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Remote Sensing Technology and Application  2022, Vol. 37 Issue (2): 342-353    DOI: 10.11873/j.issn.1004-0323.2022.2.0342
Reconstructing Urban Expansion and Analyzing Land Cover Change of Xining and Lhasa in the Past 70 Years based on Multi-source Spatiotemporal Information
Changqing Guo1(),Xuexia Zhang1,Yali Hou2,3,Wenhui Kuang2()
1.Key Laboratory of State Forestry Administration of Soil and Water Conservation,School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China
2.Key Laboratory of Land Surface Pattern and Simulation,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China
3.University of Chinese Academy of Sciences,Beijing 100049,China
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The cities of Xining and Lhasa are hot spots of human activities on the Qinghai-Tibet Plateau, and their development process has an important impact on the socio-economic development of the Qinghai-Tibet Plateau. This paper reconstructed urban expansion in Xining and Lhasa cities based on remote sensing images, urban planning maps and historical maps in circa 1949, circa 1978, 1990, 2000, 2010 and 2018, and urban impervious surface and green space component information since 2000. We analyzed the temporal and spatial characteristics of urban expansion in built-up area of Xining and Lhasa since circa 1949, and revealed the characteristics of the impact of socioeconomic factors and policy factors on urban land use/cover changes. The results show that: (1) Since the founding of the People's Republic of China, built-up area of Xining and Lhasa has continued to expand, showing a non-linear growth trend. The urban land area has increased from 1.98 km2 and 1.10 km2 in circa 1949 to 79.26 km2 and 77.04 km2 in 2018. The urban expansion of Xining’s built-up area presents a cross-shaped expansion trend, and Lhasa presents a circle-extensive expansion mode; (2) Since 2000, the urban greening level of Xining and Lhasa has improved significantly. From 2000 to 2018, the urban impervious surface area of Xining and Lhasa increased from 36.91 km2 and 21.56 km2 to 55.34 km2 and 48.21 km2, and the urban green space area increased from 10.78 km2 and 8.48 km2 to 19.21 km2 and 20.35 km2, and the average annual expansion rates were 0.47 km2/a and 0.66 km2/a. The percentage of impervious surface in the built-up area has dropped from 74.09% and 66.21% to 69.82% and 62.58%, and the proportion of urban green space has increased from 21.64% and 26.05% to 24.24% and 26.41%; (3) Xining and Lhasa's urban population growth, economic development and relevant national policies are closely related with the urban expansion of the main urban area and its land use/cover changes. The urban expansion stage of the built-up area is related with the population growth, economic development stage and the implementation time of relevant national policies. Land use/cover change in built-up area is highly related with urban planning-related policies, especially landscaping construction, which has significantly increased the area of urban green space, and the proportion of urban green space has increased significantly compared with 2000.

Key words:  Urban expansion      Urban land use/cover change      Impervious surface      Remote sensing monitoring     
Received:  09 November 2020      Published:  17 June 2022
ZTFLH:  TP79  
Corresponding Authors:  Wenhui Kuang     E-mail:;
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Changqing Guo
Xuexia Zhang
Yali Hou
Wenhui Kuang

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Changqing Guo,Xuexia Zhang,Yali Hou,Wenhui Kuang. Reconstructing Urban Expansion and Analyzing Land Cover Change of Xining and Lhasa in the Past 70 Years based on Multi-source Spatiotemporal Information. Remote Sensing Technology and Application, 2022, 37(2): 342-353.

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Fig.1  Remote sensing images of Xining and Lhasa
数据名称分辨率 /数据类型数据使用数据来源
Landsat MSS80 m生产中国土地利用/覆盖变化数据集http:∥
Landsat TM/ETM+/OLI30 m生产中国土地利用/覆盖变化数据集、中国城市不透水层和绿地空间组分数据集http:∥
HJ?1A/B30 m生产中国土地利用/覆盖变化数据集、质量控制和精度评价http:∥
GF-12/8 m生产中国土地利用/覆盖变化数据集、质量控制和精度评价http:∥
GF-21/4 m质量控制和精度评价http:∥
ZY-33.5 m、2.5 m质量控制和精度评价http:∥
Google Earth0.54/8 m质量控制和精度评价https:∥
SRTM DEM90 m生产中国城市不透水层和绿地空间组分数据集http:∥
中国城市不透水层和绿地空间组分数据集(2000、2010和2018年)30 m城市地表覆盖变化分析
Table 1  Main data sources
Fig 2  The technological route of this study
Table 2  The current status of urban land area in Xining and Lhasa in the past 70 years
城市扩展面积 /km2城市扩展速度 /(km2/a)城市扩展比例 /%城市扩展面积 /km2城市扩展速度 /(km2/a)城市扩展比例 /%
1949基准年?~1978基准年?17.630.61890.4015.020.631 365.45
1949基准年~201877.281.123903.0375.941.136 903.64
Table 3  Urban land expansion in Xining and Lhasa in the past 70 years
Fig 3  Urban expansion and urban land area changes in Xining and Lhasa in the past 70 years
Table 4  Urban land cover area and proportion of Xining and Lhasa from 2000 to 2018
Fig 4  Urban land cover changes in Xining and Lhasa from 2000 to 2018
Fig 5  Changes in population, urbanization level and GDP of Xining and Lhasa
Fig 6  Changes in the area and per capita area of urban parks green space in Xining and Lhasa
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