Systematic Review on Civilian Drones in Safety and Security Applications

: The employment of unmanned aerial vehicles, also known as UAVs, is expanding rapidly across various civil application areas. Some of these domains include real-time tracking, the provision of wireless coverage, sensing, searches and rescue, the delivery of goods, safety and surveillance, security, and safety checks of engineering structures. Smart UAVs represent the next technology revolution in UAV technology. They promise to provide new possibilities in various applications, notably lower risk and costs for civil infrastructure. The military has traditionally used unmanned aerial vehicles (UAVs) in countries such as the United Kingdom or the United States to partake in military and dangerous operations. The application and usage of these UAVs have become more commercial. Civilians can easily buy UAVs, commonly known as drones, from online platforms or shops. The main aim of this study is to review selected publications presenting previous efforts on using Civilian Drones in Safety applications. The study was accomplished using a systematic review research approach reviewing 45 publications. Drones have become more common, and it is crucial to understand how they work, especially since they entered the civilian domain. The research shows how civilian drones have been used in numerous safety applications, such as security cameras videotaping a house to ensure its safety.


Introduction
Drones are unpiloted and unmanned aircraft.They are sometimes known as unmanned aerial vehicles or UAVs for short [1].They operate without a human pilot on board.They have different levels of autonomy.A drone can rely on its own systems that houses Light Detection and Ranging (LIDAR) detectors, sensitive sensors, all of which are used to calculate its movements and its surroundings, ensuring it does not crash while on its flight plan.This is known as autopilot or advanced autonomy [2].It can also rely on a human controlling its movements, known as a remotely piloted autonomy.Drones come in different sizes and shapes depending on what task they are completing.They have varying travelling capabilities in the high and distance that they can go.Very close-range drones can travel up to three miles.These are commonly used by hobbyists.Meanwhile close-range drones can have a range up to 30 miles [3].The longest-range drones can travel up to or beyond 400 miles and 3000 feet in the sky.
There are many purposes for them, ranging from collecting data for scientists to dropping groceries off or even finding people trapped under debris or avalanches.These drones are commonly used for dangerous tasks.They were originally created for aerospace industries as well as the military to aid in their tasks [4].The drones were commonly used for safety applications such as ensuring that an area was safe for troops to move in to, or to see if someone was buried under rubble before rescue teams went in, and in some cases used in place of soldiers where drones are fitted with weapons such as bombs [4].Over the years, drone technology has become mainstream and has slowly entered into civilian Drones 2023, 7, 210 2 of 33 hands due to their efficiency and the effective safety they can bring.Civilian drones can be used to carry groceries to the doorstep or to photograph any view a person wants from different angles or heights [5].
Drones can supplement human guards by conducting site inspections, obtaining aerial footage of resources, securing perimeters, and attempting to prevent break-ins [6].They can also be used to patrol work sites.They can provide real-time data streaming around the clock because they are integrated with AI technologies [7].On the other hand, the monitoring drone foreshadows the development of new applications for "tomorrow's security" due to the extraordinary observation and movement possibilities it offers, which are continually being improved by the most recent technological advances.Because of its wide range of applications and significant operational value, it is an invaluable air asset in complex or high-stakes circumstances, regardless of whether the situation involves public or private security [8].Therefore, the success of a drone safety system is based, above and beyond its technical features, on its operations and maintenance functionalities, the application intelligence created, and its ability to be embraced by professionals [9].In the performance of their duties, security officers can benefit significantly from using professional drones because they enable them to reduce potential dangers, foresee potential hazards, and respond to emergencies at an earlier stage.The expert drone is, therefore, exceptionally suitable for use in safety and security; it also meets the requirements of public safety and security, such as monitoring mega events or monitoring outdoor venues.Altawy et al. [10] also conducted a study on safety and security in sporting events.As a result, it is possible to incorporate it into the services offered by private security companies, where it would bolster the overarching risk management plan and work closely with team members of security officers.Therefore, the benefits are an increase in quality, a decrease in emissions, and a safety improvement.As a result of the substantial benefits that unmanned surface vehicles (USVs) provide in the areas of efficiency, costs, ecologic imprint, logistical support, and safety, this field is undergoing increased utilization and development.Altawy et al. [10] found that hobbyists using drones recreationally currently account for the vast majority of civilian drone usage.
This paper seeks to provide a comprehensive systematic review extracted from 45 published articles within the year of 2011 to 2021; in order to highlight the potential for using drones for safety and security purposes.In addition, it will enable the identification of different areas that could benefit from drones to achieve better security and safety outcomes.Moreover, the paper will be very beneficial for researchers, developers, and other stakeholders to have one reference that includes a summary of a wide range of references to refer to achieve future objectives, rather than spending more time on searching and reviewing.
The paper has been structured into five sections.Following this introduction, the research methodology is presented, followed by the findings from the systematic review, the findings from the meta-analysis, discussion, and conclusion.The references follow the main body.

