Table 4.

The most commonly measured qualitative parameters of water by means of remote sensing.

Water Quality Parameter	Abbreviation	Units	Optical Activity	References
chlorophyll-a	CHL-a	mg/L	Active	[10,36,37,38]
Secchi Disk Depth	SDD	m	Active	[39,40,41,42]
Temperature	T	°C	Active	[43,44,45,46]
Colored Dissolved Organic Matters	CDOM	mg/L	Active	[10,47,48,49]
Total Organic Carbon	TOC	mg/L	Active	[50,51,52]
Dissolved Organic Carbon	DOC	mg/L	Inactive	[53,54,55]
Total Suspended Matters	TSM	mg/L	Active	[56,57,58,59]
Turbidity	TUR	NTU	Active	[60,61,62]
Sea Surface Salinity	SSS	PSU	Active	[63,64,65,66]
Total Phosphorus	TP	mg/L	Inactive	[29,36,67,68,69]
Ortho-Phosphate	PO4	mg/L	Inactive	[70]
Chemical Oxygen Demand (COD)	COD	mg/L	Inactive	[71,72,73,74]
Biochemical Oxygen Demand	BOD	mg/L	Inactive	[62,75,76,77]
Electrical Conductivity	EC	µs/cm	Active	[78,79,80]
Ammonia Nitrogen	NH3-N	mg/L	Inactive	[73,81,82]