MERSI-I

Description

Spectral imaging instrument in the resolution to probe a system from the Earth's atmosphere, gets the electromagnetic radiation in the 20 channels in multi-spectral information. By imaging, you can implement vegetation, ecology, land cover classification and snow-covered global land surface characteristics.

This instrument has 20 channels on FY-3A/B/C satellites. The MERSI channels are mainly located in visible (VIS) and near-IR (NIR) spectral regions while the Visible and Infrared Radiometer (VIRR) instrument has the important IR channels. These two instruments complement each other. The IR bands from MERSI-I and VIRR can also be used together with the radiance measurements of the sounding instruments for handling clouds in atmospheric profiling.

MERSI-I has five channels (four VIS and one thermal IR) with a spatial resolution of 250 m, which enable imaging of the Earth with high resolution in natural color during the day and high-resolution thermal IR imaging during the night.

Example of remote sensing:

8-16 wave channel is high SNR narrow-band channel, can be realized by chlorophyll, suspended sediment and the concentration of soluble yellow substance inversion.
2.13 µm channel on the aerosol relatively transparent, combined with a visible channel, you can implement quantitative terrestrial aerosol.
remote sensing 0.94 Micron near-infrared moisture absorption of 3 channels, enhances atmospheric water vapor especially low-level moisture detectability.
250 m resolution visible light three-channel true color image, you can implement a variety of natural disasters and environmental impact monitoring, monitoring of image Mesoscale convective clouds and surface characteristics of fine.
spectral imager with high precision sensing cloud properties, aerosol, land surface, Ocean color, such as the lower water vapor, implements the geophysical elements to air, land and sea of multi-spectral continuous comprehensive observation.

Characteristics

Satellite	FY-3A , FY-3B , FY-3C
No. Channels	20 (19 narrow-band VIS/NIR/SWIR, 1 broadband IR)
Spatial Resolution	250m (8192 probes) / 1000m (2048 probes)
Weight	117kg
Power	125W

Characteristics

Channel	Central wavelength (µm)	Spectral bandwidth (µm)	Spatial Resolution (m)	Noise equivalent reflectivity ρ(%) / temperature difference (300K)	Dynamic range (max reflectivity ρ / maximum temperature K)
1	0.470	0.05	250	0.45	100%
2	0.550	0.05	250	0.4	100%
3	0.650	0.05	250	0.3	100%
4	0.865	0.05	250	0.3	100%
5	11.25	2.5	250	0.4 K	330k
6	0.412	0.02	1000	0.1	80%
7	0.443	0.02	1000	0.1	80%
8	0.490	0.02	1000	0.05	80%
9	0.520	0.02	1000	0.05	80%
10	0.565	0.02	1000	0.05	80%
11	0.650	0.02	1000	0.05	80%
12	0.685	0.02	1000	0.05	80%
13	0.765	0.02	1000	0.05	80%
14	0.865	0.02	1000	0.05	80%
15	0.905	0.02	1000	0.10	90%
16	0.940	0.02	1000	0.10	90%
17	0.980	0.02	1000	0.10	90%
18	1.030	0.02	1000	0.10	90%
19	1.640	0.05	1000	0.05	90%
20	2.130	0.05	1000	0.05	90%