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Optical Engineering Article Reports JPL Design for Improved Landsat Images
  • USA - English


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SPIE

Jan 29, 2016, 19:50 ET

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JPL research in Optical Engineering on a new imaging spectrometer design to improve Landsat images. Above, Fig. 3: Spectrometer ray-trace in the spectral direction. doi:10.1117/1.OE.55.1.015104
JPL research in Optical Engineering on a new imaging spectrometer design to improve Landsat images. Above, Fig. 3: Spectrometer ray-trace in the spectral direction. doi:10.1117/1.OE.55.1.015104

BELLINGHAM, Washington, USA, and CARDIFF, UK (PRWEB) January 29, 2016 -- For more than 40 years, Landsat satellites have provided a wealth of data that has informed our understanding of Earth features, phenomena, and environments as diverse as coral reefs, urbanization, tropical deforestation, and glaciers. Now, scientists at the Jet Propulsion Lab (JPL) at the California Institute of Technology have reported in an SPIE journal that they have developed a way to substantially improve images derived from Landsat systems, to render even more useful information.

Even more important is the enhanced science potential that the full spectroscopic capability brings.

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Pantazis Mouroulis and colleagues at JPL describe in an article published this week in Optical Engineering the design of a high-throughput and high-uniformity pushbroom imaging spectrometer and telescope system that is capable providing Landsat swath and resolution with better than 10 nm per pixel spectral resolution over the full visible to short-wave infrared band. Optical Engineering is published by SPIE, the international society for optics and photonics,

The Landsat 8 satellite carries a thermal infrared sensor and an operational land imager (OLI). The OLI replaced a thematic mapper found in the previous Landsat generations, which used a scan mirror to cover the required wide swath. OLI instead utilizes long detector arrays in a pushbroom fashion, the authors note in “Landsat swath imaging spectrometer design.”

While the removal of the scan mirror is an advance in terms of signal to noise, reliability, and potential simplicity of design, the OLI design still suffers from registration concerns between bands owing to the nonsimultaneity of data collection.

An imaging spectrometer does not suffer that problem since it is capable of collecting all bands simultaneously.

Even more important is the enhanced science potential that the full spectroscopic capability brings, the authors note.

“However,” they write, “it has been generally difficult to find optical spectrometer and system solutions that satisfy the swath, resolution, spectral range, and signal to noise ratio of the heritage systems. We present in this paper a pushbroom imaging spectrometer design that can achieve these objectives.”

Journal associate editor Thomas Cooley, a senior scientist with the U.S. Air Force Research Lab, emphasized the significance of the report, noting that it demonstrates new capabilities in “what is technically possible with advances in a range of supporting technology domains.”

Co-authors with Mouroulis are Robert Green, Byron Van Gorp, Lori Moore, Daniel Wilson, and Holly Bender.

Michael Eismann, Chief Scientist, Sensors Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, is editor-in-chief of Optical Engineering. The journal is published in print and digitally in the SPIE Digital Library, which contains more than 430,000 articles from SPIE journals, proceedings, and books, with approximately 18,000 new research papers added each year.

About SPIE

SPIE is the international society for optics and photonics, an educational not-for-profit organization founded in 1955 to advance light-based science, engineering, and technology. The Society serves nearly 264,000 constituents from approximately 166 countries, offering conferences and their published proceedings, continuing education, books, journals, and the SPIE Digital Library. In 2015, SPIE provided more than $5.2 million in support of education and outreach programs. http://www.spie.org

Amy Nelson, Public Relations Manager, SPIE, http://spie.org, +1 (360) 685-5478, [email protected]

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