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Remote Sensing Technology and Application  2022, Vol. 37 Issue (4): 897-907    DOI: 10.11873/j.issn.1004-0323.2022.4.0897
    
Research on the Spatial-Temporal Process of Urbanization in Chengdu-Chongqing Region based on Nighttime Light from 2000 to 2018
Han Wang1,2(),Ziyuan Hu3(),Fuquan Li3,Yuke Zhou1,2
1.Key Laboratory of Ecosystem Network Observation and Modeling，Institute of Geographic and Nature Resources Research，Chinese Academy of Sciences，Beijing 100101，China
2.University of Chinese Academy of Sciences，Beijing 100049，China
3.No. 7 Geological Brigade，Shandong Bureau of Geology and Mineral Resources Exploration and Development，Linyi 27600，China
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Abstract  

Chengdu-Chongqing urban agglomeration is gradually becoming the growth pole of economic development in western China. Exploring the spatial and temporal pattern of urbanization in Chengdu-Chongqing urban agglomeration has a guiding role for regional coordinated development. Based on the integrated nighttime light remote sensing data from 2000 to 2018， this paper extracted the spatial scope of multi-stage built-up areas of urban agglomerations， using noctilucent scale statistics， standard ellipse， rank-size rule and spatial autocorrelation and other indicators and models to quantitatively analyze the spatial and temporal process of urbanization in this region. The main conclusions are as follows： （1） the multi-year average error of the built-up area extraction with the combination of light and statistical data is 1.27%， which is effective in Chongqing， Chengdu and Mianyang. （2） In the past 19 years， the scale of noctilucent in Chengdu-Chongqing cities increased significantly， with an overall cumulative increase of 5.658 times. After 2010， the scale of light in Chengdu-Chongqing urban agglomeration expanded significantly； （3） The rank-scale of cities in the region shifted from the concentrated development of high-ranking cities to the coordinated and balanced development of the region， and small and medium-sized cities all expanded to varying degrees； （4） The center of gravity of urban agglomeration is located in Anyue County， Ziyang City， Sichuan Province. The center of gravity movement is mainly in the southeast direction， and the spatial pattern evolves along the axis of "Chengdu-Chongqing" from northwest to southeast， indicating that the southeast metropolitan circle dominated by Chongqing has a stronger radiating and driving role and has more influence on the development of urban agglomeration. （5） The spatial agglomeration degree of Chengdu-Chongqing urban agglomeration is gradually strengthened. The overall pattern of cold hot spots is characterized by a large proportion of cold spots and a low proportion of hot spots. The hot spots are mainly located in the main urban areas of Chengdu and Chongqing and their surrounding towns. This study reveals the characteristics and hotspots of balanced development of Chengdu-Chongqing urban agglomeration， which can be used as a reference for future urban function planning and investment decisions.
Key words:  Nighttime light      Urban expansion      Rank-size rule      Temporal-spatial evolution characteristic      Chengdu-Chongqing urban agglomeration     
Received:  08 November 2021      Published:  28 September 2022
:  P237  
Corresponding Authors:  Ziyuan Hu     E-mail:  wanghanzora@163.com;hzy0618@163.com
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Han Wang
Ziyuan Hu
Fuquan Li
Yuke Zhou

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Han Wang,Ziyuan Hu,Fuquan Li,Yuke Zhou. Research on the Spatial-Temporal Process of Urbanization in Chengdu-Chongqing Region based on Nighttime Light from 2000 to 2018. Remote Sensing Technology and Application, 2022, 37(4): 897-907.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2022.4.0897     OR     http://www.rsta.ac.cn/EN/Y2022/V37/I4/897

Fig.1  Map of the study area
Fig.2  Fitting relationship between DMSP/OLS and NPP/VIIRS
城市建成区划分阈值（DN值）
2000年2005年2010年2015年2018年
成都市46.0050.0055.0053.4152.78
重庆市39.0047.0041.0046.9048.92
德阳市30.0049.0052.0050.8751.52
广安市20.0045.0038.0050.2349.57
乐山市17.0029.0035.0046.9049.57
泸州市22.0031.0024.0041.2444.13
眉山市24.0028.0036.0045.5348.25
绵阳市45.0044.0053.0048.9249.57
南充市32.0045.0046.0049.5752.15
内江市18.0039.0034.0048.2549.57
遂宁市14.0041.0043.0047.5849.57
雅安市19.0024.0030.0042.7046.22
宜宾市22.0040.0031.0043.4246.22
达州市26.0051.0042.0045.5347.58
资阳市22.0038.0039.0044.1350.23
自贡市17.0034.0028.0039.7444.83
Table.1  The extraction threshold values of built-up areas in different periods of each city
Fig.3  Extraction results of built-up areas in Chongqing and Chengdu
Fig.4  Statistics on the scale of nighttime light in various cities
Fig.5  The growth of nighttime light in Chengdu-Chongqing Urban Agglomeration
Fig.6  The cumulative growth rate of nighttime light in various cities
Fig.7  The changes of the rank-scale logarithmic of Chengdu-Chongqing urban agglomeration
Fig.8  Center of gravity migration in Chengdu-Chongqing urban agglomeration
城市群Moran’s I
2000—20052005—20102010—20152015—2018
成渝城市群-0.430-0.0080.0830.134
Table.2  Global autocorrelation index of urban expansion in Chengdu-Chongqing urban agglomeration in different periods
Fig.9  Analysis on hot spots of urban space expansion in Chengdu-Chongqing urban agglomeration
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