Research Methodology 2.1. Research Desing (Qualitative Research Design)
The study used qualitative research design in order to do a systematic literature review.It's possible to conduct a systematic review using either qualitative or quantitative methods or a hybrid of the two [11].The research topic and the breadth of the investigation both play a role in determining the methodology that will be utilised [12].The term "mixed method" refers to an approach to research that combines qualitative and quantitative approaches within the same investigation.One way to compile research on a subject is through a systematic qualitative review, which involves searching in an organized manner for research evidence from primary qualitative studies and then bringing those findings together [13].The question of whether or not it is necessary for the search to be comprehensive is currently being discussed.In a qualitative literature review, the data Drones 2023, 7, 210 3 of 33 from the studies are analysed using either a qualitative approach, a thematic approach, or a narrative approach.However, the study's objectives lead us to use qualitative systematic literature review.Using a qualitative research approach is to evaluate the factors and elements that implement the applications of drones in safety and security purposes.

Systematic Literature Review
As illustrated in Figure 1 for this study, a systematic review method has been used.A systematic review is a style of analysis that researchers carry out to find all different forms of evidence on a particular question [14].This form of review is seen as a reliable source of evidence due to it critically reviewing and giving a summary of different research papers that can help with research.The papers and publications reviewed are known as secondary research and data.This data and research are done by someone else.These reviews are needed to establish a better understanding of the research field and to generate new data.This literature review is different from a systematic review.Unlike the literature review, which is also called narrative review, which represents all available information on a given subject or topic, whereas a systematic review attempts to find all the materials and resources available that answer a specific question the researcher has [15].Therefore, a systematic literature review is used to identify the factors that lead companies and organizations to implement drone usage in safety and security.
research papers that can help with research.The papers and publications known as secondary research and data.This data and research are done by These reviews are needed to establish a better understanding of the resear generate new data.This literature review is different from a systematic revi literature review, which is also called narrative review, which represent information on a given subject or topic, whereas a systematic review attem the materials and resources available that answer a specific question the [15].Therefore, a systematic literature review is used to identify the fac companies and organizations to implement drone usage in safety and secu For those who are interested in UAV (drone) technology, the following were made by researchers who used cyber security and safety to advance t present investigation is supplemented by this systemic literature review (SLR these contributions.While searching for UAV papers about this particular f thirty primary studies.In order to provide an up-to-date perspective of perform an analysis of the data that was collected by the different studies a findings.Our goal in conducting this review is to acquire a more in-depth un the topic.This review aims to investigate the many different approaches tha to improve the security of a wide variety of cybertechnologies.Throug guidelines and making representations, we hope to stimulate additional r area.The following section will also discuss the numerous facets of UAV sec  For those who are interested in UAV (drone) technology, the following contributions were made by researchers who used cyber security and safety to advance their work.The present investigation is supplemented by this systemic literature review (SLR), which offers these contributions.While searching for UAV papers about this particular field, we found thirty primary studies.In order to provide an up-to-date perspective of the UAV, we perform an analysis of the data that was collected by the different studies and present our findings.Our goal in conducting this review is to acquire a more in-depth understanding of the topic.This review aims to investigate the many different approaches that can be taken to improve the security of a wide variety of cybertechnologies.Through establishing guidelines and making representations, we hope to stimulate additional research in this area.The following section will also discuss the numerous facets of UAV security in depth.

