms.

LIGHTER-THAN-AIR (LTA) UNMANNED AERIAL SYSTEM (UAS) CARRIER CONCEPT FOR SURVAILLANCE AND DISASTER MANAGEMENT

2019 ◽  
Vol 3 ◽  
pp. 1255
Author(s):  
Ahmad Salahuddin Mohd Harithuddin ◽  
Mohd Fazri Sedan ◽  
Syaril Azrad Md Ali ◽  
Shattri Mansor ◽  
Hamid Reza Jifroudi ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Disaster Management ◽  
Unmanned Aerial Systems ◽  
Unmanned Aerial System ◽  
Border Control ◽  
Aerial Vehicles ◽  
Operational Safety ◽  
In Situ Methods ◽  
Aerial Systems

Unmanned aerial systems (UAS) has many advantages in the fields of SURVAILLANCE and disaster management compared to space-borne observation, manned missions and in situ methods. The reasons include cost effectiveness, operational safety, and mission efficiency. This has in turn underlined the importance of UAS technology and highlighted a growing need in a more robust and efficient unmanned aerial vehicles to serve specific needs in SURVAILLANCE and disaster management. This paper first gives an overview on the framework for SURVAILLANCE particularly in applications of border control and disaster management and lists several phases of SURVAILLANCE and service descriptions. Based on this overview and SURVAILLANCE phases descriptions, we show the areas and services in which UAS can have significant advantage over traditional methods.

Reliability of Analytically Redundant Systems for Small Unmanned Aerial Systems

2021 ◽  
Author(s):  
Aditya Kotikalpudi ◽  
Edwin A. Williams ◽  
Peter J. Seiler
Keyword(s):  
Unmanned Aerial Systems ◽  
Aerial Systems ◽  
Redundant Systems

Beach and dune impacts due to Hurricane Florence in Dare County, North Carolina

Shore & Beach ◽  
2019 ◽  
pp. 44-49 ◽  
Author(s):  
Elizabeth Sciaudone ◽  
Liliana Velasquez-Montoya
Keyword(s):  
North Carolina ◽  
Prior Knowledge ◽  
Unmanned Aerial Systems ◽  
State University ◽  
National Wildlife Refuge ◽  
Sediment Samples ◽  
Wildlife Refuge ◽  
Full Report ◽  
Aerial Systems

Less than two weeks after Hurricane Florence made landfall in North Carolina (NC), a team of researchers from NC State University traveled to Dare County to investigate the storm’s effects on beaches and dunes. Using available post-storm imagery and prior knowledge of vulnerabilities in the system, the team identified several locations to visit in the towns of Kitty Hawk, Nags Head, Rodanthe, Buxton, and Hatteras, as well as a number of locations within the Pea Island National Wildlife Refuge (Figure 1). Data collected included topographic profiles, still imagery and video from unmanned aerial systems, sediment samples, and geo-located photography. This Coastal Observations piece presents some of the data and photos collected; the full report is available online (Sciaudone et al. 2019), and data collected will be made available to interested researchers upon request.

Unmanned Aerial Systems (UAS) Mission Planning

2012 ◽  
Author(s):  
R. K. Barnhart
Keyword(s):  
Mission Planning ◽  
Unmanned Aerial Systems ◽  
Aerial Systems

A Comparative Economic Study on the Use of Unmanned Aerial Systems versus Motorcycles to Transport Laboratory Samples in Liberia

2019 ◽  
Author(s):  
Walter Ochieng ◽  
Tun Ye ◽  
Christina M. Scheel ◽  
Aun Lor ◽  
John M. Saindon ◽  
...  
Keyword(s):  
Unmanned Aerial Systems ◽  
Economic Study ◽  
Aerial Systems
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