Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unmanned Aerial Vehicles: A Survey on Civil Applications and Key
  Research Challenges   The use of unmanned aerial vehicles (UAVs) is growing rapidly across many
civil application domains including real-time monitoring, providing wireless
coverage, remote sensing, search and rescue, delivery of goods, security and
surveillance, precision agriculture, and civil infrastructure inspection. Smart
UAVs are the next big revolution in UAV technology promising to provide new
opportunities in different applications, especially in civil infrastructure in
terms of reduced risks and lower cost. Civil infrastructure is expected to
dominate the more that $45 Billion market value of UAV usage. In this survey,
we present UAV civil applications and their challenges. We also discuss current
research trends and provide future insights for potential UAV uses.
Furthermore, we present the key challenges for UAV civil applications,
including: charging challenges, collision avoidance and swarming challenges,
and networking and security related challenges. Based on our review of the
recent literature, we discuss open research challenges and draw high-level
insights on how these challenges might be approached.

20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol