NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
BOREAS RSS-19 1994 Seasonal Understory Reflectance DataThe BOREAS RSS-19 team collected airborne remotely sensed images and ground reflectance data for characterizing the radiometric properties of the boreal forest landscape. One objective of BOREAS is to further the understanding of the spectral bidirectional reflectance of typical boreal ecosystem stands in the visible/near-infrared regime. An essential input for any canopy BRDF model is an accurate estimate of the average understory reflectance, both for sunlit and shaded conditions. These variables can be expected to vary seasonally because of species-dependent differences in the phenological cycle of foliar display. In response to these requirements, the average understory reflectance for the flux tower sites of both the NSA (Thompson, Manitoba) and the SSA (Candle Lake, Saskatchewan) was observed throughout the year during five field campaigns. This was done by measuring the nadir reflectance (400 to 850 nm) of sunlit and shaded understory (vegetation and snow cover) along a surveyed LAI transect line (Chen, RSS-07) at each site near solar noon and documenting an average site reflectance. Comparisons between sites reveal differences in the green and infrared regions of the spectra, because of the differing species in the understory for each site. Temporal (seasonal) variation for each site was also observed (06-Feb-1994 to 16-Sep-1994), indicating the changing flora mixtures and changing spectral signatures as the understory matures during the growing season. The 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) Distributed Active Archive Center (DAAC).
Document ID
20000116472
Acquisition Source
Goddard Space Flight Center
Document Type
Technical Memorandum (TM)
Authors
Miller, John R. (York Univ. Ontario Canada)
Hall, Forrest G. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Nickerson, Jaime (Raytheon Information Technology and Scientific Services Greenbelt, MD United States)
White, H. Peter (York Univ. Ontario Canada)
Peddle, Derek (Waterloo Univ. Ontario Canada)
Freemantle, Jim (Institute for Space and Terrestrial Science Canada)
Smith, David E.
Date Acquired
September 7, 2013
Publication Date
August 1, 2000
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NAS 1.15:209891/VOL77
Rept-2000-03136-0/VOL77
NASA/TM-2000-209891/VOL77
Funding Number(s)
PROJECT: RTOP 462-33-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available