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BOREAS_UND_REFL BOREAS RSS-19 1994 Seasonal Understory Reflectance Data MILLER, J.R.; PEDDLE, D.R.; FREEMANTLE, J.R. BOREAS RSS-19 1994 Seasonal Understory Reflectance Data 1999 Oak Ridge, Tennessee, U.S.A. Oak Ridge National Laboratory Distributed Active Archive Center Online Files doi:10.3334/ORNLDAAC/304 304

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.

1994-02-06 1994-09-16 COMPLETE 53.8 55.93 -105.12 -98.29 ESIP Earth Science Information Partners Program EOSDIS Earth Observing System Data Information System TECHNICAL CONTACT ORNL DAAC User Services ORNL DAAC USER SERVICES OFFICE OAK RIDGE NATIONAL LABORATORY OAK RIDGE, TENNESSEE 37831 USA DIF AUTHOR ORNL DAAC User Services ornldaac@ornl.gov (865) 241-3952 (865) 574-4665

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Oak Ridge Tennessee 37831-6407 USA 1999-01-30 ORNL_DAAC THE OAK RIDGE NATIONAL LABORATORY (ORNL) DISTRIBUTED ACTIVE ARCHIVE CENTER (DAAC) http://daac.ornl.gov/ 304 DATA CENTER CONTACT ORNL DAAC USER SERVICES ornldaac@ornl.gov +1(865)241-3952 +1(865)574-4665

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Oak Ridge Tennessee 37831-6407 USA EARTH SCIENCE BIOSPHERE ECOSYSTEMS TERRESTRIAL ECOSYSTEMS EARTH SCIENCE LAND SURFACE SURFACE RADIATIVE PROPERTIES REFLECTANCE SPECTRORADIOMETERS FIELD INVESTIGATION EARTH SCIENCE BRDF REFLECTANCE SPECTRORADIOMETER GET DATA http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=304 VIEW RELATED INFORMATION https://daac.ornl.gov//BOREAS/guides/RSS19_Undstry_refl.html BOREAS RSS-19 1994 Seasonal Understory Reflectance Data USA/NASA ENGLISH GCMD CEOS IDN DIF VERSION 9.0