Ecological Evaluation of Urban Heat Island using Landsat 8 OLI/ TIR Data: Case Study of Kaduna Metropolis, Nigeria
Keywords:
Ecology, UHI, LST, UTFVI, Thermal Remote SensingAbstract
The ecological impact of the Kaduna metropolis's Urban Heat Island (UHI) was assessed using Landsat 8 OLI & TIRS data from 2019. Land surface temperature (LST), a measure acquired from band 10 (Thermal Infrared band) using a Single-Channel algorithm, was used to get the temperature variation of the metropolis. The Normalized Difference Vegetation Index (NDVI) and the Normalized Difference Build-Up Index (NDBI) were used to determine the validity of LST. The urban thermal field variance index was used to determine the metropolis level of thermal comfort (UTFVI). The result from the LST of the metropolis ranges from 26.52 °C and 41 °C with the UHI observed in zones with high concentrations of human activities. According to the UTFVI associated with UHI, 76.23 % of the metropolis has a normal to excellent microclimate for living, whereas 23.77 % has bad to worst heat stress. As a result, the public and government must develop UHI mitigation methods to improve the metropolis' quality of life.