Medium Resolution Spectral Imager-I (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%

Data and Products

Satellite Instrument Datasets
FY-3C MERSI-I L1 dataL2L3 product
FY-3B MERSI-I L1 dataL2L3 product
FY-3A MERSI-I L1 dataL2L3 product

Calibration and Validation

MERSI-I calibration and validation

FY-3C MERSI-I SRF (RAR)

FY-3B MERSI-I SRF (RAR)

FY-3A MERSI-I SRF (RAR)

MERSI-I

MERSI-I