Spatial Differentiation Analysis of Water Quality in Dianchi Lake Based on GF-5 NDVI Characteristic Optimization

Table 3

Characteristic bands of Caohai and Waihai in the near-infrared band.

Area	Band	Reflectance value (%)	Band characteristics
Caohai	B99 (810 nm)	0.85	Reflection peak 1
	B151 (1005 nm)	1.84	Reflection peak 2, max
	B203 (1444 nm)	0.98	Reflection peak 3
	B264 (1957 nm)	0.66	Reflection peak 4
	B271 (2016 nm)	0.52	Reflection peak 5
	B129 (938 nm)	0.25	Absorption valley 1
	B166 (1131 nm)	0.50	Absorption valley 2
	B206 (1469 nm)	0.34	Absorption valley 3
	B268 (1991 nm)	0.17	Absorption valley 4
	B285 (2134 nm)	0.11	Absorption valley 5, min
		0.45	Mean
Waihai	B99 (810 nm)	1.24	Reflection peak 1, max
	B151 (1005 nm)	0.79	Reflection peak 2
	B203 (1444 nm)	0.39	Reflection peak 3
	B264 (1957 nm)	0.70	Reflection peak 4
	B271 (2016 nm)	0.75	Reflection peak 5
	B129 (938 nm)	0.15	Absorption valley 1
	B166 (1131 nm)	0.08	Absorption valley 2, min
	B206 (1469 nm)	0.08	Absorption valley 3
	B268 (1991 nm)	0.29	Absorption valley 4
	B285 (2134 nm)	0.26	Absorption valley 5
		0.42	Mean