Spatially explicit assessment of heat health risk by using multi-sensor remote sensing images and socioeconomic data in Yangtze River Delta, China

Table 2 Principle component analysis result of social vulnerability

Components	Eigenvalue	Percentage variance explained	Variables	Loadings
(1) Socioeconomic status	2.667	48.24	Air conditioners per 100 household	0.818
			Per capita GDP (RMB Yuan)	0.801
			Illiteracy or semi-illiteracy rates of population (≥ 15 years)	− 0.715
			Percentage of the elderly (≥ 60 years) living alone	− 0.649
			Total beds of health institutions	0.641
(2) Age	1.018	17.12	Percentage of population over 65 years old	− 0.769

ISSN: 1476-072X