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Proceedings Paper

High temporal and spatial thermal infrared characterization of dense grass during high-humidity conditions
Author(s): Jerrell R. Ballard; Thomas E. Berry; David L. Leese; Stacy C. Anderson; Laura S. Bunch
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Paper Abstract

This paper describes the high temporal (1 sec to 5 min) and spatial thermal infrared directional characterization of low dense grass canopy during high humidity conditions to study the diurnal and spatial variation of simple vegetation background signatures. The instruments used in the characterization effort consisted of two infrared cameras (8-14 μm) set at nadir and 45 degrees, four sets of radiometers (3-5 μm and 8-12 μm), micrometeorological instruments, and thermocouples placed within the grass. Micrometeorological measurements included wind speed, air temperature, and relative humidity observed at several heights above the canopy sampling occurred at 1 sec and 5 min intervals. These measurements were used to calculate wind speed, air temperature, and relative humidity profiles down to the top of the grass canopy. Analysis of the measured thermal images consists of quantifying the diurnal thermal differences in the directional background signatures, directional thermal variance, and thermal variance differences related to observation angle, solar radiation, and wind speed. These preliminary analyses indicate that for this environment, measurements at large temporal scales, the thermal variance is primarily affected by solar radiation, but at small temporal scales turbulent mixing of fluxes becomes the more dominant cause of the variance.

Paper Details

Date Published: 5 August 2004
PDF: 9 pages
Proc. SPIE 5431, Targets and Backgrounds X: Characterization and Representation, (5 August 2004); doi: 10.1117/12.541388
Show Author Affiliations
Jerrell R. Ballard, U.S. Army Engineer Research and Development Ctr. (United States)
Thomas E. Berry, U.S. Army Engineer Research and Development Ctr. (United States)
David L. Leese, U.S. Army Engineer Research and Development Ctr. (United States)
Stacy C. Anderson, U.S. Army Engineer Research and Development Ctr. (United States)
Laura S. Bunch, North Wind, Inc. (United States)


Published in SPIE Proceedings Vol. 5431:
Targets and Backgrounds X: Characterization and Representation
Wendell R. Watkins; Dieter Clement; William R. Reynolds, Editor(s)

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