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Satellite Mission Overviews

Satellite mission overviews provide essential information about the design, purpose, and operation of satellites used for various applications, including remote sensing, communications, and navigation. For example, geostationary satellites orbit Earth at an altitude of 35,786 km, matching Earth's rotation so they appear stationary in the sky. This makes them ideal for weather monitoring, telecommunications, and navigation. Other satellites, like those in the Landsat program, provide detailed images of Earth's surface for environmental monitoring, agriculture, and urban planning. Understanding these missions is crucial for leveraging satellite data to address global challenges such as climate change, resource management, and disaster response.

Figures (10)

Landsat 7, launched in 1999, is the 7th of 9 satellites in the Landsat program.
Virginia Norwood, "The Mother of Landsat", designed the multispectral scanner.
The spectral band placement for each sensor of Landsat
One year after launch, Landsat 8 imagery had over one million file downloads by data users.
A false-color image of irrigated fields near Garden City, Kansas, taken by the Landsat 7 satellite
Landsat image of the Aral Sea in 2013
Landsat images of burned land in Yellowstone National Park in 1989 and 2011
Landsat-5 false color images of the Columbia Glacier, Alaska in 1986 and 2011
Landsat false color image highlighting developed areas in pink in Vancouver, British Columbia, Canada
Landsat 8/9 and Landsat Next spectral band comparison

Satellite mission overviews explain how satellites are designed, what they do, and how they work in space. They help scientists and engineers use satellite data for things like weather, farming, and navigation. For example, geostationary satellites stay in one spot above Earth, making them perfect for tracking storms or sending TV signals.

Other satellites, like those in the Landsat program, take detailed pictures of Earth’s surface to help monitor forests, water, and cities. These missions are important for solving big problems like climate change and managing natural resources. A key part of satellite missions is the orbit.

Other satellites, like those in low Earth orbit, move faster and cover more ground, but they pass over the same spot less often. Understanding these orbits helps scientists choose the right satellite for the job. Satellites use different types of sensors to collect data.

Some detect visible light, like the human eye sees, while others pick up infrared or microwave signals. This data helps track changes in Earth’s environment, like shrinking lakes or growing cities. Landsat satellites, for example, have been taking images since 1972, creating a long record of how Earth changes over time.

Satellite missions also involve careful planning. Satellites need to be launched into the right orbit, and they must avoid collisions with other satellites or space debris. When they reach the end of their life, they are often moved to a higher orbit to keep space safe.

These details are part of what makes satellite missions successful and useful for people around the world.

Key Points

  • Active sensors emit energy to scan objects and measure the radiation that is reflected or backscattered from the target.
  • Passive sensors gather radiation that is emitted or reflected by the object or surrounding areas.
  • Laser and radar altimeters on satellites have provided a wide range of data, including mapping features on the seafloor and measuring wind speeds and surface ocean currents.

Terms

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