02. THE RELATIONSHIP BETWEEN LST, NDVI AND NDBI INDICATORS, AN INVESTIGATION USING LANDSAT IMAGES IN HOA BINH, VIETNAM

Tóm tắt

The study uses Landsat 8 OLI-TIRS satellite images to extract indices and Pearson correlation analysis techniques to evaluate the correlation in the distribution between land surface temperature LST), vegetation index (NDVI), normalized difference built-up index (NDBI) in Hoa Binh province. The results indicate that areas with expansion and increased density of impermeable surfaces are characteristic causes contributing to increased temperatures in urban areas compared to surrounding areas and tend to be 5 - 7 °C higher than the average temperature of the entire study area. The correlation coefficient values ​​reached r = - 0.96791, r = 0.9628, and r = -0.9352 for the relationship between LST-NDVI, LST-NDBI, and NDVI-NDBI respectively. The study results show inter-relationships and transformations of the three indicators in the research context, where urban land temperature and Urban Heat Island (UHI) are raised by built-up areas and in contrast, reduced by vegetated areas. As a result, urban green space would be a driver to mitigate the harmful impact of the "heat island" effect in urban areas. Aim to strengthen concentrated green areas and vegetation in land areas that are less favorable for construction.