Journal of Geographical Sciences ›› 2021, Vol. 31 ›› Issue (2): 265-280.doi: 10.1007/s11442-021-1846-8
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HUANG Huiping1,2(), CHEN Wei1,2, ZHANG Yuan1,*(
), QIAO Lin1,2, DU Yunyan3,2
Received:
2020-03-30
Accepted:
2020-07-23
Online:
2021-02-25
Published:
2021-04-25
Contact:
ZHANG Yuan
E-mail:huanghp@radi.ac.cn;zhangyuan@radi.ac.cn
About author:
Huang Huiping (1973-), PhD and Professor, specialized in remote sensing for urban analysis. E-mail:Supported by:
HUANG Huiping, CHEN Wei, ZHANG Yuan, QIAO Lin, DU Yunyan. Analysis of ecological quality in Lhasa Metropolitan Area during 1990-2017 based on remote sensing and Google Earth Engine platform[J].Journal of Geographical Sciences, 2021, 31(2): 265-280.
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Table 1
Principal component eigenvectors, eigenvalues, contribution rate and cumulative contribution"
Year | 2005 | 2017 | ||||||
---|---|---|---|---|---|---|---|---|
PC1 | PC2 | PC3 | PC4 | PC1 | PC2 | PC3 | PC4 | |
NDVI | 0.130 | 0.964 | 0.178 | -0.145 | 0.012 | -0.076 | 0.923 | 0.376 |
Wet | 0.195 | 0.021 | -0.762 | -0.617 | 0.329 | -0.921 | -0.143 | 0.154 |
LST | -0.139 | -0.205 | 0.584 | -0.773 | -0.027 | 0.199 | -0.355 | 0.913 |
Dry | -0.962 | 0.165 | -0.215 | -0.033 | -0.944 | -0.327 | -0.028 | 0.033 |
Eigenvalue, | 0.0112 | 0.0050 | 0.0012 | 0.0002 | 0.0113 | 0.0050 | 0.0009 | 0.0001 |
Contribution rate | 63.63% | 28.48% | 6.82% | 1.07% | 51.24% | 32.09% | 15.05% | 1.62% |
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