FY-4

Operator: China Meteorological Administration

Type of orbit: Geostationary

Instrument: AGRI (Advanced Geostationary Radiation Imager)

Number of spectral bands: 14

Resolution at the subsatellite point: VIS/NIR: 0.5~1km, IR: 2~4km

Pictures are taken at 15 minutes intervals.

The radiometer scans the earth's surface line by line; each line consists of a series of individual image elements or pixels. For each pixel the radiometer measures the radiative energy of the different spectral bands. This measurement is digitally coded and transmitted to the ground station for pre-processing before being disseminated to the user community.