  Over the past few years, the use of camera-equipped robotic platforms for
data collection and visually monitoring applications has exponentially grown.
Cluttered construction sites with many objects (e.g., bricks, pipes, etc.) on
the ground are challenging environments for a mobile unmanned ground vehicle
(UGV) to navigate. To address this issue, this study presents a mobile UGV
equipped with a stereo camera and a robotic arm that can remove obstacles along
the UGV's path. To achieve this objective, the surrounding environment is
captured by the stereo camera and obstacles are detected. The obstacle's
relative location to the UGV is sent to the robotic arm module through Robot
Operating System (ROS). Then, the robotic arm picks up and removes the
obstacle. The proposed method will greatly enhance the degree of automation and
the frequency of data collection for construction monitoring. The proposed
system is validated through two case studies. The results successfully
demonstrate the detection and removal of obstacles, serving as one of the
enabling factors for developing an autonomous UGV with various construction
operating applications.
