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BOREAS TE-6 Multiband Vegetation Imager DataThe BOREAS TE-6 team collected data in support of its efforts to examine the influence of vegetation and climate on the major carbon fluxes in boreal tree species. A newly developed ground-based canopy imaging system called an MVI was tested and used by the BOREAS TE-06 team to collect measurements of the canopy crap fraction (sky fraction), canopy gap-size distribution (size and frequency of gaps between foliage in canopy), branch architecture, and leaf angle distribution (fraction of leaf area in specific leaf inclination classes assuming azimuthal symmetry). Measurements of the canopy gap-size distribution are used to derive canopy clumping indices that can be used to adjust indirect LAI measurements made in nonrandom forests. These clumping factors will also help to describe the radiation penetration in clumped canopies more accurately by allowing for simple adjustments to Beer's law. Measurements of the above quantities were obtained at BOREAS NSA-OJP site in IFC-2 in 1994, at the SSA-OA in July 1995, and at the SSA-OBS and SSA-OA sites in IFC-2 in 1996. Modeling studies were also performed to further validate MVI measurements and to gain a more complete understanding of boreal forest canopy architecture. By using MVI measurements and Monte Carlo simulations, clumping indices as a function of zenith angle were derived for the three main boreal species studied during BOREAS. The analyzed data are stored in tabular ASCII files. The data files are available on a CD-ROM (see document number 20010000884), or from the Oak Ridge National Laboratory (ORNL) Distrobuted Activity Archive Center (DAAC).
Document ID
20010005738
Acquisition Source
Goddard Space Flight Center
Document Type
Technical Memorandum (TM)
Authors
Hall, Forrest G. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Curd, Shelaine (Raytheon Information Technology and Scientific Services Greenbelt, MD United States)
Kucharik, Christopher J. (Wisconsin Univ. Madison, WI United States)
Date Acquired
September 7, 2013
Publication Date
October 1, 2000
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NAS 1.15:209891/VOL146
NASA/TM-2000-209891/VOL146
Rept-2000-03136-0/VOL146
Funding Number(s)
PROJECT: RTOP 462-33-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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