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Proceedings Paper

High-resolution spatial measurements of minefield vegetation density and modeled surface heat flux
Author(s): Jerrell R. Ballard
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Paper Abstract

Thermal infrared signatures of natural landscapes can vary greatly temporally and spatially. In our research, we describe our preliminary results of the spatial variability of vegetation thermal infrared signatures and vegetation density in a mid-western test minefield characterized by a linear PAR (Photosynthetically Active Radiation) ceptometer and ground-based laser radar. The linear PAR ceptometer consists of a probe about 80-cm long that contains 80 photodiodes that are sensitive to the PAR waveband. The probe calculates leaf area index (LAI, projected leaf area per unit ground area) based on sun zenith angle, leaf angle distribution, and fraction of solar beam radiation. For the 50-m by 175-m test area, the vegetation leaf area index varied from 0.1 to 4.8 and laser measured vegetation height ranged from 0.1-m to 1.9-m. The high-resolution laser radar data are used to estimate high-resolution leaf area index from the coarse PAR ceptometer measurements. These data, combined with local meteorological data, are then used to model the spatial (0.5-m) distribution of surface heat flux under a vegetation canopy.

Paper Details

Date Published: 10 June 2005
PDF: 7 pages
Proc. SPIE 5794, Detection and Remediation Technologies for Mines and Minelike Targets X, (10 June 2005); doi: 10.1117/12.604276
Show Author Affiliations
Jerrell R. Ballard, U.S. Army Engineer Research and Development Ctr. (United States)

Published in SPIE Proceedings Vol. 5794:
Detection and Remediation Technologies for Mines and Minelike Targets X
Russell S. Harmon; J. Thomas Broach; John H. Holloway, Editor(s)

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