Spatiotemporal Evolution of West Africa's Urban Landscape Characteristics Applying Harmonized DMSP-OLS and NPP-VIIRS Nighttime Light(NTL)Data  

作　　者：SONO Douglas WEI Ye CHEN Zuoqi JIN Ying 

机构地区：[1]School of Geographical Sciences,Northeast Normal University,Changchun 130024,China [2]Natural Resources Institute of Jilin Province,Changchun 130024,China [3]Key Laboratory of Spatial Data Mining and Information Sharing of Ministry of Education,National&Local Joint Engineering Research Center of Satellite Geospatial Information Technology,Fuzhou University,Fuzhou 35002,China [4]The Academy of Digital China,Fuzhou University,Fuzhou 350002,China [5]School of Humanities and Law,Northeastern University,Shenyang 110169,China

出　　处：《Chinese Geographical Science》2022年第6期933-945,共13页中国地理科学（英文版）

基　　金：Under the auspices of National Natural Science Foundation of China(No.41971202)。

摘　　要：Investigating urban expansion patterns aids in the management of urbanization and in ameliorating the socioeconomic and environmental issues associated with economic transformation and sustainable development.Applying Harmonized Defense Meteorological Satellite Program-Operational Line-scan System(DMSP-OLS)and the Suomi National Polar-Orbiting Partnership-Visible Infrared Imagery Radiometer Suite(NPP-VIIRS)Nighttime Light(NTL)data,this paper investigated the characteristics of urban landscape in West Africa.Using the harmonized NTL data,spatial comparison and empirical threshold methods were employed to detect urban changes from 1993 to 2018.We examined the rate of urban change and calculated the direction of the urban expansion of West Africa using the center-of-gravity method for urban areas.In addition,we used the landscape expansion index method to assess the processes and stages of urban growth in West Africa.The accuracy of urban area extraction based on NTL data were R^(2)=0.8314 in 2000,R^(2)=0.8809 in 2006,R^(2)=0.9051 in 2012 for the DMSP-OLS and the simulated NPP-VIIRS was R^(2)=0.8426 in 2018,by using Google Earth images as validation.The results indicated that there was a high rate and acceleration of urban landscapes in West Africa,with rates of 0.0160,0.0173,0.0189,and 0.0686,and accelerations of 0.31,0.42,0.54,and 0.90 for the periods of 1998–2003,2003–2008,2008–2013,and 2013–2018,respectively.The expansion direction of urban agglomeration in West Africa during 1993–2018 was mainly from the coast to inland.However,cities located in the Sahel Region of Africa and in the middle zone expanded from north to south.Finally,the results showed that the urban landscape of West Africa was mainly in a scattered and disordered’diffusion’process,whereas only a few cities located in coastal areas experiencing the process of’coalescence’according to urban growth phase theory.This study provides urban planners with relevant insights for the urban expansion characteristics of West Africa.

关 键 词：urban expansion nighttime light remote sensing DMSP-OLS(Defense Meteorological Satellite Program-Operational Line-scan System) NPP-VIIRS(Suomi National Polar-Orbiting Partnership-Visible Infrared Imagery Radiometer Suite) spatiotemporal evolution West Africa 

分 类 号：TU984.4[建筑科学—城市规划与设计]