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Proceedings Paper

Geometric retrieval of cloud top height from MISR imagery
Author(s): Jia Zong
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Paper Abstract

The multi-stage imaging spectroradiometer (MISR) instrument, a part of NASA's the Earth Observing System (EOS), is to be launched in 1999 aboard the EOS AM-1 satellite. The MISR instrument consists of nine pushbroom cameras pointing at discrete view angles. Multi-angle imagery form MISR creates opportunities to retrieve new scientific parameters relating to the earth's aerosols, clouds, and surface. This paper focuses on the accurate geometric retrieval of cloud top height from MISR data. It consists of three major processing steps. The first process projects and registers multi-angle MISR radiance imagery to an ellipsoidal earth surface represented by the WGS-84 ellipsoid. The results of this processing provides not only surface registration but also near epipolar imaging geometry. The next processing step separates the cloud motion and cloud height. Traditionally, this has been considered a singular problem in photogrammetry even with stereo imagery. However, a separation condition does exist with satellite imaging and multiple MISR camera look-angles. The last processing step automatically retrieves cloud-top height field in high resolution from ellipsoid-projected MISR radiance imagery. This paper present the above three processing steps starting from an accurate and efficient projection of multi-angle MISR image data to the ellipsoid surface, followed by a mathematical derivation which separates the cloud motion and height, and finally an automatic image matching and ray intersection algorithm for high resolution cloud top height retrieval.

Paper Details

Date Published: 18 August 1998
PDF: 11 pages
Proc. SPIE 3501, Optical Remote Sensing of the Atmosphere and Clouds, (18 August 1998); doi: 10.1117/12.317757
Show Author Affiliations
Jia Zong, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 3501:
Optical Remote Sensing of the Atmosphere and Clouds
Jinxue Wang; Beiying Wu; Toshihiro Ogawa; Zheng-hua Guan, Editor(s)

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