Summary Report and Recommendations
The workshop was held at the H.J. Andrews LTER site near Blue River Oregon
on May 21 and 22 with support from the LTER Network Office.
Twenty people attended, including participants from Brazil,
Hungary and Korea. The workshop was intended to promote data exchange
between the remote sensing community -- which has begun to produce global land cover,
leaf area index, and net primary production products -- and the field
sites where relevant validation data is being produced.
Specifically, the workshop was aimed at fostering participation
of a variety of field sites in the LTER sponsored NPP Demonstration
Project. The more general context was the evolution of the Global
Terrestrial Observing System which will ultimately provide policy makers with
assessments of status and trends for variables such as global NPP.
Initially, a review of the 1 km resolution gross primary production and
net primary production products from the satellite-borne MODIS sensor was given.
There followed a series of site reports from locations where NPP data layers, with
potential to serve in a validation capacity, are being generated. The
biomes represented included the arctic tundra, boreal forest,
temperate deciduous forest, temperate conifer forest, cropland, and
tropical moist forest. The minimum requirement for participation in
the NPP Demo Project is a well-georeferenced, 3 x 3 km, NPP data layer,
and a number of valid approaches to developing these data layers were reported.
After the site reports, a session was devoted to data transfer from the remote
sensing community to the sites. At present, near
real time MODIS data is available on the Internet in the form of 1100
x 1100 km "tiles" from the EROS Data Center.
For sites which participate in the NPP Demo Project, it is
planned that regular 11 x 11 km cutouts of selected MODIS products
will be provided beginning summer 2001 by the ORNL DAAC.
Potential applications of the MODIS products include regional
estimation of wood or crop production, tracking of drought effects,
and evaluation of snow cover.
The workshop concluded with a discussion of how to promote wider participation in the NPP
Demonstration Project. Recommendations include: 1) developing and distributing
specific instructions for participation, 2) getting several sample NPP
data layers in the preferred format on the NPP Demo Project web site
now (this will be done for some of the BigFoot sites), 3) encouraging
GTOS to provide an ETM+ scene to participating sites on request so
that a land cover map could be readily generated, 4) encouraging the
collection of the 250 m resolution MODIS products for the NPP Demo
Project sites, 5) encouraging continued support for the NPP Demo
Project, perhaps with involvement of FAO and/or the ORNL Mercury
System for database management, 6) planning a workshop for early 2002
to do an assessment of the first year of MODIS NPPs, and 7) continuing
support for sites and projects involved in the development of the
validation data sets.
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