A Remote-Sensing Ecological Index Approach for Restoration Assessment of Rare-Earth Elements Mining

Table 1

Remote sensing ecological index calculation equation based on Landsat.

Year	Indicator	PC1	PC2	PC3	PC4
2013	NDVI	0.582089	0.574744	−0.39636	0.416822
	WET	0.455065	-0.451275	0.562854	0.521979
	NDBSI	−0.656506	0.039045	−0.126583	0.742599
	LST	−0.15195	0.681539	0.714192	−0.048427
	Eigenvalues	0.1271	0.0196	0.0074	0.0008
	Eigenvalue contribution rate	82.04%	12.64%	4.90%	0.52%
2016	NDVI	0.438591	0.403537	−0.625649	0.503348
	WET	0.33248	−0.212784	0.632208	0.666703
	NDBSI	−0.804157	−0.11432	−0.195237	0.549677
	LST	−0.224557	0.882503	0.41323	0.001794
	Eigenvalues	0.0899	0.0116	0.004	0.0006
	Eigenvalue contribution rate	84.69%	10.92%	3.78%	0.61%
2019	NDVI	0.600385	0.628438	−0.286336	0.403256
	WET	0.371651	−0.501933	0.51029	0.591222
	NDBSI	−0.66054	0.060444	−0.268693	0.698454
	LST	−0.255148	0.591165	0.765127	0.001885
	Eigenvalues	0.641	0.0076	0.0034	0.0004
	Eigenvalue contribution rate	84.91%	10.01%	4.51%	0.57%