Land Validation Campaigns
The goal of the EOS Validation Program is the comprehensive assessment of all
EOS science data products. ORNL DAAC supports these assessments by compiling
data such as leaf area index (LAI), and net primary productivity (NPP) for
global test sites to compare with satellite-derived products. These data are
unique in having ground-based observations coincident with satellite data. In
addition, this information is useful to develop, calibrate, and validate
The ORNL DAAC compiles, archives, and distributes more than 20 land validation
data products from the following NASA-funded research projects:
and through the following resources:
The Accelerated Canopy Chemistry Program (ACCP) was an investigation to
determine the theoretical and empirical basis for remote sensing of
nitrogen and lignin concentrations in vegetation canopies of different
ecosystems conducted at various U.S.A. sites between 1991 and 1993.
Available data include: Airborne Visible/Infrared Imaging Spectrometer
(AVIRIS) images, laboratory chemical analysis of field samples, laboratory
spectra and chemical analysis from several mini-canopy experiments, and
canopy modeling data.
The goal of the BigFoot Project was to support the validation of land products
from the Moderate Resolution Imaging Spectrometer (MODIS) onboard NASA's Earth
Observing System (EOS) Terra satellite. Reflectance data from MODIS were used
to produce several science products including land cover, leaf area index (LAI),
and net primary production (NPP). The BigFoot project began in 1999, concluded
in 2003, and was funded by
NASA's Terrestrial Ecology Program
The objective of the EOS Land Validation Project is to achieve consistency,
completeness, and a timely flow of data in support of the validation of EOS
Land Products, especially MODIS, ASTER, MISR, and LANDSAT 7. The 31
EOS Land Validation
span a range of biome types and represent consensus amongst the
instrument teams and validation investigators. Available data include site
leaf are index (lai). EOS Land Validation is an active project.
FLUXNET, a network of regional networks, coordinates regional and global
analysis of observations from micrometeorological tower sites that use
eddy covariance methods to measure exchanges of carbon dioxide, water
vapor, and energy between terrestrial ecosystems and the atmosphere.
FLUXNET is comprised of more than 500 tower sites from about 30 regional
networks across five continents. FLUXNET is an active project.
The Prototype Validation Exercise (PROVE) was a mini field campaign conducted
in May 1997 near Las Cruces, New Mexico, U.S.A, at the Jornada Experimental Range.
Prove sought to gain experience in the collection and use of field data for EOS
product validation, to develop protocols for coordination, measurement, and data-
archival, and to compile a synoptic land and atmosphere data set for testing
The goal of the Moderate Resolution Imaging Spectroradiometer (MODIS) Land Product
Subsets project is to provide summaries of selected MODIS Land products for community
use in the validation of models and remote-sensing products and in the characterization
of field sites. Output files contain pixel values in text and GeoTIFF format, with
time series plots and grids for composite periods. The MODIS Land Product Subsets Project
is an active project.