Research on Ecoenvironmental Quality Evaluation System Based on Big Data Analysis

Table 4

Principal component analysis results of indexes in 2019.

Index	2019
	PC1	PC2	PC3	PC4
Wet	0.160	0.012	0.719	0.676
NDVI	0.663	0.537	−0.432	0.293
NDSI	−0.464	−0.221	−0.528	0.676
LST	−0.565	0.814	0.131	−0.020
characteristic value	0.013	0.004	0.001	0.000
Eigenvalue contribution rate	75.05	20.36	4.31	0.28