## 1 Introduction  
Social development, economic growth, urban expansion and increasing rates of urbanization are making rapid changes in Chinese cities. At the end of 2021, the urbanization rate of permanent residents in China was 64.72%. According to the estimation of the United Nations, the urbanization rate of developed countries in the world will reach 86% in 2050, and that of China will reach 71.2% in 2050 [1]. In this process of change, the renewal and redevelopment of brownfield land have become a new growth point in the development of urban public spaces [2]. In the redevelopment projects using brownfield sites, due to low public participation, the top-down government and development management departments often collide with the needs of the public, and conflicts occur from time to time, which lead to the redevelopment of brownfield land becoming a hot issue at present [3]. Although more and more attention has been paid to public participation in redevelopment or protection projects relating to brownfield sites, due to the relatively weak position of the public and the lack of consistent views and language with other groups, there are many obstacles to the expression of opinions, such as the way of expression is not clear and cannot be quantified, which makes it difficult to achieve effective participation [4]. Establishing a platform for public opinion expression from the technical level which promotes mutual understanding among different interest groups is a problem faced by public participation. Geographic Information System (GIS) has powerful data storage, analysis and display functions. It is a powerful tool assisting spatial planning and management, and also a tool to support public participation [5]. However, for a long time, GIS mainly relies upon objective observation data, such as remote sensing, to study the characteristics and changes in physical landscapes such as environment and ecology (such as land use and cover changes), and it is difficult to bring the phenomena related to people's subjective activities (such as values, attitudes, preferences and experiences) into the analysis category [6]. In fact, in the development or protection projects involving public interests, public attitude is often the direct factor that causes social contradictions and conflicts, and it is also the key to the success or failure of the project [4; 7]. Incorporating the subjective activities of the public into the analysis of GIS can greatly enhance its ability to explain complex social phenomena [8]. The expression and analysis methods of public subject activities based on GIS are of great significance to promote public participation and regional harmonious development [9]. Landscape analysis provides a theoretical method for understanding the subjective attitude of the public [10], while GIS, especially the Public Participation GIS (PPGIS) platform, provides a tool for the quantitative expression of public participation activities and the establishment of direct contact with space [6]. There is very little research on community and public participation in the process of brownfield redevelopment by analysis and decision support combined with the GIS system [11]. The research on public participation relating to brownfield redevelopment is mainly concentrated in the fields related to brownfield governance, development and PPGIS, among which the fields with higher correlation are those related to the environment, such as environmental protection, environmental management, etc. [12]. Another relatively concentrated focus is in the field of urban planning, and another related field is the related research on decision support systems combining GIS and public participation [6]. This paper aims to explore the quantitative analysis of brownfield redevelopment stakeholders' attitudes based on landscape value theory and how it can play a role in supporting decision-making in the brownfield redevelopment process.