HR: 0830h
AN: B21E-0753    [PDF]
TI: Remotely Sensed and In Situ Data Availability for Validation of EOS Land Data Products
AU: Dwyer, J
EM: dwyer@usgs.gov
AF: SAIC, USGS EROS Data Center, Sioux Falls, SD 57198 United States
AU: * Morisette, J
EM: jeff.morisette@gsfc.nasa.gov
AF: NASA, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AB: In support of the NASA Earth Observing System (EOS) Land Product Validation investigations, numerous remotely sensed data and field measurements are being collected at core validation sites around the world. These `core sites' represent different biomes and include locations at which in situ measurements are routinely collected. The types of remotely sensed data that are being acquired and analyzed over these sites include Landsat 7 ETM+, ASTER, MODIS, and SPOT VEGETATION. The data being collected over these sites are being used to monitor ecosystem status, compile time-series records of biophysical and geophysical parameters, and to validate the suite of land products being derived from MODIS data. In order to facilitate easy access to the remotely sensed data being collected over these core sites, the data are stored online under FTP directories established by the Land Processes Distributed Active Archive Center (LP DAAC) at the USGS EROS Data Center. In situ measurements and data collected through field campaigns are being coordinated by the Oak Ridge National Laboratory Distributed Active Archive Center (ORNL DAAC) and being made accessible through the Mercury system, which is a web-based search engine (http://mercury.ornl.gov/ornldaac/). Access to many of the remotely sensed and in situ data sets collected over the EOS Land Validation `core sites' can be accessed through Mercury or the MODIS Land Validation web page (http://modarch.gsfc.nasa.gov/MODIS/LAND/VAL/). We are hoping to stimulate interest and participation by the Validation of Land European Remote Sensing Instruments (VALERI, http://147.100.0.5/valeri//) to extend the network and diversity of sites as well as increase collaborative research. We have developed a web portal that enables investigators to select a particular site of interest, determine what data are available for that site, and select datasets for ftp download. Certain services may be requested to be applied to the data prior to download, including: spatial and parameter subsetting, projection transformation, and file format conversion. The scientific rationale for this project is predicated on improving international and interdisciplinary collaboration in the assessment, application, and improvement of remotely sensed data products and services available to the research community. Efforts to validate remotely sensed data products at a global scale are unprecedented, yet such efforts are necessary in order to quantify the errors or uncertainties associated with these derived geophysical and biophysical parameters. These products must be evaluated over a wide range of land surface conditions and on a regular basis.
DE: 0400 Biogeosciences
DE: 1615 Biogeochemical processes (4805)
SC: Biogeosciences [B]
MN: 2003 Fall Meeting