BackgroundTemporal change detection of informal settlement was conducted using geographic information system and remote sensing in order to evaluate the land use land cover change (LULCC) in Jimma city, southwestern Ethiopia. We analyzed the LULCC since 1997 using Landsat imagery of 1997, and aerial photography of 2007 and 2017. Qualitative and quantitative data was also collected from city residents by using structured questionnaires focusing on peoples’ perceptions to understand the pattern of informal settlements in the study area. Maximum likelihood supervised classification methods was employed to create the signature class of the five land cover classes: built up, vegetation, barren land, open land and agricultural land.ResultsThe results indicated that the informal settlement has been increased in the peripheries from 29% in 1997, 37% in 2007 and 41% in 2017. This study focuses on the continued transformation of various land uses into informal settlements, causing encroachment on agricultural and open land particularly in the city periphery. The unprecedented population growth and unplanned development activities in urban areas results in urban agglomeration, which increase the price of land market for construction. This implies that rapid population growth, shortage of formal housing and unaffordable cost of formal housing for urban dwellers contributed to informal settlements.ConclusionsIncreasing urbanization and rapid population growth are often associated with the development of urban informal settlements. Informal settlements and urban informality are the common problems particularly in the periphery of Jimma city. These results can be used as a basis for informal settlement assessment in other cities in the country and beyond.

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使用 GIS 和遥感技术开发非正式住区的时空模式：以埃塞俄比亚西南部吉马市为例

背景 为了评估埃塞俄比亚西南部吉马市的土地利用土地覆盖变化（LULCC），使用地理信息系统和遥感进行了非正式住区的时间变化检测。我们使用 1997 年的 Landsat 图像和 2007 年和 2017 年的航空摄影分析了自 1997 年以来的 LULCC。还通过使用结构化问卷从城市居民那里收集了定性和定量数据，重点是人们的看法，以了解研究区的非正规住区模式. 采用最大似然监督分类方法创建了建成区、植被、荒地、空地和农用地五个土地覆盖类别的特征类别。结果结果表明，周边地区的非正规聚落从2019年的29%增加。 1997年，2007 年为 37%，2017 年为 41%。本研究重点关注各种土地用途向非正规住区的持续转变，导致对农业和开放土地的侵占，特别是在城市外围。城市地区前所未有的人口增长和无计划的开发活动导致城市群，从而提高了建设用地市场的价格。这意味着人口快速增长、正规住房短缺和城市居民无法负担的正规住房成本促成了非正规住区。结论城市化进程的加快和人口的快速增长往往与城市非正规住区的发展有关。非正规住区和城市非正式是普遍问题，特别是在季马市周边地区。