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2000 - The National Elevation Dataset - The
National Elevation Dataset (NED) is a seamless dataset of elevation values that
is well-suited for graphic visualization and has been processed to minimize
discontinuities and to fill in void areas that would otherwise be blemishes in
graphic representations. NED has been developed by merging the
highest-resolution, best-quality elevation data available across the United
States into a seamless raster format.
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2002 -- The National Map is a seamless, continuously maintained set of public domain
geographic base information that serve as a foundation for integrating, sharing, and using other data easily and consistently.
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Learn more about USGS programs and products by visiting the following web
sites.
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U.S.
Geological Survey Museum - This collection serves to illustrate important
achievements and challenges to the Earth Sciences, to document the history of
USGS, and to enlighten those who use the collection.
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Geographic
Names Information System - The Geographic Names Information System (GNIS),
developed by the USGS in cooperation with the U.S.
Board on Geographic Names (BGN), contains information about almost 2 million
physical and cultural geographic features in the United States. The Federally
recognized name of each feature described in the data base is identified, and
references are made to a feature's location by State, county, and geographic
coordinates. The GNIS is our Nation's official repository of domestic
geographic names information.
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TerraServer - TerraServer
contains 3.3 tera-bytes of high resolution USGS
aerial imagery and USGS
topographic maps. The Microsoft TerraServer Web site, a USGS Cooperative
Research and Development Agreement, is one of the world's largest online
databases, providing free public access to a vast data store of maps and aerial
photographs of the United States. TerraServer is designed to work with commonly
available computer systems and Web browsers over slow speed communications
links. The TerraServer name is a play on words, with 'Terra' referring to
the 'earth' or 'land' and also to the terabytes of images stored on the site.
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TopoZone
- TopoZone, through the USGS Business Partner Program, provides an
interactive interface which allows users to view a seamless topographic map and
feature database of the entire United States, based on digital raster graphics.
The site is accessible to anyone with an industry standard Web browser at no
charge.
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EarthExplorer
- EarthExplorer allows users to query
and order satellite images, aerial photographs, and cartographic
products through the U.S. Geological Survey.
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GISDATA
Web Mapping Portal - GISDATA is provides access to geospatial
datasets that have been specially prepared for seamless access and delivery.
Some data serve many applications and have national extent. Other data were
prepared for a particular time or event, and usually for a limited region.
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