Spatiotemporal Monitoring of Urban Sprawl in Sheger City in Oromia Using GIS and Remote Sensing
No Thumbnail Available
Date
2024-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Urban sprawl, characterized by the rapid expansion of urban areas into rural lands, poses significant challenges to sustainable development. This research investigates urban sprawl in Sheger City, Ethiopia, utilizing Geographic Information Systems (GIS) and remote sensing techniques to analyze spatial growth patterns over 30 years from 1991 to 2022. Classification of land use types was performed using the Maximum Likelihood Algorithm, and accuracy assessment was conducted using Google Earth-measured sample points and an error matrix. In addition to the classification Urban sprawl indices is carefully selected and used to in quantifying and characterizing urban change. From this study five indices were used Urban Expansion Intensity Index (UEII), Normalized Difference Built-up Index (NDBI), Urban Index (UI), New Built-up Index (NBI), and Band Ratio for Built-up Area (BRBA) to quantifying and characterizing urban sprawl. Accuracy analysis revealed an accuracy range of 81.43% to 99.71% and Kappa statistics from 0.7936 to 0.9968, indicating effective land cover classification. Built-up areas expanded from 59.87 km² in 1991 to 200.07 km² in 2022. The UEII showed moderate to high expansion during 1991-2001 (0.1987), 2001-2011 (0.0522), and 2011-2022 (0.5631). NDBI, UI, and NBI indicated significant urban growth, especially from 1991 to 2001, with more balanced development by 2022. BRBA highlighted major expansions from 1991 to 2001, with stable growth afterward. The study concludes that Sheger City has experienced significant urban expansion over the past three decades, with varying intensities across different periods. The findings underscore the importance of monitoring urban growth to manage and mitigate the negative impacts of urban sprawl. Effective urban planning and management strategies are essential to ensure sustainable development and address the challenges associated with rapid urbanization. This research provides valuable insights for urban planners and policymakers, contributing to the sustainable development of Sheger City and potentially serving as a model for other rapidly urbanizing.
Description
Keywords
Urban Sprawl, UEII, NDBI, UI, NBI, BRBA