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Proceedings Paper

Three-dimensional modeling of agricultural canopies for thermal IR exitance studies
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Paper Abstract

We present a simple, three-dimensional vegetation canopy thermal infrared exitance model for agricultural scenes. Computer graphics and ray-tracing techniques are used to estimate three-dimensional canopy view factors and scene shadows. The view factors are used to weight the individual contributions of soil and vegetation emission computed by steady-state energy budget formulations. We compare the three- dimensional model results to a one-dimensional formulation for an agricultural test site from the Hydrologic Atmospheric Pilot Experiment and Modelisation du Bilan Hydrique. The root mean square error is daylight brightness temperature for the one dimensional model was 2.5 degrees Celsius and 2.0 degrees Celsius for the three dimensional model.

Paper Details

Date Published: 30 December 1997
PDF: 8 pages
Proc. SPIE 3222, Earth Surface Remote Sensing, (30 December 1997); doi: 10.1117/12.298184
Show Author Affiliations
James Alan Smith, NASA Goddard Space Flight Ctr. (United States)
Jeffrey A. Pedelty, NASA Goddard Space Flight Ctr. (United States)
Jerrell R. Ballard Jr., U.S. Army Engineer Waterways Experiment Station (United States)
Thomas J. Schmugge, USDA Agricultural Research Service (United States)

Published in SPIE Proceedings Vol. 3222:
Earth Surface Remote Sensing
Giovanna Cecchi; Edwin T. Engman; Eugenio Zilioli, Editor(s)

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