Integrating geographical information systems,remote sensing,and machine learning techniques to monitor urban expansion:an application to Luanda,Angola  

作　　者：Armstrong Manuvakola Ezequias Ngolo Teiji Watanabe 

机构地区：[1]Graduate School of Environmental Science,Hokkaido University,Sapporo,Japan [2]Faculty of Environmental Earth Science,Hokkaido University,Sapporo,Japan

出　　处：《Geo-Spatial Information Science》2023年第3期446-464,共19页地球空间信息科学学报（英文）

基　　金：supported by the Japanese Government:Ministry of Science,Education,Sport and Technology“Mombukagakusho”a.k.a MEXT as part of a scholarship program;the APC was supported by the Open research fund program of LIESMARS,Wuhan University.

摘　　要：According to many previous studies,application of remote sensing for the complex and heterogeneous urban environments in Sub-Saharan African countries is challenging due to the spectral confusion among features caused by diversity of construction materials.Resorting to classification based on spectral indices that are expected to better highlight features of interest and to be prone to unsupervised classification,this study aims(1)to evaluate the effectiveness of index-based classification for Land Use Land Cover(LULC)using an unsupervised machine learning algorithm Product Quantized K-means(PQk-means);and(2)to monitor the urban expansion of Luanda,the capital city of Angola in a Logistic Regression Model(LRM).Comparison with state-of-the-art algorithms shows that unsupervised classification by means of spectral indices is effective for the study area and can be used for further studies.The built-up area of Luanda has increased from 94.5 km2 in 2000 to 198.3 km2 in 2008 and to 468.4 km2 in 2018,mainly driven by the proximity to the already established residential areas and to the main roads as confirmed by the logistic regression analysis.The generated probability maps show high probability of urban growth in the areas where government had defined housing programs.

关 键 词：Land use land cover(LULC) spectral index remote sensing geographical information systems(GIS) machine learning PQk-means logistic regression 

分 类 号：TP181[自动化与计算机技术—控制理论与控制工程]