Table 1.

Parameters of the various NTL satellites.

Parameter	Satellite
	DMSP/OLS	NPP/VIIRS	LJ1-01
Orbit height	850 km	827 km	645 km
Regression cycle	12 h	12 h	3–5 days
Spectral range	500–900 nm	500-900 nm	460–980 nm
Quantization bits	6	14	15
Spatial Resolution	2.7 km	740 m	130 m
Swath	3000 km	3000 km	264k m
On-board calibration	No	Yes	Yes
Nighttime overpass	~19:30	~1:30	~22:30
Available Period	1992–2013	November 2011–present	June 2018–present