Table 8 The brightness of object categories (ground, building, water, Sky, plants) of individual images for each studied site (DGGD, GMS, GZGD, YZJGD, YHSW) (summer).

Study site	Brightness	Ground	Building	Water	Sky	Plant
Site1(DGGD)	Very Low Brightness	——	——	——	——	——
	Low Brightness	——	8.36 ± 1.17	52.67 ± 1.56	40.63 ± 0。90	6.93 ± 0.64
	Medium Brightness	——	91.58 ± 1.18	47.25 ± 1.62	4.68 ± 2.49	92.98 ± 0.64
	High Brightness	——	——	——	54.63 ± 1.65	——
Site2(GMS)	Very Low brightness	——	——	37.48 ± 3.54	——	——
	Low Brightness	——	56.01 ± 0.46	17.64 ± 4.16	36.68 ± 0.52	8.75 ± 1.20
	Medium Brightness	——	44.08 ± 0.30	44.76 ± 0.74	——	91.14 ± 1.23
	High Brightness	——	——	——	63.3 ± 0.54	——
Site3(GZGD)	Very Low Brightness	——	——	——	——	——
	Low Brightness	——	9.30 ± 1.37	53.90 ± 1.45	0.24 ± 0.11	57.98 ± 2.63
	Medium Brightness	——	90.65 ± 1.33	46.89 ± 2.91	49.01 ± 3.80	41.87 ± 2.54
	High Brightness	——	——	——	50.64 ± 3.87	——
Site4(YHSW)	Very Low Brightness	——	——	——	——	——
	Low Brightness	——	0.41 ± 0.30	42.97 ± 22.71	——	87.18 ± 3.03
	Medium Brightness	——	49.84 ± 0.23	58.41 ± 0.41	——	8.96 ± 4.50
	High Brightness	——	49.58 ± 0.13	——	99.85 ± 0.02	——
Site5(YZJGD)	Very Low Brightness	——	——	——	——	8.26 ± 8.26
	Low Brightness	——	3.89 ± 0.66	38.03 ± 0.70	0.25 ± 0.11	80.01 ± 12.13
	Medium Bbrightness	——	48.42 ± 0.05	61.92 ± 0.72	——	1.23 ± 1.23
	High Brightness	——	47.47 ± 0.50	——	99.67 ± 0.17	——

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