Online Courses (English)
This just in:

State PCS

Daily Updates

Science & Technology

Landsat 9

Star marking (1-5) indicates the importance of topic for CSE
  • 29 Sep 2021
  • 4 min read

Why in News

Recently, NASA has launched an earth monitoring satellite called Landsat 9 from Vandenberg Space Force Base in California. The satellite is a joint mission of NASA and the US Geological Survey (USGS).

  • This satellite is referred to as NASA's' new eye in the sky’ that will help study climate change.

Key Points

  • Background:
    • Landsat-9 is the continuation of a series of Earth-observing spacecraft stretching back almost 50 years.
    • The first Landsat satellite was launched in 1972 and since then, Landsat satellites have collected images of earth and helped understand how land usage has changed over the decades.
    • In 2008, it was decided that all Landsat images will be free and publicly available and the policy has helped scores of researchers, farmers, policy analysts, glaciologists, and seismologists.
    • Landsat images have been used to study the health of forests, coral reefs, monitor water quality and melting glaciers.
  • About Landsat 9:
    • The Landsat 9 joins Landsat 8 that was launched in 2013 and the satellites together will collect images of Earth’s surface.
      • It takes 8 days to capture the whole Earth.
    • Landsat 9 carries instruments similar to the other Landsat satellites, but it is the most technologically advanced satellite of its generation.
    • The instruments aboard Landsat 9 are the Operational Land Imager 2 (OLI-2) and the Thermal Infrared Sensor 2 (TIRS-2).
      • OLI-2: It captures sunlight reflected off Earth’s surface and studies the visible, near-infrared, and short wave infrared portions of the spectrum.
      • TIRS-2: It has a four-element refractive telescope and photosensitive detectors that capture thermal radiation and help study the Earth’s surface temperature.
    • Along with the European Union’s Sentinel-2 satellites, the Landsat Satellite will provide better estimation of the extent of climate change.

Sentinel Satellites

  • It is a family of satellites developed by the European Space Agency (ESA) under the Copernicus Programme.
  • The Copernicus Programme is the Earth Observation Programme managed by the ESA, launched in 1998.
    • It was named after the scientist and observer Nicolaus Copernicus. Copernicus' theory of the heliocentric (sun-centric) universe made a pioneering contribution to modern science.
  • Sentinel satellites is a group of six satellites dedicated for different purposes.
    • Sentinel 1: It provides all-weather, day and night radar images.
    • Sentinel 2: It delivers high-resolution optical images for land services.
    • Sentinel 3: It delivers data on land and ocean.
    • Sentinel 4 and 5: Monitor atmosphere from geostationary and polar orbits.
    • Sentinel 6: Provides information on oceanography and climate studies.

Earth Observation Satellites of India

  • Recently, India has launched EOS-01 satellite.
    • It is an earth observation satellite and is intended for applications in agriculture, forestry and disaster management support.
  • Earth observation satellites are the satellites equipped with remote sensing technology. Earth observation is the gathering of information about Earth's physical, chemical and biological systems.
  • Other earth observation satellites launched by ISRO include RESOURCESAT- 2, 2A, CARTOSAT-1, 2, 2A, 2B, RISAT-1 and 2, OCEANSAT-2, Megha-Tropiques, SARAL and SCATSAT-1, INSAT-3DR, 3D, etc.

Source: IE

SMS Alerts

Please login or register to view note list


Please login or register to list article as bookmarked


Please login or register to make your note


Please login or register to list article as progressed


Please login or register to list article as bookmarked