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Proceedings Paper

Evaluation of the clouds and the Earth's radiant energy system (CERES) scanner pointing accuracy using a coastline detection system
Author(s): Jon Chris Currey; G. Louis Smith; Bob Neely
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Paper Abstract

Clouds and the Earth's Radiant Energy System (CERES) is a NASA investigation to examine the role of clouds in the radiative energy flow through the Earth-atmosphere system. The first CERES scanning radiometer was launched on November 27, 1997 into a 35 degree inclination, 350 km altitude orbit, on the Tropical Rainfall Measuring Mission (TRMM) spacecraft. The CERES instrument consists of a three channel scanning broadband radiometer. The spectral bands measure shortwave, window and total radiation reflected or emitted from the Earth-atmosphere system. Each Earth viewing measurement is geolocated to the Earth fixed coordinate system using satellite ephemeris, Earth rotation and geoid, and instrument pointing data. The interactive CERES coastline detection system is used to assess the accuracy of the CERES geolocation process. By analyzing radiative flux gradients at the boundaries of ocean and land masses, the accuracy of the scanner measurement locations may be derived for the CERES/TRMM instrument/satellite system. The resulting CERES measurement location errors are within 10 percent of the nadir footprint size. Precise pointing knowledge of the Visible and IR scanner is required for convolution of cloud properties onto the CERES footprint; initial VIRS coastline results are included.

Paper Details

Date Published: 3 October 1998
PDF: 10 pages
Proc. SPIE 3439, Earth Observing Systems III, (3 October 1998); doi: 10.1117/12.325642
Show Author Affiliations
Jon Chris Currey, NASA Langley Research Ctr. (United States)
G. Louis Smith, NASA Langley Research Ctr. (United States)
Bob Neely, Science Applications International Corp. (United States)

Published in SPIE Proceedings Vol. 3439:
Earth Observing Systems III
William L. Barnes, Editor(s)

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