Abstract
Street greening, an indispensable element of urban green spaces, has played an important role in beautifying the environment, alleviating the urban heat island effect, and improving residents’ comfort. Vegetation coverage is a common index used for measuring street greening. However, there are some shortcomings in the traditional evaluation methods of vegetation coverage. Part of the vegetation coverage cannot be determined from a two‐dimensional perspective, such as shrubs and green walls. In this paper, the Sentinel‐2 image was used to extract the street fractional vegetation cover (SFVC) and the Baidu street view panoramas were used to extract the green view index (GVI). To overcome the lack of a single perspective from the street vegetation coverage evaluation, the above two indices were merged to construct a comprehensive street greening evaluation index (CSGEI). The research area is the Longhua District of Shenzhen city in Southern China. All three indices were divided into five classes using natural breakpoint methods based on previous research experience. The results showed that Baidu street view panoramas could effectively identify shrubs and green walls that were deficient in the Sentinel‐2 image. The GVI is a supplement to the street vegetation coverage. The SFVC and GVI were divided into five classes, from L1 to L5 implying a gradual increase in the percentage of the vegetated area. The result has shown that the SFVC was in the L1, accounting for 53.68%. After index merging, the process of accounting for the L1 decreased to 31.29%. The multiperspective integrated CSGEI could comprehensively measure the distribution information of street greening and guide the planning and management of urban green landscapes.
Highlights
A forest is an ecosystem of trees and countless forms of biodiversity [1]; rapid urbanization and land-use changes near cities have led to changes in the forest structure and composition [2]
The street fractional vegetation cover (SFVC) and green view index (GVI) were divided into five classes, from L1 to L5 implying a gradual increase in the percentage of the vegetated area
The lowest street SFVC index was found for Tao Yuan road, whose average SFVC was 0%, but the GVI for Tao Yuan Road was 10.91%
Summary
A forest is an ecosystem of trees and countless forms of biodiversity [1]; rapid urbanization and land-use changes near cities have led to changes in the forest structure and composition [2]. As an essential element of the urban forest, street greening has the functions of purifying the air, dividing traffic routes, preventing fire, and beautifying cities [3]. Street greening is very important to improve citizens’ satisfaction with their living environment and promote sustainable urban development [4]. Urban street green spaces are divided into four functions—beautification function, ecological environment function, leisure activity function, and landscape culture function. With these functions, urban street green spaces directly or indirectly provide all cityrelated services [5]. Urban street green spaces have important relationships with mental health, air pollution, and travel behavior [6,7,8]. The qualitative and quantitative analyses of city street greening are of great significance
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