Visible/Infrared Intelligent Spectrometer Reflectances During the Forest Ecosystem Dynamics - Multisensor Aircraft CampaignEntry ID: FEDMAC_VIRIS
Abstract: Forest Ecosystem Dynamics Multisensor Airborne Campaign (FED MAC):
Visible/Infrared Intelligent Spectrometer (VIRIS) Reflectances
The Biospheric Sciences Branch (formerly Earth Resources Branch)
within the Laboratory for Terrestrial Physics at NASA's Goddard Space
Flight Center and associated University investigators are involved in
a research program entitled ... Forest Ecosystem Dynamics (FED) which is
fundamentally concerned with vegetation change of forest ecosystems at
local to regional spatial scales (100 to 10,000 meters) and temporal
scales ranging from monthly to decadal periods (10 to 100 years). The
nature and extent of the impacts of these changes, as well as the
feedbacks to global climate, may be addressed through modeling the
interactions of the vegetation, soil, and energy components of the
The Visible/Infrared Intelligent Spectrometer (VIRIS), developed as
the IRIS Mark IV by GER, Inc., and a portable
illumination source (a spectralon coated hemisphere/baffle system
employing 4, high-intensity, quartz line, 30 W
bulbs) were used to characterize the reflectance of branch samples
with needles attached (spruce and hemlock).
The VIRIS provides 2 nm spectral resolution from 0.4 - 1.1 um, and 4
nm spectral resolution from 1.1 - 2.5 um. The
portable illumination source is placed at a standard distance (50 cm
at an incidence angle of 35 degrees) from the
branch samples. Single aged branch segments (1st-year and 2nd-year)
were arranged in standard sample trays
placed at a distance of 75 cm from the optical head of the VIRIS,
yielding a field-of-view of 1.8 by 4.8 cm.
A total of three spectral scans were acquired and averaged to give a
single VIRIS reflectance data set. Multiple data
sets (i.e., each consisting of different branch segments) were
acquired for each age class, using branch segments
from the upper canopy of each tree. A software program known as the
Integrated Data Management Module (IDMM) was developed at the
University of New Hampshire and used for the analysis of VIRIS data.
The program divides each spectral curve into a series of smaller,
more workable spectral regions. From each spectral curve, 81 different
reflectance, derivative and wavelength parameters were extracted
(not all were included in this data set collection).
The FED Home Page is at: http://forest.gsfc.nasa.gov/.
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: Barrett N. Rock
Dataset Title: Visible/Infrared Intelligent Spectrometer (VIRIS) Reflectance
Dataset Series Name: FED MAC Home Page
Dataset Release Place: NASA/GSFC
Dataset Publisher: NASA/GSFC
Data Presentation Form: ASCII TablesOnline Resource: http://forest.gsfc.nasa.gov/
Start Date: 1990-09-06Stop Date: 1990-09-11
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Angell, J.K., and J. Korshover. 1983. Global temperature variations in the troposphere and stratosphere, 1958-82. Monthly Weather Review 111:901-21.
Creation and Review Dates
DIF Creation Date: 2010-12-15
Last DIF Revision Date: 2010-12-30