Park green space (PGS) is an important part of urban ecosystem and green infrastructure, and the ease of access to PGS is closely related to the health of residents. A growing number of studies have attempted to identify accessibility disparities, but results have varied because of the travel mode choice and the measurement method. This study proposes a dynamic Huff two-step floating catchment area (H2SFCA) method based on map service API (Application Programming Interface) to assess the accessibility of PGS, with the Gini coefficient and bivariate local Moran’s I used to analyze accessibility equity. Results show that: (1) driving and biking modes have more significant spatiotemporal compression effects than dynamic modes, public transit, and walking mode. (2) The accessibility values and spatial patterns vary significantly by travel mode. The PGS availability pattern at the local level is more uneven than the distribution of accessibility at the regional level. In comparison with dynamic travel modes, the accessibility values for the single travel mode are more likely to be overestimated or underestimated. (3) The PGS accessibility by the dynamic modes generally has better spatial equity and residents can select suitable travel tools to acquire more equitable park services. In addition, there is a significant accessibility difference between dynamic driving-based mode and dynamic transit-based mode in four subdistricts, which are mainly located in the south of Tianhe District. The public transport facilities linking parks in these areas need to be optimized. This study further improves the accessibility evaluation method, with the findings conducive to the implementation of refined PGS planning and management.
Urban public open space plays an important role in ensuring residents' daily leisure activities and improving the quality of urban ecological environment. Therefore, the reasonable and scientific evaluation of its recreational services can promote sustainable urban development. This paper selects Dongguan as a case area, and establishes an evaluation index system for public open space recreational services using GIS from three aspects, including service satisfaction, service capability, and supply-demand balance. The results show that the performance of recreational services in the towns of Dongguan city is related to the distribution of green space and population density. High-performing towns are located in the central area of Dongguan, and the towns with medium performance are mainly distributed around the central area. The towns with lower performance are distributed in the northeastern and northwestern fringe areas of Dongguan. To meet the needs of recreational services, it is recommended to prioritize the construction of pocket parks and street green space parks.
As the main component of urban problems, urban waterlogging disasters restrict the development of urbanization and the sustainable development of cities. Based on the three core characteristics of resilient cities, including adaptability, coping ability and recovery, this paper uses an entropy method to establish an urban resilience evaluation index system for waterlogging disasters, which consists of disaster-causing, disaster-resistant and disaster-bearing factors. Then, the resilience index of distinct districts in Shenzhen against waterlogging disasters is analyzed based on GIS technology, and the relevant improvement strategies are proposed. The results show that the resilience level from high to low is Baoan District, Futian District, Nanshan District, Longgang District, Longhua District, Luohu District, Guangming District, Pingshan District, Dapeng New District and Yantian District, and the urban resilience level can be improved by updating urban drainage facilities, strengthening ecological protection and environmental construction, and improving urban disaster-bearing soft systems.
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