MERSI - Medium Resolution Spectral Imager

MERSI is a scanner carried aboard the third FengYun ("Wind and Cloud") series of meteorological satellites launched by China.

FY-3A, launched June 2008, operates from a sunsynchronous polar-orbit at an average altitude of 836.4km. At this orbit FY-3A crosses overhead at about 10:10 a.m. local time everyday.

FY-3A carries a version of MERSI which images 20 spectral bands:

Channel	Wavelength (um)	Primary Use
1	0.445-0.495	250m
2	0.525-0.575	250m
3	0.625-0.675	250m
4	0.84-0.89	250m
5	10.25-12.75	250m
6	0.402-0.422	1000m
7	0.433-0.453	1000m
8	0.48-0.5	1000m
9	0.51-0.53	1000m
10	0.555-0.575	1000m
11	0.64-0.66	1000m
12	0.675-0.695	1000m
13	0.755-0.775	1000m
14	0.855-0.875	1000m
15	0.895-0.915	1000m
16	0.93-0.95	1000m
17	0.97-0.99	1000m
18	1.02-1.04	1000m
19	1.615-1.665	1000m
20	2.105-2.155	1000m