About: Earth observation satellites
- Earth observation satellites are used for land and forest mapping and monitoring, mapping of resources like water or minerals or fishes, weather and climate observations, soil assessment and geospatial contour mapping.
- Data from Earth-observation satellites are in great demand, both from government agencies, which need it for planning and infrastructure development, as well as private companies looking to execute infrastructure and other projects.
- The EOS-01, is an earth observation satellite intended for applications in agriculture, forestry and disaster management support.
- EOS-01 is a Radar Imaging Satellite (RISAT), which was originally named RISAT-2BR2. It will work together with RISAT-2B and RISAT-2BR1 launched last year. Radar imaging satellites are a type of earth observation satellites.
New naming system for earth observation satellites:
- With EOS-01, ISRO is moving to a new naming system for its earth observation satellites which till now have been named thematically, according to the purpose they are meant for.
- For example, the Cartosat series of satellites were meant to provide data for land topography and mapping, while the Oceansat satellites were meant for observations over sea.
- Some INSAT-series, Resourcesat series, GISAT, Scatsat, and some more are all earth observation satellites, named differently for the jobs they are assigned to do, or the different instruments that they use to do their jobs.
About: Radar imaging
- Radar is a detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, weather and terrain (land).
- An advantage of radar imaging is that it is not affected by weather, cloud or fog, or the lack of sunlight. It can produce high-quality images in all conditions and at all times.
- Depending on the wavelength of the electromagnetic radiation used by the radar, different properties on land can be captured in the image.
- For example, a low wavelength signal can capture tree cover or vegetation, while a higher wavelength signal can penetrate even dense tree cover to look at land under the tree cover.