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Proceedings Paper

Airborne ground illuminator for hyperspectral validation and calibration
Author(s): James E. Kalshoven
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Paper Abstract

A major difficulty in accurately quantifying various of the Earth's geophysical and biophysical features from the multi- spectral reflectance data acquired from space is the lack of extensive and reliable validation measurements from good ground truth. A new, active airborne sensor system, AVIS (airborne vegetation index sensor), addresses that problem. AVIS uses a flash lamp mounted on a NASA helicopter to illuminate the Earth with a 15 by 35 mrad spot. The visible and near-IR backscattered radiation is then received hyperspectrally and can be analyzed. Initially designed for validation of theories on vegetation index determination, AVIS has broad application as a simulator for solar illumination for remote surface analysis. Its primary advantage is the reduction or elimination of atmospheric scattering and solar angle effects, and the removal of shadowing. It also provides repeatability for time analysis over the same sites.

Paper Details

Date Published: 11 November 1996
PDF: 5 pages
Proc. SPIE 2820, Earth Observing System, (11 November 1996); doi: 10.1117/12.258116
Show Author Affiliations
James E. Kalshoven, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 2820:
Earth Observing System
William L. Barnes, Editor(s)

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