Abstract

Lagos, Nigeria’s economic hub and one of Africa’s fastest-growing cities, has experienced remarkable urban growth due to rapid urbanization. The city has recently faced persistent urban flooding due to unsustainable growth and inadequate data for proper planning. Therefore, we analyzed urban growth and land cover change in Lagos, Nigeria, using multi-temporal datasets downloaded from the United States Geological Survey (USGS) at an interval of 10 years from 1990–2020. We employed the maximum likelihood classification and post-classification change detection to analyze the city’s urban growth and change dynamics. The study revealed three phases of growth in Lagos and a substantial increase in the city’s built-up area from 496 km² in 1990 to approximately 860 km² in 2000. This area increased further to 1113 km² in 2010, and presently over 1256 km². The result also revealed a substantial decrease in the city’s vegetation, water bodies, and bare soil by approximately 398 km², 246 km², and 115 km², respectively, between 1990 and 2020. These changes contribute to urban flooding, the prominent natural and human-induced disaster in the city. Therefore, this study’s findings provided the historical and scientific data for the effective planning, management, and sustainable development of the city.

摘要

拉各斯是尼日利亚的经济中心，也是非洲发展最快的城市之一，由于快速的城市化进程，其城市发展迅猛。由于不可持续的增长和缺乏适当规划的数据，该市最近面临持续的城市洪灾。因此，我们使用从1990年至2020年的10年间从美国地质调查局（USGS）下载的多时相数据集，分析了尼日利亚拉各斯的城市增长和土地覆盖变化。我们采用最大似然分类和分类后变化检测来分析城市的城市增长和变化动态。研究表明，拉各斯的增长分为三个阶段，城市建成区的面积从1990年的496 km ²大幅增加到大约860 km ²面积在2000年增加到2010年的1113 km ²，目前超过1256 km ²。结果还显示大约398公里城市的植被，水体和土壤裸露大幅下降²，246公里²，和115公里²，分别是1990年和2020年之间的这些变化对城市洪水贡献，突出自然和城市中的人为灾难。因此，本研究结果为城​​市的有效规划，管理和可持续发展提供了历史和科学数据。