US Patent 11216671 Environment monitoring system

An environment monitoring system includes N sensors, a server and a monitoring device, where N≥3. The sensors respectively generate multiple pieces of sense data related to a monitoring area. The server determines whether at least three of the pieces of sense data are abnormal, and generates position data based on the at least three pieces of abnormal sense data when the determination is affirmative. The monitoring device includes a body that is movable in the monitoring area, an image capturing module and a control module. The control module controls the body to move to a position corresponding to the position data, and the image capturing module captures an image at said position.