Abstract
Clarifying the spatial heterogeneity of urban heat island (UHI) effect is of great significance for promoting sustainable urban development. A GeoDetector was used to detect the influential natural and society factors. Natural factors (normalized difference vegetation index (NDVI), soil-regulating vegetation index (SAVI), normalized building index (NDBI), and modified normalized difference water index (MNDWI)) as well as society factors (road density (RDD), and population density (POPD)) were selected as driving factors to be tested for their explanatory power for land surface temperature (LST). Results indicated that the Moran’s I index value for the LST of the built-up area is 0.778. The top three factors influencing the LST were NDBI, NDVI, and SAVI, the explanatory power of which was 0.7593, 0.6356, and 0.6356, respectively. The interactive explanatory power for NDBI and MNDWI was 0.8108 and for NDBI and RDD was 0.8002, these two interactions are double enhanced interaction relationships. The results of this study play a guiding role in the development of urban thermal environment regulation schemes and ecological environment planning.
Highlights
Urbanization has become a global trend, and the world has become an urban world [1].According to the 2018 World Urbanization Prospects [2], more than 55% of the world’s population lives in urban areas
An evaluation of the single driving factor disclosed that the primary geographical factors are ranked by the value of the q-value as NDBI (0.7593) > NDVI (0.6356) = SAVI (0.6356) >
RDD (0.4619) > MNDWI (0.1239) > population density (POPD) (0.0352), which indicates that building indexes have the main influences on the spatial distribution of land surface temperature (LST) in the study area, followed by vegetation indexes
Summary
Urbanization has become a global trend, and the world has become an urban world [1]. According to the 2018 World Urbanization Prospects [2], more than 55% of the world’s population lives in urban areas. The increase in the urban population has contributed to the socio-economic development but has had negative impacts on the urban system, such as rapid urban expansion, air pollution, traffic congestion, increased land surface temperature (LST), and increased energy consumption [3,4]. One of the most serious problems is the urban heat island (UHI) effect, which severely affects the urban thermal environment [5]. Improving and optimizing the urban thermal environment, as well as creating good living spaces, are important for sustainable urban development
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