Inclusion and Exclusion Criteria
This article aims to conduct a literature review on safety and security using unmanned aerial vehicles (UAVs), specifically focusing on cybersecurity problems and potential solutions applicable to this context.The study selection criteria were applied to select the papers most pertinent for the review.After compiling the results of the search, the information was run through Google scholar to locate the most relevant papers.The criteria used to decide which papers should be included and which should be excluded from the primary studies are outlined.The search string pertaining to UAVs in safety and security was utilised to search through the hundreds of research papers available.Following the removal of duplicates and studies that were not relevant to the topic at hand, there were 45 research papers left to evaluate using the inclusion and exclusion criteria.Following the application of the criteria, there were a total of 60 papers retained.The discovery of two and three additional papers through snowballing in different directions brought the total number of papers included in this SLR up to 45.

Data Extraction
Since we now have our complete set of research papers, the next step is to plot out how we will extract information from them.Considering that safety and security are connected to the subject that we are discussing, the first thing that we look for safety and security through UAVs.We are looking for those papers that contain extensive information regarding the safety of UAVs, and in order to evaluate it, we will use the information on UAVs that was provided by other papers.In order to conduct additional research, we created two categories and then divided the papers into those categories.These classifications are as follows: The UAV: Its Functions and Use-Cases Threats, attacks, and potential countermeasures are discussed with regard to safety and security.

Selection Criteria of Sampling
This study focused on civilian drones in safety and security application as the criteria for inclusion in this review, hence, 60 articles have been reviewed and only 45 articles included (Figure 1).This allows us to see all possible research that show similar results or similar hypotheses or understanding on how civilian drones can be utilized in safety and security applications.Another selection criterion was to only cover publications within the period of 10 years from 2011 to 2021, to see if past observations and findings align with present ones.Each review will note down the aim of the study, the method used within the study, their findings as well as recommendation for future research and conclusions.That have been useful to establish and refine classification diagram to represent the four candidate industries for drones' application in safety and security purposes along with three key areas within each industry.

Meta-Analysis
Meta-analysis is an important component of this systematic review because it allows for the analysis of previous studies' summarized findings in Table 1, to identify trends and features within the studies conducted.In other words, it involves analyzing the analyses of other studies to gain a deeper understanding of the data [16].Therefore, meta-analysis has been used in this study to establish when and where studies were focused, a high of systems used basic GPS and camera within the application, in addition to the use of advanced sensors and software.

Findings from SLR
As highlighted in the methodology section for the systematic review findings, in Table 1, essential items were included to enable the achievement of the goal of this study.It starts with identifying the drone application sector, industry of use, study title and authors, year of publication, study goal, type of drone used, type of sensors used, type of software used, and finally, the key outcomes from the study were listed following each.
From Table 1, the key findings from SLR(a) on drones' applications for security and safety within the engineering sector can be summarized as follows: • Drone technology has a range of applications in different industries, including construction, mining, and urban development.In construction, drones can make managers' safety inspections easier by providing real-time footage and pictures, and by spotting hazards much quicker than human inspectors [17].Drones can also improve worker safety by performing tasks that are hard for them to do, such as mapping areas and using thermal imagery to ensure site stability, and they can save time and money for those who use them [18].

•
However, more work and research are required to use drones on a daily basis and outside of a controlled environment, and the hazards associated with drones have not been thoroughly researched [19,23].Nevertheless, participants in studies found the benefits of drone usage to be positive and preferred the clear view it provided [22,28].

•
In the mining industry, drones can help with the challenges faced by workers [26], but some types of drones and sensors face challenges, which suggests more research on alternative drone usage is needed [27].In construction, the use of the 4D (3D + Schedule) BIM-based model system can mitigate accidents and fatalities during construction by following regulations and improving safety for all stakeholders [24].

