Research on Ecoenvironmental Quality Evaluation System Based on Big Data Analysis

Table 2

Principal component analysis results of indexes in 2013 and 2018.

Index	2013				2018
	PC1	PC2	PC3	PC4	PC1	PC2	PC3	PC4
Wet	0.2011	0.031	0.714	0.670	0.183	0.008	0.695	0.696
NDVI	0.607	0.584	−0.460	0.281	0,680	0.492	−0.466	0.282
NDSI	−0.457	−0.252	−0.505	0.687	−0,499	−0.190	−0.528	0.660
LST	−0.618	0.771	0.154	−0.015	−0.506	0.850	0.145	−0.022
Characteristic value	0.012	0.004	0.001	0.000	0.012	0.003	0.001	0.000
Eigenvalue contribution rate	73.47	21.44	4.74	0.35	77.47	17.53	4.64	0.36