Analysis of the Urban Heat Island Phenomenon in Chau Doc City, An Giang Province, Vietnam

Abstract

ABSTRACT

This study aims to evaluate the relationship between the Normalized Difference Vegetation Index (NDVI) and Land Surface Temperature (LST) in Chau Đoc City, An Giang Province, during the period from 2014 to 2022, using remote sensing data and spatial analysis. The results reveal a significant inverse relationship between NDVI and LST, with the strongest correlation observed in 2018 (R=0.687), indicating the important role of vegetation in regulating urban temperature. However, by 2022, this correlation had declined markedly (R=0.264), reflecting a decrease in the cooling effectiveness of vegetation. Analysis of LST variations and thermal frequency maps shows that high-temperature zones are concentrated in the urban core and tend to expand into pier-urban areas. The study clearly identifies the increasing risk of urban heat island effects and proposes solutions such as green space planning, sustainable development management, and the application of remote sensing technology in urban thermal monitoring.