Research on Ecoenvironmental Quality Evaluation System Based on Big Data Analysis

Table 1

Principal component analysis results of indexes in 2004 and 2010.

Index	2004				2010
	PC1	PC2	PC3	PC4	PC1	PC2	PC3	PC4
Wet	0.237	−0.022	0.769	0.593	0.227	0.106	0.832	0.495
NDVI	0.632	0.456	−0.486	0.395	0.534	0.567	−0.467	0.420
NDSI	−0.563	−0.225	−0.373	0.702	−0.451	−0.408	−0,287	0.761
LST	−0.476	0.861	0.179	−0.010	−0.701	0.708	0.083	0.029
Characteristic value	0.017	0.003	0.001	0.000	0.011	0.003	0.001	0.000
Eigenvalue contribution rate	78.91	15.17	5.21	0.71	71.06	21.80	6.44	0.70