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Proceedings Paper

PARABOLA II: a field sphere-scanning radiometer for radiance measurements of sky and ground
Author(s): Paul H. Stockton; Donald W. Deering
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Paper Abstract

Bi-directional reflectance from earth terrain surfaces, particularly vegetation has placed increasing emphasis on the measurement of angular reflectance. Many remote-sensing scientists today are focusing on measurements and/or modeling of the angular reflectance properties of earth surface materials. The angular studies emphasis is occurring for several reasons. Of the four primary aspects of land surface reflectance (i.e., spectral, spatial, temporal, angular), this is the least intensively studied and, therefore, the least understood. The angular reflectance properties of Earth targets and, in particular, the bi-directional reflectance of land surface cover types, must be studied to develop algorithms to provide more accurate estimates of spectral hemispherical reflectance and albedo, which is a crucial input to Global Climate Models. The maximum potential of current satellites (e.g., SPOT, AVHRR) that acquire off-nadir viewing data cannot be realized without a good understanding of the angular reflectance properties of the Earth's surfaces. Future EOS satellite instruments (e.g., MISR) have been included expressly to take advantage of, or, to help overcome, the Earth's surface and atmosphere angular reflectance dependencies. The PARABOLA II field scanning radiometer will aid in ground calibration.

Paper Details

Date Published: 4 October 1994
PDF: 8 pages
Proc. SPIE 2270, NASA/SPIE Conference on Spin-Off Technologies from NASA for Commercial Sensors and Scientific Applications, (4 October 1994); doi: 10.1117/12.188819
Show Author Affiliations
Paul H. Stockton, Sensit Technologies, Inc. (United States)
Donald W. Deering, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 2270:
NASA/SPIE Conference on Spin-Off Technologies from NASA for Commercial Sensors and Scientific Applications
Nona K. Minnifield, Editor(s)

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