Aakriti GROVER, Central University of Tamil Nadu, India
The rapid growth of urbanization, which has resulted in large-scale urban expansion, has resulted in a massive conversion of green spaces, water bodies and open spaces to impervious surfaces, directly influencing the urban environment. The microclimatic changes leading to formation of intense urban heat islands (UHI) are most significant environmental impacts of urbanization. This phenomenon largely depends on Land Surface Temperature (LST) that is affected by the morphology, density and composition of the surface.
The present research intends to analyze the spatio-temporal changes in land surface temperature using Landsat Series Data. Further it tries to examine the intensity of an urban heat island effect for the Ranchi Metropolitan Area (RMA) between 1995 to 2020. According to the findings, dense concentrations of urban built-ups are dominated by substantially greater temperatures than green covers, with low to moderate temperatures. Spatial Correlation between LST, NDBI and NDVI is established to further investigate the causes of microclimatic changes. It is observed that although NDVI and LST showed a negative relationship, in 1995, 2000 and 2005 the graph showed a very weak relationship; but from 2010 upto 2020, the relationship was moderate negative correlation, i.e. (R2 = 0.035 to 0.056). On the other hand, a steady positive correlation can be observed throughout the study period between LST and NDBI. In addition, the Urban Thermal Field Variance Index (UTFVI) indicates that most parts of the city have bad to worst ecological conditions for the people to live.
Mots clés : NDVI|NDBI|UTFVI|Landsat|Urban Heat Island
A105355AG