IRS P4 (Indian Remote Sensor P4), also known as Oceansat 1, was an remote sensing satellite that was placed into a Sun-synchronous orbit. The satellite carried an OCM (Ocean Color Monitor) and a MSMR (Multi-frequency Scanning Microwave Radiometer) instrument. OCM will monitor globally potential fishery zones, ocean currents, and pollution and sediment inputs in the coastal zones. It operates on eight wavelength bands, providing data with a swath width of 1,420 km and at a resolution of 350 meters. MSMR will monitor at 6.6 GHz sea surface temperature, wind speed, cloud vapor/water content.
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