•
The proposed system of augmented reality (AR) and drones can provide safety for difficult and dangerous access for humans and modify and perform different operations for the models created by the system [25].

•
In urban development, smart cities are turning to technology, including drones, to improve their quality of life, accommodate new residents, and offer benefits such as package delivery, policing, traffic monitoring, and ambulance drones [30].

•
Overall, drone technology has a variety of applications in engineering sector, and while more research is needed to address the hazards and improve daily usage, their benefits cannot be overlooked.
From Table 1, key findings from SLR(b) for drones' applications for security and safety within the environment and urban sector can be summarized as follows:

•
Drones have proven to be useful in a variety of applications, including environmental monitoring and gas detection.In one study, drones equipped with gas monitors accurately determined the amount of gas released from known sites [31].However, it is important to consider the potential risks associated with drone usage.While drones can aid in management, it is necessary to determine if their benefits outweigh the risks [32].

•
One advantage of using drones for environmental monitoring is the ability to install sensors and software specific to certain tasks, such as monitoring ground movement.
This not only provides a more comprehensive view but also increases human safety and reduces the need for physically demanding work [33].

•
Drone control systems offer users the ability to manually fly the drone or set waypoints that conform to a desired trajectory.Google Maps can be used to ensure the drone stays on course and does not pose a danger to those on the ground [34].

•
While drones have shown promising results in various applications, more research is needed, particularly in active environments such as roads outside of university campuses.Researchers have also identified the potential for drones to identify conflicts [35].

•
As the popularity of drones continues to increase, it is necessary to study their longterm impact on infrastructure and transportation.Additionally, achieving unmanned aircraft traffic management within the next five years could enhance economic growth while maintaining privacy for those not involved in drone operations [36].

•
One proposed application for drones is a swarm of autonomous drones that can assist first-responders from multiple organizations.Researchers plan to study path selection mechanisms to reduce end-to-end delay using a wireless mesh network [38].
From Table 1, key findings from the systematic literature review on drones' applications for security and safety within the public sector can be summarized as follows: • With the rise of police drones, the radical asymmetry between the techniques of the hunters and the hunted becomes more apparent, bringing this relationship of dominance even more to the forefront, in a similar but even more dramatic fashion than SWAT teams and armored vehicles.This unmanning of the police manhunt is but the newest symbol of the pacification project that the poor and oppressed have been living and dying under.Pacification, however, always assumes populations that resist and is, therefore, never a completed project [39].

•
For homeland security missions, UAV requirements and preliminaries are largely different from those for military operations.UAVs transmit telemetry and payload data using frequencies that are not owned by homeland security agencies.As fire and police departments have limited funding, cost is also a major concern for them.On the other hand, the requirements for payload weight, operating conditions, and ranges are relatively lax.Work on getting past these issues is needed [40].

•
Firefighters support the use of drones due to their benefits, and future work should consider using drones in a real fire situation to see if they are still functional or beneficial [41].UAVs will be beneficial for the network, but more research on how to solve issues is needed [42].One study notes how useful or strong the communication capability of the drone is.The study proposes that the D2D drone's communication be extended to the wireless coverage of the public safety network [43].Another study found that the drone was useful in tracking targeted people and worked well in the field.However, some issues came up that would need to be studied further to ensure they do not happen again in the field [44].

•
Drones are shown to be a valuable tool for detecting sharks in one study, meeting increasing demands for better protection while remaining minimally destructive to marine life.Drones are useful in notifying staff and lifeguards when a shark has been spotted, making evacuation quicker [45].It is important to understand people's perception of this technology.Many of the people using this technology were pilots, army members, and first responders such as firefighters [47].

•
Drones provide users with a bird's eye view that can be used almost anywhere and at any time.In recent years, however, criminals and cybercriminals have begun to use drones maliciously [48].Using surveillance drones is one way to detect amateur drones and is cost effective.More research on how to maximize the time and energy of the drone is needed [49].

