Impact of urban expansion on land surface temperature in Dodoma and Morogoro metropolises, Tanzania
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Date
2021
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Publisher
TAJAS
Abstract
The study aims to evaluate the impact of metropolitan growth on land surface temperature
(LST) in Dodoma and Morogoro metropolises. The paper adopts remote sensing methods to extract
and analyze time-series Landsat satellite images from 2000 to 2018. An administered taxonomy
was applied to map urban land-use change. Thermal and reflectance bands analysis were employed
to retrieve and compare the Surface Temperature, Normalized Difference Vegetation Index (NDVI),
urban expansion patterns, and the overall growth prominence in the cities. The results highlight a
negative correlation between LST and NDVI, indicating that dissipating vegetation cover within
the two study areas was responsible for the increase in LST over the study period. The outcome
also showed that the metropolis of the study area rapidly expanded over the evaluation period with
impermeable surface from 1.6% in 2000 to 5.3% in 2018 while non-impermeable decreased from
98.4% in 2000 to 94.7% in 2018. Increasing LST of annual-average of 31% in 2000 to 32% in
2018 was mostly due to conversion to the built-up area from non-built area. Therefore, the study
concludes that LST is strongly influenced by land cover dynamics. The study suggests that planning
of African cities should incorporate with sustainable and resilient urban future in order to improve
the planning, compactness, sustainability and resilience of the urban environment.
Description
Conference Proceeding
Keywords
At-sensor brightness heat, SDGs, Dodoma, Morogoro, Urban planning, Land surface temperature