1. Introduction Nowadays, urban shrinking has become a popular phenomenon of urban development around the world. Over 24.8% of natural cities in the world are considered shrinkage cities [1], with large cities comprising more than 25% [2]. Furthermore, the incidence of shrinkage in small and medium-sized cities is also increasing [3]. From 2000 to 2012, shrinking cities were primarily concentrated in the United States (612), Germany (305), France (224), and the United Kingdom (185) [1].
