Quantifying the relationship between impervious surface and urban heat environment in the southeast megalopolis of Vietnam
Paper Details
Quantifying the relationship between impervious surface and urban heat environment in the southeast megalopolis of Vietnam
Abstract
The impervious surface (IS) in urban area is known as the main component to impact on urban climate as it changes the land surface temperature (LST). It is also a kind of urbanization indicator when the land surface is changed by constructing materials. This paper presents the study on the relationship between LST and IS, carried out by investigating with urban factors extracted directly from the satellite image (IS, vegetation ND and open water WA) and the official census (population density PD) for Ho Chi Minh City (HCMC), a megalopolis of Vietnam rapidly developed from natural to artificial impervious landscape. IS was extracted by the integrated technique when using Maximum Likelihood Classification method with the thresholding NDVI. The final classification results achieved high accuracy (overall accuracy about 95% and Kappa coefficient about 0.9). LST was retrieved from the thermal infrared band using Planck law and corrected to the surface emissivity. The statistical analysis was carried out with multivariate regression between LST and IS, ND, WA, PD. The results show that LST is highly correlated to IS (r=0.873) and has the positive relationship with IS and PD, but negative relationship with ND and WA. In the linear multivariable regression by weighted least squares method with the IS as the weighted variable, it was found that IS variable plays a highest positive role (Beta=0.42) impacting on the change of LST in HCMC. This research can be used as reference to support the management of urban thermal environment and protect public healthy.
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