Estimation of Reservoir Bio-Optical Water Quality Parameters Using Smartphone Sensor Apps and Landsat ETM+: Review and Comparative Experimental Results

Table 9

Summary of colour measurements using laboratory spectrophotometry, EyeOnWater, and HydroColor apps.

Sampling station	1	2	3	4	5	6	7	8	9	10	11	12
Laboratory wavelength (nm)	550	570	550	500	570	500	500	570	500	530	580	550
Laboratory colour hue	Greenish-yellow	Greenish-yellow	Greenish-yellow	Green	Greenish-yellow	Green	Green	Greenish-yellow	Green	Green	Yellow	Greenish-yellow
EyeOnWater FU values	12	13	10	8	11	15	8	13	14	9	11	9
EyeOnWater wavelength (nm)	550	570	550	500	570	500	500	570	500	530	590	550
EyeOnWater colour hue	Greenish	Greenish	Greenish	Greenish-blue	Greenish	Greenish-brown	Greenish-blue	Greenish	Brownish-green	Bluish- green	Greenish	Greenish- blue
HydroColor wavelength (nm)	553	513	553	553	553	490	609	553	553	553	513	513
HydroColor colour hue	Greenish-brown	Greenish	Greenish-brown	Greenish-brown	Greenish-brown	Greenish-blue	Orange-green	Greenish- brown	Greenish-brown	Greenish-brown	Greenish	Greenish