•
In sports, typically 80% of injuries are sprains, cramps, and abrasions.Drones equipped with Elide-brand fire extinguishable balls are used to stop fires during such accidents as soon as possible.Organizers of sports events can provide athletes with medical support with the aid of the solution presented here as quickly as possible.This is due to how effective drone usage is in ensuring the safety of athletes should an emergency occur [50].

•
While humans could be replaced by robots and computers in jobs requiring physical exertion in hazardous conditions, automation can negatively impact the job market and can change people's behavior, such as how they spend their free time.Technology during sports is viewed negatively when it engages in unacceptable, unjudged behavior defined as abusing modern technological solutions, commonly known as "technology doping."A German competitor's bicycle was found to have an electric engine in its frame in Heusden-Zolder in 2016 [51].
From Table 1, key findings from SLR(d), for drones' applications for security and safety within healthcare sector can be summarised as followed:

•
The United States faces a major challenge with drone companies.FAA regulations are causing limitations on drone operators, whether large or small.It is not possible to access some airspace.If cities and states released their aerial easements, that would be helpful.Medical innovation is encouraged by drones, which enhance supply logistical efficiency.Switzerland, Rwanda, and China all have drone delivery networks in place.
In many hard-to-reach areas of the United States, there are several companies and organizations that can provide medical care and mail.Due to their top speed of 60 to 100 mph, drones can shorten supply chains since they don't need to navigate through traffic.Since drones deliver goods directly to rural homes instead of distribution centres, they could also in-crease social distance.By downloading an app, you can have the grocery store employee's load up your items and send them back to you [52].

•
Drones are useful in aid of the healthcare sector.However, as this may be the first-time drones have been used during a pandemic, more research is needed [53].Drone use will reduce human contact.This will reduce rates of infection and those who die from COVID 19.Nurses and doctors as well as patients will be safer [54].Despite regulation issues, drones are a useful technology to use [55].

•
By utilizing surgical robots to maintain high quality care, the healthcare system in Europe will operate at a much higher performance and cost-effectiveness.The operator should be close to the remote site in order to reduce performance degradation caused by large latencies.5G technology would reduce latency issues, making mobile robotic surgery more accessible.This paper also presents a data sharing mechanism and personalized data analysis model for 5G-Smart Diabetes.A cyber-physical healthcare system allows the recognition of a patient's condition at the first step of a fully digitized remote healthcare system.ML is used in a multi-layer framework that consists of many low-cost lightweight devices.5G technology makes it possible to establish virtual hospitals via a communication channel, offering a variety of services [56].

•
Researchers found that the drone transportation system tested in this study had no negative effects on the growth times of sample types or microbes.All microbes studied showed similar recovery times, colony counts, and morphologies [57].These findings contribute to the development of future research directions for humanitarian drones, their performance outcomes, and their respective barriers.In this study, we analyze potential humanitarian applications of drones, and we present a comprehensive agenda to structure and guide future research on this topic [58].

•
Drone usage in disaster areas is beneficial as it keeps people safe.In conclusion, they provide an example of how UAVs can be used to aid rescue teams in detecting and observing.This approach is nonetheless promising, both technically and operationally, in enhancing disaster management efforts.Search and rescue can benefit from drone use in a variety of ways.They are more likely to become a burden if they cannot function autonomously and independently [59].Drones are capable of tracking people after implementing software and training them to move left or right to follow the person.Their durability makes them effective against falling debris or shaking of the ground.They are not perfect as their durability does need more work, as well as there being a need to implement programs where the drone, once it detects trouble, immediately moves out of the way to stay safe and keep tracking people.Overall, the use of drones in a disaster area is beneficial [60].

