scholarly journals Assessing UAV platform types and optical sensor specifications

2014 ◽  
Vol II-5 ◽  
pp. 17-24 ◽  
Author(s):  
B. Altena ◽  
T. Goedemé
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Chromatic Aberration ◽  
Image Motion ◽  
Lens Distortion ◽  
Mobile Platforms ◽  
Optical Instruments ◽  
Slow Moving ◽  
Processing Software ◽  
Normal Lens

Photogrammetric acquisition with unmanned aerial vehicles (UAV) has grown extensively over the last couple of years. Such mobile platforms and their processing software have matured, resulting in a market which offers off-the-shelf mapping solutions to surveying companies and geospatial enterprises. Different approaches in platform type and optical instruments exist, though its resulting products have similar specifications. To demonstrate differences in acquisitioning practice, a case study over an open mine was flown with two different off-the-shelf UAVs (a fixed-wing and a multi-rotor). The resulting imagery is analyzed to clarify the differences in collection quality. We look at image settings, and stress the fact of photographic experience if manual setting are applied. For mapping production it might be safest to set the camera on automatic. Furthermore, we try to estimate if blur is present due to image motion. A subtle trend seems to be present, for the fast flying platform though its extent is of similar order to the slow moving one. It shows both systems operate at their limits. Finally, the lens distortion is assessed with special attention to chromatic aberration. Here we see that through calibration such aberrations could be present, however detecting this phenomena directly on imagery is not straightforward. For such effects a normal lens is sufficient, though a better lens and collimator does give significant improvement.

Revealing Safety Risks of Unmanned Aerial Vehicles in Construction

2021 ◽  
pp. 036119812110171
Author(s):  
Mostafa Namian ◽  
Mohammad Khalid ◽  
George Wang ◽  
Yelda Turkan
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Construction Projects ◽  
The United States ◽  
Extensive Literature ◽  
Effective Strategies ◽  
Aerial Vehicles ◽  
Safety Risks ◽  
Potential Safety ◽  
Post Hoc

Unmanned aerial vehicles (UAVs) have gained their prevalent recognition in construction because of their exceptional advantages. Despite the increasing use of UAVs in the industry and their remarkable benefits, there are serious potential safety risks associated that have been overlooked. Construction is one of the most hazardous industries in the United States. In addition to the ordinary hazards normally present in dynamic construction workplaces, UAVs can expose workers to a wider range of never-before-seen safety risks that must be recognized and controlled. The industry is not equipped with safety measures to prevent potential accidents, because of scarce research on drone-associated hazards and risks. The aim of this research was to (1) identify the UAV-associated hazards in construction that may expose personnel and property to potential harms, and (2) study the relative impact of each hazard and the associated safety risks. In Phase I, the researchers conducted an extensive literature review and consulted with a construction UAV expert. In Phase II, the researchers obtained data from 54 construction experts validating and evaluating the identified hazards and risks. The results revealed that adopting UAVs can expose construction projects to a variety of hazards that the industry is not familiar with. “Collision with properties,”“collision with humans,” and “distraction” were identified as the top three safety risks. Moreover, the study introduces effective strategies, such as having qualified crew members, proper drone model selection, and drone maintenance, to mitigate the safety risks. Finally, a post-hoc case study was investigated and presented in this article.

scholarly journals FILTERING TECHNIQUES ON ANALYSIS OF ARCHEOLOGY AREAS USING RADARSAT IMAGES: CASE STUDY OF LEMBAH BUJANG, MALAYSIA

2016 ◽  
Vol III-6 ◽  
pp. 9-14
Author(s):  
M. N. Norzailawati ◽  
R. S. Akma ◽  
A. Alias ◽  
M. A. Zuraini
Keyword(s):  
Mathematical Morphology ◽  
Adaptive Filtering ◽  
Speckle Noise ◽  
Archaeological Sites ◽  
Official Gazette ◽  
Radar Imagery ◽  
Multi Temporal ◽  
Processing Software ◽  
Filtering Techniques

Speckle noise present in radar imagery caused by interaction of out –of-phase waves with a target, the objective of this paper is attempt to test filtering techniques consist of Lee, Frost and Gamma Map to identify a potential shrines area in Lembah Bujang using RADARSAT imageries. The multi-temporal images of RADARSAT for years 2003 and 2014 have been used filtering techniques in identifying potential shrines consist of have been used and tested to selected study areas with using processing software of ENVI 4.8 and ArcGIS 10.2. Based on mathematical morphology, the speckles in these images were reduced, once the reduction is achieved, the enhancement of archaeological sites is accomplished. The finding shows that Local Adaptive Filtering on GAMMA Map filter is the best techniques in identifying potential shrines areas at once as guidance to pursuing an area as official gazette historical site in Malaysia context.

