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LATEST FEATURED IMAGE FROM ASTER:




Poniente Almeriense, Spain
Poniente Almeriense in Almeria, Spain is also known as the Sea of Plastic due to
the multitude of greenhouses that cover the area. Read More. Updated on
2/23/2023



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January 19, 2023

Terra Constellation Exit



In April 2022, Terra began drifting to an earlier crossing time, reaching 10:15
am in October. In mid-October, Terra lowered its orbit by 6 km. After
"constellation exit" ASTER science observations are continuing as before.
Science observations will continue in concert with the changing MLT. The major
effect will be that the ASTER surface sampling pattern will no longer be
repeating every 16 days. However, sample locations will be reported with the
data in the same format as current data. The ASTER single pixel footprint size
will decrease about 1% with the lower orbit altitude, but will be maintained at
15m and 90m through re-sampling. We do not expect these orbit changes to have
significant impacts to ASTER data quality.

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The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is an
imaging instrument onboard Terra, the flagship satellite of NASA's Earth
Observing System (EOS) launched in December 1999. ASTER is a cooperative effort
between NASA, Japan's Ministry of Economy, Trade and Industry (METI), and Japan
Space Systems (J-spacesystems). ASTER data are used to create detailed maps of
land surface temperature, reflectance, and elevation. The coordinated system of
EOS satellites, including Terra, is a major component of NASA's Science Mission
Directorate and the Earth Science Division. The goal of NASA Earth Science is to
develop a scientific understanding of the Earth as an integrated system, its
response to change, and to better predict variability and trends in climate,
weather, and natural hazards.





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