•
Despite its limited payload capacity, wind speed, and flight endurance, small, remotely piloted aircraft can be used as effective tool carriers.A major incident scene can be assessed, and information exchanged using remote sensing using RPA technology already in use in pre-hospital settings.Future work on real-time video footage from an incident is important as it will allow decision-makers and situational analysts to assess [61].• Despite its limited payload capacity, wind speed, and flight endurance, small, remotely piloted aircraft can be used as effective tool carriers.A major incident scene can be assessed, and information exchanged using remote sensing using RPA technology already in use in pre-hospital settings.Future work on real-time video footage from an incident is important as it will allow decision-makers and situational analysts to assess [61].The pie charts in Figure 4, generated from Appendix A (Table A1).present the proportion of papers or studies that used drones with Basic Sensor GPS/Camera, Advance Sensor, and Advance Software in their research.As the diagrams show 71% of the involved studies in this research used the Basic Sensor as GPS and 64% of them used the Basic Sensor as a Camera.51% of the involved studies used Advanced Sensors and 56% used Advance Software.

Discussion
The outcomes of this systematic review clearly revealed that drones have great potential within the safety and security applications in different industries, as appears from the great increase in number of publications within the last 5 years of this study.The pie charts in Figure 4, generated from Appendix A (Table A1).present the proportion of papers or studies that used drones with Basic Sensor GPS/Camera, Advance Sensor, and Advance Software in their research.As the diagrams show 71% of the involved studies in this research used the Basic Sensor as GPS and 64% of them used the Basic Sensor as a Camera.51% of the involved studies used Advanced Sensors and 56% used Advance Software.The pie charts in Figure 4, generated from Appendix A (Table A1).present the proportion of papers or studies that used drones with Basic Sensor GPS/Camera, Advance Sensor, and Advance Software in their research.As the diagrams show 71% of the involved studies in this research used the Basic Sensor as GPS and 64% of them used the Basic Sensor as a Camera.51% of the involved studies used Advanced Sensors and 56% used Advance Software.

Discussion
The outcomes of this systematic review clearly revealed that drones have great potential within the safety and security applications in different industries, as appears from the great increase in number of publications within the last 5 years of this study.

Discussion
The outcomes of this systematic review clearly revealed that drones have great potential within the safety and security applications in different industries, as appears from the great increase in number of publications within the last 5 years of this study.Moreover, the analysis revealed that the majority of applications have used the global positioning system as the means of location sensor and camera in their system.Meanwhile, over 50% of the applications have extended to include advanced sensors and software to enable advanced applications.Furthermore, the systematic analysis revealed that there are two key areas which still have a limited number of publications or research papers, which are smart cities and mega sporting events.Figure 5 shows the comprehensive applications of drones in safety and security matters in Healthcare, Engineering, Public and Environment, and Urban units.In the field of drone technology, it is important to remember that drone technology is still evolving.Despite the endless opportunities they offer, challenges are still to be met to ensure the safe, secure, and effective deployment of drone applications in real life [62].This includes various important aspects, such as privacy and security concerns [63,64] and energy restrictions of the battery on board [65].Moreover.to ensure the safe and effective integration of unmanned aerial vehicles (UAVs) into global airspace, it is necessary to establish civilian UAV deployment frameworks in accordance with the global efforts endorsed by the International Civil Aviation Organization (ICAO) [66].
Moreover, the analysis revealed that the majority of applications have used the glo positioning system as the means of location sensor and camera in their syste Meanwhile, over 50% of the applications have extended to include advanced sensors a software to enable advanced applications.Furthermore, the systematic analysis revea that there are two key areas which still have a limited number of publications or resea papers, which are smart cities and mega sporting events.Figure 5 shows comprehensive applications of drones in safety and security matters in Healthca Engineering, Public and Environment, and Urban units.In the field of drone technolo it is important to remember that drone technology is still evolving.Despite the endl opportunities they offer, challenges are still to be met to ensure the safe, secure, a effective deployment of drone applications in real life [62].This includes vario important aspects, such as privacy and security concerns [63,64] and energy restrictio of the battery on board [65].Moreover.to ensure the safe and effective integration unmanned aerial vehicles (UAVs) into global airspace, it is necessary to establish civil UAV deployment frameworks in accordance with the global efforts endorsed by International Civil Aviation Organization (ICAO) [66].

