RESEARCH ARTICLE How green are the streets? An analysis for central areas of Chinese cities using Tencent Street View Ying Long1*, Liu Liu2 1 School of Architecture and Hang Lung Center for Real Estate, Tsinghua University, Beijing, China, 2 China Academy of Urban Planning and Design, Shanghai, China *
[email protected] Abstract Extensive evidence has revealed that street greenery, as a quality-of-life component, is a1111111111 important for oxygen production, pollutant absorption, and urban heat island effect mitiga- a1111111111 tion. Determining how green our streets are has always been difficult given the time and a1111111111 money consumed using conventional methods. This study proposes an automatic method a1111111111 using an emerging online street-view service to address this issue. This method was used to a1111111111 analyze street greenery in the central areas (28.3 km2 each) of 245 major Chinese cities; this differs from previous studies, which have investigated small areas in a given city. Such a city-system-level study enabled us to detect potential universal laws governing street greenery as well as the impact factors. We collected over one million Tencent Street View OPEN ACCESS pictures and calculated the green view index for each picture. We found the following rules: Citation: Long Y, Liu L (2017) How green are the (1) longer streets in more economically developed and highly administrated cities tended to streets? An analysis for central areas of Chinese be greener; (2) cities in western China tend to have greener streets; and (3) the aggregated cities using Tencent Street View. PLoS ONE 12(2): e0171110.