Application of 3D LiDAR air-ground integration technology in urban heat island research:a case study of Yanzhong greenspace in Shanghai

doi:10.13474/j.cnki.11-2246.2023.0116

Abstract

Abstract: Urban heat island effect is one of the most prominent ecological and environmental problems during the process of urbanization. Urban green space infrastructure is one of the key elements of the city, which can effectively alleviate the urban heat island. The planning and construction of Yanzhong greenspace is an important strategy of “natural based solution” given by Shanghai to alleviate the heat island effect. Based on the air-and ground-LiDAR data which are obtained from FEIMA UAV and its corresponding sensors, as well as land surface temperature from Landsat 8 Collection 2 Level 2 dataset, we analyze the cooling effect of Yanzhong green space in Shanghai, and the 3D vegetation volume distribution pattern and its influencing factors. The main conclusions are as the following: ① There is a directional cooling effect of Yanzhong greenspace, due to the influence of the surrounding landscape pattern. The sequence of the directional maximum cooling distance is the southeast, and followed by the southwest, northeast and northwest. While the maximum of the local cool island intensity is southwest, and the minimum is the southeast. The vegetation types greatly influence the cooling effect, with the ranking of their surface temperature from tree, grassland to shrub type. ② The higher 3D vegetation volume areas of Yanzhong greenspace mainly located in the northwest where nearby the highway, and dispersedly distributed across the greenspace. The 3D vegetation volume in Yanzhong greenspace is significantly negatively correlated with the distance from the road (D_road), and significantly positively correlated with the distance from the water body (D_water), while there is no significant correlation with the distance from the building (D_fw). The optimal model of the 3D vegetation volume is V_Yanzhong=224.354 56-1.513 65D_road+0.412 85D_water.Our study provides important theoretical and practical insights for urban heat island mitigation as well as urban greenspace planning and management.

Key words: urbanheat island effect, Yanzhong greenspace, 3D vegetation volume, 3D LiDAR

CLC Number:

P237

MENG Chen, WEI Yanhao, WU Caiyan, OUYANG Linke, LI Junxiang, ZHU Yi, LIU Jialin, WEI Bensheng, JIANG Ruijiao. Application of 3D LiDAR air-ground integration technology in urban heat island research:a case study of Yanzhong greenspace in Shanghai[J]. Bulletin of Surveying and Mapping, 2023, 0(4): 128-134.

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