3. Evaluation index systems of blue-green spaces
In the process of rapid urban development, some problems such as the destruction of ecological balance inevitably existed due to imbalanced planning, thus eventually leading to urban sub-health of a city. Therefore, the “symptoms” and “causes” of urban environmental problems are often explored by constructing an evaluation index system, in order to obtain suitable countermeasures for urban restoration and subsequent ecological restoration. Therefore, the construction of cities has experienced the following transformation stages: the initial stage focusing on water bodies and green spaces for the purpose of providing the material basis for human beings, the second stage of providing the ecological functions of climate regulation, and the third stage focusing on the cultural and support benefits. In more urban planning, economic construction has shifted to people-centered construction and the happiness and satisfaction of urban residents are increasingly considered. The evaluation index system of blue-green spaces has also developed (Table 3).