The goal of this workshop is to influence the smart city practice in the highly developed cities in Asia and around the world. After a first successful edition in Singapore in 2019, we are now taking the event to Hong Kong. The main aim of the workshop is to demonstrate and discuss lessons learned and progress in geophysical techniques in smart city applications and methods, with an emphasis on interdisciplinary efforts with civil engineering and digital technologies. Hardware sensor development, remote sensing application, data analytics, and social and environmental impacts of technologies will be covered.