NASA LogoNTRSNTRS - NASA Technical Reports ServerSearchmore_vertCollectionsAboutNewsHelpLogin Back to ResultsBOREAS 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 ID20000116472Acquisition SourceGoddard Space Flight CenterDocument TypeTechnical Memorandum (TM)AuthorsMiller, 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 AcquiredSeptember 7, 2013Publication DateAugust 1, 2000Subject CategoryEarth Resources And Remote SensingReport/Patent NumberNAS 1.15:209891/VOL77Rept-2000-03136-0/VOL77NASA/TM-2000-209891/VOL77Funding Number(s)PROJECT: RTOP 462-33-01Distribution LimitsPublicCopyrightWork of the US Gov. Public Use Permitted.Available DownloadsNameType20000116472.pdfSTIcloud_downloadcontent_copyvisibilityRelated RecordsThere are no records associated with this record.visibility_offNo Preview Available
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