Accessibility Assessment of Urban Green Space: A Quantitative Perspective

The primary goal of this research was to study the method to calculate the green space accessibility, which was used to assess the capacity and chance of inhabitants to approach green space. Many factors affecting the green space accessibility were taken into account, such as attraction of green space, distribution of population, land use pattern and traffic cost. Based on GIS software, the study area was divided into regular grids with the size of 500 meters. For each grid, the resistance for accessing a green space was calculated regarding to qualified factors based on gravity & spatial interaction model and shortest path analysis. Then the green space accessibility of whole city was accumulated by the sum of all grids´ computing results. Taking Beijing city as a case study, SPOT imagery in three periods were used to acquire information of green space to assess its accessibility and check the evolution process.