Spatial analysis of urban expansion, land-use dynamics and its effects on land surface temperature in Oyo town, Southwestern Nigeria

Rofat Dolapo Salam, Isaac Ayo Oluwatimilehin, Ayansina Ayanlade

Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

Abstract

This paper assessed the expansion of land use and land cover that occurred in Oyo
State, Southwestern Nigeria, over a period of thirty-year. This was to assess urban
expansion, landuse dynamics and their efects on land surface temperature in the area.The study used four multi-date imageries of the area. Landsat 7 ETM+, 1990, 2000,2012, and Landsat 8 OLI/TIR, 2021 were collected from the United States Geological
Survey (USGS) website were used. The ArcGIS 10.1 environment was utilised to clip
the area of interest, and ERDAS Imagine remote sensing software was employed to efciently improve and categorise the images. The images were then divided into fve
major: cultivation, built-up area, vegetation, water body, and bare soil using a maximum likelihood supervised classifcation algorithm. These categories were then utilised
to conduct time series analysis or change detection analysis.
Results of this study revealed that the built-up area has changed over the preceding
three decades because of urban expansion. The built-up area increased from 19.83 km2
to 35.67 km2
in 2012 and 44.84 km2
in 2021, indicating increases of 14.93% to 79.87%
and 25.71%, respectively, whereas the vegetative land cover decreased from -0.11%
to -3.01 48% and 12.75% during the study period. Findings revealed that anthropogenic factors including urbanisation and agricultural expansion, have signifcantly altered the surface and atmospheric characteristics of the study area, causing a variety of heat patterns within the area. The built-up area had average temperatures
between 35.05 °C and 36.16 °C between 1990 and 2021, which indicated a higher
temperature with evidence of an urban heat island.
This study concludes that the city’s land surface temperature is rising and that the
expanding built-up area’s density and a corresponding decline in vegetation over time
signifcantly impact it. Therefore, the study suggests cultivating and maintaining
trees, promoting green environment,, public awareness, campaigns and education
on actions that aggravate high temperatures are also required.
OriginalspracheEnglisch
Aufsatznummer15
FachzeitschriftCity and Built Environment
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - 1 Nov. 2023
Extern publiziertJa

ÖFOS 2012

  • 507002 Bevölkerungsgeographie

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