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NASA historic Earth images still hold research value

Date:
March 19, 2014
Source:
NASA/Jet Propulsion Laboratory
Summary:
NASA's Seasat satellite became history long ago, but it left a legacy of images of Earth's ocean, volcanoes, forests and other features that were made by the first synthetic aperture radar ever mounted on a satellite. Potential research uses for the recently released 35-year-old images are outlined in a new paper.

This Seasat synthetic aperture radar image from Aug. 27, 1978, shows the Massachusetts coast from Nantucket Island in the south past Cape Cod and Boston to Cape Ann in the north.
Credit: Alaska Satellite Facility

NASA's Seasat satellite became history long ago, but it left a legacy of images of Earth's ocean, volcanoes, forests and other features that were made by the first synthetic aperture radar ever mounted on a satellite. Potential research uses for the recently released 35-year-old images are outlined in a paper published in the journal Eos today, March 18.

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Seasat, which was managed by NASA's Jet Propulsion Laboratory in Pasadena, Calif., was the first satellite mission designed specifically to observe the ocean. Launched in 1978, it suffered a mission-ending power failure after 105 days of operation. But in that short time, Seasat collected more information about the ocean than had been acquired in the previous hundred years of shipboard research, said Benjamin Holt, a research scientist at JPL and coauthor of the Eos paper. The complete catalog of Seasat images has been processed digitally and is freely available from the Alaska Satellite Facility.

To access the Seasat images, visit: https://www.asf.alaska.edu/seasat/ .

"There's still unique oceanographic data in these products that haven't been duplicated by more recent missions," said Holt. "We see different things in the Seasat images of the ocean currents than are seen by other satellites carrying synthetic aperture radar." This technology allows researchers to create very high-resolution images using complex information-processing techniques.

The 1978 data set also has value for climate studies of land cover simply because of its age. Holt noted that the images of Alaskan, Canadian and Norwegian glaciers are much earlier than any other satellite images that are currently available. This gives glaciologists an earlier baseline against which to measure the glaciers' rates of change.

NASA monitors Earth's vital signs from land, air and space with a fleet of satellites and ambitious airborne and ground-based observation campaigns. NASA develops new ways to observe and study Earth's interconnected natural systems with long-term data records and computer analysis tools to better see how our planet is changing. The agency shares this unique knowledge with the global community and works with institutions in the United States and around the world that contribute to understanding and protecting our home planet.

For more information about NASA's Earth science activities in 2014, visit: http://www.nasa.gov/earthrightnow .


Story Source:

The above story is based on materials provided by NASA/Jet Propulsion Laboratory. Note: Materials may be edited for content and length.


Journal Reference:

  1. Tom Logan, Ben Holt, Lisa Drew. The Newest Oldest Data From Seasat's Synthetic Aperture Radar. Eos, Transactions American Geophysical Union, 2014; 95 (11): 93 DOI: 10.1002/2014EO110001

Cite This Page:

NASA/Jet Propulsion Laboratory. "NASA historic Earth images still hold research value." ScienceDaily. ScienceDaily, 19 March 2014. <www.sciencedaily.com/releases/2014/03/140319090730.htm>.
NASA/Jet Propulsion Laboratory. (2014, March 19). NASA historic Earth images still hold research value. ScienceDaily. Retrieved December 22, 2014 from www.sciencedaily.com/releases/2014/03/140319090730.htm
NASA/Jet Propulsion Laboratory. "NASA historic Earth images still hold research value." ScienceDaily. www.sciencedaily.com/releases/2014/03/140319090730.htm (accessed December 22, 2014).

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