RISAT series
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- Radar imaging satellite series with resolution less than 1 m
- Active remote sensing satellite: beam a radio signal on the earth’s surface and ‘senses’ the radio signal reflected back giving them all-weather and day-and-night observing capability.
- ISRO has launched 7 satellites in the RISAT series so far. Risat-2A is yet to be launched.
- Applications: Agriculture, forestry, soil moisture, geology, sea ice, coastal monitoring, object identification, flood monitoring and military surveillance.
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CARTOSAT series
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- Remote sensing satellite dedicated to cartographic applications.
- Earlier versions were panchromatic (senses visible light across all colours, violet to red). Cartosat-2C onwards multi-spectral scanners are used and Cartosat 3 has a hyperspectral scanner.
- General applications: Cartography for large scale urban planning, rural resource and infrastructure development, Land Information System and GIS application, coastal land use etc.
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ResourceSat series
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- Natural resource monitoring satellites
- Medium resolution, wide swath satellites with multispectral scanners
- Applications: Advanced land and water resource management applications.
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OceanSAT series
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- Dedicated EO satellite for ocean monitoring.
- Multispectral microwave sensor to measure sea surface temperature, wind speed, cloud water content and water vapour content in the atmosphere above the ocean.
- Application: Study of chlorophyll concentration, phytoplankton blooms, atmospheric aerosols and suspended sediments in the water.
- Includes OceanSAT 1, 2, and 3 and 3A.
- OceanSAT 3(named EOS-06) was launched in November 2022.
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GiSat series: Geo-imaging satellites
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- 1st among remote-sensing satellite in geosynchronous orbit. (normally they are in SSPO)
Status
- GiSat-1(EOS-03) launch in 2021 failed
- GiSat-2(EOS-05) is a dedicated military satellite to be acquired by Indian Navy. Launch date to be decided.
Significance
- Currently imaging satellites map a particular area only once in 22 days. GiSat can scan or map an area every 2nd day as it will be placed in geostationary orbit.
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