Author Affiliations
1Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, CAS, Beijing 100094, China2The Academy of Digital China, Fuzhou University, Fuzhou 350002, China3State Key laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, CAS, Beijing 100085, Chinashow less
Fig. 1. Spatial distribution of 200 cities around the world (a) and 80 cities along the Belt and Road (b)
Fig. 2. Spatial distribution of intercalibrated nighttime lights along the Belt and Road (a), and the distribution of intercalibrated nighttime lightsin Zhengzhou, China (b)
Fig. 3. Division of 1 km concentric ring layer and spatial distribution of urban land in Zhengzhou, China
Fig. 4. Net increase in urban land along the Belt and Road from 1992 to 2015
Fig. 5. Inter-annual changes of urban land area in the ten major sub-regions from 1992 to 2015
Fig. 6. Fitting curves of urban land density functions in 1992, 2003 and 2015
Fig. 7. Box-plots of fitting parameters α, c, and D of urban land density functions of different urban sizes in 1992, 2003 and 2015
Fig. 8. Fitting curves of urban land density functions of three different urban sizes along the Belt and Road
Fig. 9. Fitting curves of urban land density functions in the six sub-regions along the Belt and Road
Fig. 10. Statistics of kp for different urban sizes in 1992, 2003 and 2015
Fig. 11. Changes of main urban areas of different urban sizes from 1992 to 2003 and 2003 to 2015
Fig. 12. Comparison of the growth rates r2 and r1 for different urban sizes from 1992 to 2003 and 2003 to 2015
Fig. 13. Statistical relationship between the weighted lighting area and urban land area of 9 cities along the Belt and Road
Fig. 14. Statistical relationship between urban land area and urban population of 9 cities along the Belt and Road
Fig. 15. Comparative analysis of urban land area of ESA-CCI and GAIA in 1992, 2003 and 2015
变量 | N | 拟合优度 | 最优拟合模型 |
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线性模型 | | 幂律模型 | | 指数模型 | LN | POW | EXP |
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R2 > 0.5 | R2 < 0.5 | R2 > 0.5 | R2 < 0.5 | R2 > 0.5 | R2 < 0.5 | NTL | 80 | 57 | 23 | | 64 | 16 | | 65 | 15 | 16 | 14 | 50 | 城市人口 | 80 | 55 | 25 | 60 | 20 | 61 | 19 | 38 | 24 | 18 |
|
Table 1. Statistical regression analysis of urban land area, urban population and weighted lighting area along the Belt and Road