Oak Ridge National Laboratory Distributed Active Archive Center

nasa-ornldaac-304

BOREAS RSS-19 1994 Seasonal Understory Reflectance Data

ABSTRACT: One objective of BOREAS is to further the understanding of the spectral bi-directional 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) Study Areas (NSA and SSA) 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 a 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, indicating the changing flora mixtures and changing spectral signatures as the understory matures during the growing season.

daac.ornl.gov

http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=304

Identified by : BOREAS_UND_REFL

This dataset was released on January 01, 1999.

The time range for this dataset is February 06, 1994 to September 16, 1994.

The spatial range for this dataset is 53.8° to 55.93° latitude, and -105.12° to -98.29° longitude. map (center)

DOI : 10.3334/ORNLDAAC/304
Also known as :

• dataset oai:mercury-ops2.ornl.gov:ornldaac_304 (ornl lexicon)
• dataset oai:mercury.ornl.gov:ornldaac_304 (ornl lexicon)