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giswr
> events
> 1st nhda symposium
> tuesday >
seamless access for the usgs's ned
Seamless Access and Delivery
for the USGS's National Elevation Dataset
The U.S. Geological Survey (USGS) and the Environmental
Systems Research Institute (ESRI) have entered into a Cooperative
Research and Development Agreement (CRADA) to prototype
spatial data modeling, access, and distribution systems
for large-scale databases. The National Elevation Dataset,
at arc-second resolution, was loaded into an Oracle database
for access by ESRI's Spatial Database Engine. Because the
data were assembled from many sources and production methods,
complete metadata require a spatial reference layer to track
their lineage. A "metadata engine" clips out the necessary
metadata "on-the-fly" for delivery with the requested elevation
and/or land cover data. The resulting product can be staged
for FTP access, or directed to offline media (e.g. CDR)
that is then shipped to the customer. The system was designed
to be in full compliance with USGS standards for metadata
(FGDC) and for data transfer (SDTS). An OGIS connector provides
for optional OGIS compliant connections. The seamless server
will be used to provide imagery and thematic data for several
GIS applications, including a rapid response demonstration
project (e.g. Red River) and a web application for providing
time-relevant environmental data (e.g. Sioux River Project
Empact). It is hoped that this prototype will be the first
in a series of USGS geospatial data servers that provide
seamless access to Landsat imagery, Shuttle Radar Topography
Mission (SRTM) data, and other applications that require
browse and delivery of large images over the Internet.
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