Conclusions
The main goal of this study was to conduct a systematic review of published pap from 2011 to 2021 in order to identify possible applications for drones in the areas of saf and security.It was clear from the systematic review that there is great potential for dro applications starting to emerge, mainly during the past five years, in these two doma across a wide range of sectors and industries.The study also revealed that drones need be equipped with specific sensors and software to achieve such applications.Hen further research is required to focus is needed to establish standards for safety a security a drones-based applications.The outcomes from this paper will be very usefu different ways, such as supporting further research and enabling stakeholders to use o paper as an index for 45 documents, allowing them to explore those applications furth The search was limited within the scope of the pre-identified systematic review criteria would be useful for future research to expand and identify key requirements for dro applications in safety and security in each sector.

Conclusions
The main goal of this study was to conduct a systematic review of published papers from 2011 to 2021 in order to identify possible applications for drones in the areas of safety and security.It was clear from the systematic review that there is great potential for drone applications starting to emerge, mainly during the past five years, in these two domains across a wide range of sectors and industries.The study also revealed that drones need to be equipped with specific sensors and software to achieve such applications.Hence, further research is required to focus is needed to establish standards for safety and security a drones-based applications.The outcomes from this paper will be very useful in different ways, such as supporting further research and enabling stakeholders to use one paper as an index for 45 documents, allowing them to explore those applications further.The search was limited within the scope of the pre-identified systematic review criteria.It would be useful for future research to expand and identify key requirements for drone applications in safety and security in each sector.

Figure 2
Figure 2 demonstrates the numbers of papers that have been taken place in the safety applications of drones to each theme-Engineering, Environment & Urban, Public, and Healthcare-during the last 10 years from 2011 to 2021.We considered the safety applications of drones of each theme-Engineering, Environment & Urban, Public, and Healthcare-during the last 10 years from 2011 to 2021.As the diagram shows, most of the selected papers to this research have been published just from the last 5 years of this study, while in the first 5 years are just a few papers from different themes.

Figure 2
Figure 2 demonstrates the numbers of papers that have been taken place in the safety applications of drones to each theme-Engineering, Environment & Urban, Public, and Healthcare-during the last 10 years from 2011 to 2021.We considered the safety applications of drones of each theme-Engineering, Environment & Urban, Public, and Healthcare-during the last 10 years from 2011 to 2021.As the diagram shows, most of the selected papers to this research have been published just from the last 5 years of this study, while in the first 5 years are just a few papers from different themes.

Figure 2 .
Figure 2. Number of Papers to Each Theme from 2011 to 2021.

Figure 3
Figure 3 illustrates the percentage of each theme that has taken place in the safety applications of drones.The table on the right-hand side is an illustration showing the percentage of each industry in each theme, where the colours refer to each theme.The Engineering and Public themes have more focus on this research in comparison with the Environment & Urban and Healthcare themes.

Figure 2 .
Figure 2. Number of Papers to Each Theme from 2011 to 2021.

Figure 3
Figure 3 illustrates the percentage of each theme that has taken place in the safety applications of drones.The table on the right-hand side is an illustration showing the percentage of each industry in each theme, where the colours refer to each theme.The Engineering and Public themes have more focus on this research in comparison with the Environment & Urban and Healthcare themes.

Figure 3 .
Figure 3. Percentage of Each Drones Application Theme.

Figure 4 .
Figure 4. Percentage of Papers that are using Advanced/Basic Sensors and Software.

Figure 3 .
Figure 3. Percentage of Each Drones Application Theme.

Figure 4 .
Figure 4. Percentage of Papers that are using Advanced/Basic Sensors and Software.

Figure 4 .
Figure 4. Percentage of Papers that are using Advanced/Basic Sensors and Software.

Figure 5 .
Figure 5. Drones Themes in Safety and Security Applications.

Figure 5 .
Figure 5. Drones Themes in Safety and Security Applications.