Aerial photo taken on Nov. 17, 2020 shows a smart safety monitoring system for tower cranes at the Jinling Zhonghuan construction project in Nanjing, east China's Jiangsu Province. Constructors of the Jinling Zhonghuan construction project have recently adopted a "smart worksite" application system that integrates computing technologies and the Internet of Things to ensure worksite safety, and to enhance managerial efficiency. The system comprises a digital project platform, a face recognition system, a personal location system, and an environmental monitoring system. (Xinhua/Li Bo)