It is difficult to use traditional mathematical methods to analyze the relationship between regional macro-spatial structure and micro-individual behavior in reality. The entropy theory provides a new perspective for the cognition of human economic geography space. In particular, thermodynamic entropy is a state function that evaluates the degree of disorder of a spatial system and establishes a cognitive bridge between the macroscopic organization of the system and the number of microscopic states of existence. Information entropy provides an important quantitative method for confirming the attribute information of geographical things and their changing process and spatial organization. From the perspective of the isolated system → complex system → open complex giant system, this article focused on "entropy" in human economic geography from "social physics", gradually discussed the realistic performance of spatial entropy in human economic activities, and then reinterpreted the traditional location theory. Furthermore, this article also discussed the system foundation of spatial entropy theory represented by thermodynamic entropy and information entropy, and its relationship with modern mathematical methods represented by fractals. The purpose was to re-understand the human economic geography space, explore its research paradigm, and grasp its theoretical connotation under the background of the development of system science.

Place is a very important geographical concept. Scholars especially geographers have conducted extensive studies on place. Focusing on the issues and theories of place, this article explores how to couple human geography with Geographic Information System (GIS), with a focus on geographic issues in large-scale urban space and small-scale communities. This is particularly critical for geographic study in China. The main title of this article, "rebuild place", has three meanings. First, it is necessary to break disciplinary boundaries in order to rediscover the new field of "place", especially based on complex and changing theories and practice of place. Second, we should strive to change the "place" in everyday life according to the new theories. Last but not least, rebuilding place in our lives or minds will be achieved by means of coupling theories and practice, thoughts and technology, as well as human geography and GIS. Through using volunteered geographic information (VGI), 3D-VQGIS, and other new GIS methods, the theories and methods on place research can be enriched with big data and other types of data. The combination of human geography and GIS not only has practical significance, but also helps developing new methodologies. Place and scale are complex in reality and in research. For instance, issues in community and in city interact and can be transformed because some micro-scale individual or community events can affect the whole city or urban culture. Interactions at city level or community level are the same to some extent but often different. In the study of China's urbanization and rural-urban relations, it is urgent to introduce, use, and recreate the theories on place with GIS and multi-scale cases. In terms of methodology, combining human geography with GIS will reshape geography. In addition to being an indispensable concept of geography, place is also closely related to everyday life. Dealing with the challenges from evolving globalization and information and communication technologies, place is changing, and the concepts on place or placelessness are also evolving correspondingly. It is significant in geographic research and practice to couple human geography with GIS and explore the way to apply the methodology to explain changing issues in the real world with different temporal, spatial, and social scales, so as to rebuild the place theoretically and practically.