APPLICATION OF MULTI-TEMPORAL LANDSAT IMAGES TO ANALYZE THE RELATIONSHIP BETWEEN THE LAND SURFACE TEMPERATURE (LST) AND THE LAND USE LAND COVER (LULC) IN HO CHI MINH CITY

Urban sprawl has changed the land use land cover (LULC) in Ho Chi Minh City (HCMC). It has caused the gradual decline of the natural vegetation and rapid increase of the impervious surface, which leads to the heat storage capacity of the urban surface being on the rise. There is a land surface temperature (LST) difference between the urban center and surrounding areas and it creates the urban heat island phenomenon (UHI). This study used Landsat 4, 5, and Landsat 8 satellite image data from 1990 to 2020 with the GIS algorithms on ENVI and ArcGIS to analyze and estimate the correlation between the LULC and the LST in HCMC. The Kappa coefficients of the LULC classifications were all over 0.8 in 1990 - 2020 period. The total area of impervious surface has increased by 57,338 hectares over the past 30 years; while the total area of natural green has decreased by 19,116 hectares. The LST has remarkably increased in the areas of construction lands, industrial zones, and impervious surfaces, with an average increase from 22 degrees C to 27 degrees C. While the LST in the others such as the vegetation surface and water surface were slower, from 20 degrees C to 23 degrees C. The solution of enhancing the urban green space was suggested to mitigate the increasing LST impact on HCMC.