High-resolution spatial measurements of minefield vegetation density and modeled surface heat flux

Jerrell R. Ballard Jr.

doi:10.1117/12.604276

10 June 2005 High-resolution spatial measurements of minefield vegetation density and modeled surface heat flux

Jerrell R. Ballard Jr.

Proceedings Volume 5794, Detection and Remediation Technologies for Mines and Minelike Targets X; (2005) https://doi.org/10.1117/12.604276
Event: Defense and Security, 2005, Orlando, Florida, United States

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.

Citation Download Citation

Jerrell R. Ballard Jr. "High-resolution spatial measurements of minefield vegetation density and modeled surface heat flux", Proc. SPIE 5794, Detection and Remediation Technologies for Mines and Minelike Targets X, (10 June 2005); https://doi.org/10.1117/12.604276

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