New Solutions and Methodologies for Data Acquisition and Management in Small Municipalities

2021 ◽  
pp. 103-123
Author(s):  
Rui Pedro Juliao ◽  
Amilton Amorim ◽  
João Paulo Hespanha ◽  
Guilherme Henrique Barros de Souza ◽  
Ronaldo Celso Messias Correia ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Unmanned Aerial Vehicles ◽  
Spatial Data ◽  
Domain Model ◽  
Territorial Development ◽  
Paulo State ◽  
Land Administration ◽  
Aerial Vehicles ◽  
Data Infrastructures

Promoting and managing sustainable territorial development require adequate tools that enable territorial managers to formulate appropriate choices. Technological solutions have emerged, and the paradigm has shifted from isolated GIS to a more collaborative production and dissemination of geographic data using spatial data infrastructures (SDI). A critical dataset for municipal land administration is cadastre. ISO 19152 standard of the Land Administration Domain Model (LADM) was published in 2012. Also, technology evolution, namely unmanned aerial vehicles (UAV), has changed data acquisition for cadastre. These are three pillars of modern territorial management: openness, co-production, and data sharing (SDI); models (LADM); affordable technology (UAV). This chapter presents how municipalities can develop an SDI project, incorporating LADM guidelines and UAV data acquisition. The case study is based on a group of 32 small municipalities from São Paulo state, in Brazil, known as UNIPONTAL.

Mobile-mediated mothering from a distance: A case study of Somali mothers in Port Elizabeth, South Africa

2020 ◽  
Vol 23 (5) ◽  
pp. 656-673 ◽  
Author(s):  
Celine Meyers ◽  
Pragna Rugunanan
Keyword(s):  
South Africa ◽  
Mobile Technologies ◽  
Structured Interviews ◽  
Mobile Platforms ◽  
Left Behind ◽  
Emotional Bonds ◽  
Distinct Category ◽  
Port Elizabeth ◽  
Educational Pursuits

This article explores the mobile-mediated mothering experiences among migrant Somali mothers living in Port Elizabeth, South Africa. Twenty semi-structured interviews were conducted with Somali mothers to examine how Imo, Viber, Skype and WhatsApp enable them to fulfil important maternal responsibilities toward their left-behind children in Somalia. The findings reveal that three types of maternal tensions occur due to their migration: guilt and concern, family strains, and judgement in Somali communities. Efforts to overcome these tensions include the adoption of mobile technologies to continue to mother from a distance. Migrant Somali mothers in this study mediate mothering using mobile platforms by: (a) transferring remittances to their children’s caretakers, (b) sustaining emotional bonds, (c) teaching religious beliefs, and (d) encouraging educational pursuits. By focusing on mothers as a distinct category of women, this study contributes to the theoretical call for more scholarship on matricentric feminism.

Mobile Virtual Heritage Exploration with Heritage Hunt with a Case Study of George Town, Penang, Malaysia

2011 ◽  
Vol 2 (4) ◽  
pp. 74-86
Author(s):  
Kiam Lam Tan ◽  
Chen Kim Lim ◽  
Abdullah Zawawi bin Haji Talib
Keyword(s):  
Virtual Reality ◽  
Computer Games ◽  
Mobile Platforms ◽  
Mobile Phone Technology ◽  
Heritage Sites ◽  
Virtual Heritage ◽  
Desktop Computers ◽  
Game Console ◽  
George Town

