An Investigation of Urban Heat Island Effect and Environmental Livability based on Remote Sensing Methods

Ziyan Li

doi:10.54097/mapvbb31

Authors

Ziyan Li

DOI:

https://doi.org/10.54097/mapvbb31

Keywords:

Remote sensing, Urbanization, urban heat islands, Correlation, Vegetation cover.

Abstract

Rapid urbanization has led to an increase in the urban heat island (UHI) effect. The UHI effect leads to localized high temperatures, reduced air quality, increased risk of heat stress and other diseases among residents. At the same time, it also reduces socialization among residents. Remote sensing technology, with its advantages of quantification, automation and real-time, can be used to analyze the UHI effect and further assess the livability of cities. In this paper, based on remote sensing image processing methods, the indexes of land surface temperature (LST), normalized vegetation index (NDVI), normalized difference build-up index (NDBI), and urban heat island intensity (UHII) were selected to analyze the scope of influence of UHI and urban livability. The important index of urban livability is human comfort, while UHI affects human comfort by influencing temperature and humidity. This paper concludes that the UHI effect is mainly reflected in the significant decrease in NDVI value and the significant increase in NDBI value. Meanwhile, there is a linear regression relationship between UHI and urban livability. In addition, UHI increases urban energy consumption and decreases environmental quality, destroying livability. This paper has proposed green city programs such as green roofs and cool sidewalks to improve the urban spatial structure. However, such programs still have the limitations of lower efficiency and higher cost. Therefore, in the future, UHI will be mitigated at the source by directly reducing solar radiation.

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