  Natural disasters such as floods and earthquakes immensely impact the
telecommunication network infrastructure, leading to the malfunctioning and
interruption of wireless services. Consequently, the user devices under the
disaster zone are unable to access the cellular base stations. Wireless
coverage on an unmanned aerial vehicle (UAV) is considered for providing
coverage service to ground user devices in disaster events. This work evaluated
the efficient performance of wireless coverage services of UAVs to provide the
internet to fly things to help recover the communications link in a natural
disaster in multi environments. The results demonstrate the line of sight,
nonline of sight, path loss, and coverage probability for the radio propagation
environment scenario. Therefore, the path loss and coverage probability are
affected by the user devices' elevation angle and distance in the
multi-environment system. The user position's optimum user device distance and
elevation angle are also investigated to improve the coverage probability,
which could be especially useful for the UAV deployment design.