Computer games with fully intensive graphics are very common in desktop computers or game console, but the development of mobile games with intensive graphics are fairly new. With the advancement in mobile phone technology, it is possible to create a mobile game incorporates integrate the virtual reality techniques. In this paper, the authors present a virtual heritage application called M-Heritage Hunt that integrates virtual reality and game for mobile platforms. M-Heritage Hunt provides panoramic views of the heritage sites and a game background that is customized for the core of heritage zone of George Town, Penang in Malaysia. M-Heritage Hunt was evaluated and examined by letting the respondents to play the game in its proposed setting.

scholarly journals Collecting Built Environment Information Using UAVs: Time and Applicability in Building Inspection Activities

2020 ◽  
Vol 12 (11) ◽  
pp. 4731
Author(s):  
Rachele Grosso ◽  
Umberto Mecca ◽  
Giuseppe Moglia ◽  
Francesco Prizzon ◽  
Manuela Rebaudengo
Keyword(s):  
Built Environment ◽  
Unmanned Aerial Vehicles ◽  
Industrial Sector ◽  
Construction Sector ◽  
Costs And Benefits ◽  
Aerial Vehicles ◽  
Ex Post ◽  
Ex Ante ◽  
Way Of Thinking

The Italian way of thinking about maintenance is too often one-sided. Indeed, it is considered not so much as a useful practice to prevent the occurrence of a fault (ex ante), but as an intervention to solve it (ex post). Analyzing the legislation relating to the construction sector, it can be seen that it does not clearly define the responsibilities, timescales and methods in which maintenance interventions must be planned and carried out. For this reason, this practice is still very weak compared, for example, to the industrial sector, where it is an established practice. Currently, the complexity of reading the maintenance plans drawn up by designers and the considerable costs associated with maintenance operations discourage owners and managers from even carrying out preliminary inspection operations. This research aims to stimulate these stakeholders to carry out inspection operations regularly, highlighting their costs and benefits. In particular, working on a case study in Piedmont, the costs of visual inspections carried out in the traditional way are compared with those that would be incurred if unmanned aerial vehicles (UAVs) were used. Finally, the collateral benefits of inspections carried out with UAVs are highlighted.

Design of Hospital Delivery Networks Using Unmanned Aerial Vehicles

2020 ◽  
Vol 2674 (5) ◽  
pp. 405-418 ◽  
Author(s):  
Alejandra Otero Arenzana ◽  
Jose Javier Escribano Macias ◽  
Panagiotis Angeloudis
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Optimal Number ◽  
Baseline Scenario ◽  
Urban Hospital ◽  
Aerial Vehicles ◽  
Strategic Model ◽  
Delivery Services ◽  
Location Algorithm ◽  
Delivery Networks

Unmanned aerial vehicles (UAVs) are being increasingly implemented in a range of applications. Their low payload capacity and ability to overcome congested road networks enables them to provide fast delivery services for urgent high-value low-volume cargo. This work investigates the economic viability of integrating UAVs into urban hospital supply chains. In doing so, a strategic model that determines the optimal configuration of supporting infrastructure for urgent UAV delivery between hospitals is proposed. The model incorporates a tailored facility location algorithm that selects an optimal number of hubs given a set of candidates and determines the number of UAVs required to fulfill total demand. The objective is to minimize the total cost of implementation, computed as the sum of generalized, battery, vehicle, and hub establishment costs. The model is applied to a case study based on the establishment of a UAV delivery network for deliveries between National Health Service (NHS) hospitals in London. A baseline scenario is also developed using current NHS vehicles for delivery. Results demonstrate that UAV-based delivery provides significant reductions in operational costs compared with the baseline. Furthermore, the analysis indicates the location of hubs is more significant to the solution optimality than any increase in range or payload.

Visual Inspection of Historical Buildings Using Unmanned Aerial Vehicles (UAV): A Case Study of Sultan Abu Bakar Mosque, Johor

2016 ◽  
Vol 22 (9) ◽  
pp. 2160-2163 ◽  
Author(s):  
Masiri Kaamin ◽  
Misbahul Muneer Abd Rahman ◽  
Norhayati Ngadiman ◽  
Aslila Abd Kadir ◽  
Ahmad Hakimi Mat Nor ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Visual Inspection ◽  
Historical Buildings ◽  
Aerial Vehicles
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