撒哈拉以南城市的城市化及其对城市农业的影响:来自尼日尔尼亚美的基于证据的遥感数据

Ibrahim Abdoul Nasser, E. Adam
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引用次数: 0

摘要

城市化是城市转变为大片扩张区域的过程。城市化与人口持续增长相结合,使粮食安全成为可持续发展的关键。城市化对建成区和城市周边地区的农业用地构成了威胁。它导致城市和城市周边地区的农田迅速消失和/或完全改变。为了监测农田的变化,了解城市景观的变化变得越来越重要。在这项研究中,使用了多时相大地遥感卫星图像来分析城市化对尼亚美市城市农业的影响。使用支持向量机(机器学习)算法确定了城市景观的变化。研究结果表明,1975 年至 2020 年间,种植农作物的土地面积从 3428 公顷减少到 648 公顷,建成区面积从 1352 公顷增加到 11596 公顷。城市化和人口增长是尼亚美城市景观变化的主要驱动力。与 1975 年和 2020 年的数值相比,裸地、岩石和植被等级也有所减少,而水稻和水体等级则略有增加。这项研究证明了遥感技术在显示城市化对城市农业影响方面的重要性。这些结果可以帮助城市规划者和资源管理者做出决策,并采取对城市发展至关重要的可持续缓解措施。
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Urbanisation in Sub-Saharan Cities and the Implications for Urban Agriculture: Evidence-Based Remote Sensing from Niamey, Niger
Urbanisation is the process whereby cities are transformed into large sprawling areas. Urbanisation combined with a continuous increase in population makes food security crucial for sustainable development. Urbanisation poses a threat to agricultural land use within built-up and peri-urban areas. It has resulted in the rapid disappearance and/or total change of agricultural farmland in urban and peri-urban areas. To monitor the changes in agricultural farmland, an understanding of changes in the urban landscape is becoming increasingly important. In this study, multi-temporal Landsat imagery were used to analyse the impact of urbanisation on urban agriculture in the city of Niamey. Changes in the urban landscape were determined using the support vector machine (machine learning) algorithm. Results of this study showed a decrease in land with crops from 3428 ha to 648 ha and an increase in built-up areas from 1352 ha to 11,596 ha between 1975 and 2020. Urbanisation and population growth are the main drivers of urban landscape change in Niamey. There was also a decrease in bare land, rock and vegetation classes, while a small increase in rice and water body classes, comparing the 1975 and 2020 values. This study demonstrates the importance of remote sensing in showing the implications of urbanisation on urban agriculture. These results can assist city planners and resource managers in decision-making and adoption of sustainable mitigation measures which are crucial for urban development.
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