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Effective May 1, 2005 -- Due to new Department of Interior security requirements, the National Center, EROS will no longer allow anonymous FTP access to Geodata Products for download (i.e. DLG's). This DOES NOT affect access to data from the Geodata website (http://eros.usgs.gov/geodata) or Earthexplorer (http://earthexplorer.usgs.gov). That acces is through an http connection. Please email any questions or concerns to webmapping@usgs.gov.

Note: These data files are for use in geographical information systems(GIS) for analysis and integration with other geospatial data. They are not directly viewable using WWW browser or image viewing tools. The USGS offers free software for viewing some digital cartographic products, including DLG-O, DEM, DLG/SDTS and DRG data. These viewers run on Windows 95/NT only. They are tools for data preview, and are not substitutes for commercial geographic information system software. Available display software may be found in the "Public Domain Software" Web page.

Status Maps are available for a limited number of data sets.

Geographic Data Download Statistics

Public Domain Software for use with DEM, DLG, DRG, LULC, and SDTS files.

Spatial Data Transfer Standard (SDTS) information. Note: Please be aware that not all Native files have been converted to SDTS format. For a complete listing of data available in Native and SDTS, please go to EarthExplorer.

The USGS has two options for acquiring 1:24,000-Scale (7.5-minute) Digital Elevation Model data.

1) The original DEM 7.5 minute tiled data available only in Spatial Data Transfer Standard (SDTS) form is available at no cost via downloads from the GeoComm International Corporation at http://gisdatadepot.com/dem and from MapMart.com at http://www.mapmart.com, and from Advanced Topographic Development and Images (ATDI) at http://www.atdi-us.com. (See disclaimer).

Disclaimer
******************************************************************************************************* The U.S. Geological Survey (USGS) has entered into an agreement with the GeoCommunity, MapMart.com, and ATDI, to serve updated, SDTS format, Digital Elevation Models (DEMs) through the GIS Data Depot at http://www.gisdatadepot.com and at MapMart.com at http://www.mapmart.com, and ATDI at http://www.atdi-us.com for no charge. The 7.5' SDTS DEM data are also available for purchase via premium (fast) download and on CD-ROM from GeoCommunity and for purchase on CD-ROM from MapMart.com.

The decision to provide SDTS DEMs through commercial vendors is consistent with the USGS goal of making more public domain data available at no charge while enabling the private sector to have a greater role in the distribution of USGS data. SDTS DEMs placed on media in response to customer orders will be sold by our partners at a price less than the USGS currently charges.

The GeoCommunity, MapMart.com, and ATDI will continue to receive SDTS versions of the DEMs as they are made available by the USGS. Native format DEMs are still available for sale from USGS on various media and via ftp.

If you have additional questions or comments, please contact us at sdts@usgs.gov. Please monitor the SDTS Home Page for further news and updates on this issue. http://mcmcweb.er.usgs.gov/sdts
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2) The National Elevation Dataset (NED) is the result of the maturation of the USGS effort to provide 1:24,000-scale Digital Elevation Model (DEM) data for the conterminous U.S. and 1:63,360-scale DEM data for Alaska in a seamless form. Available data formats include ArcGrid, Floating Point, and BILS. For more information see (30m NED button), or go directly to the Seamless Data Distribution System at (Seamless Store).

30m NED button: 30 Meter Resolution National Elevation Dataset
Merging the highest-resolution, best-quality elevation data available across the United States into a seamless raster format has developed the USGS National Elevation Dataset (NED). NED is the result of the maturation of the USGS effort to provide 1:24,000-scale Digital Elevation Model (DEM) data for the conterminous US and 1:63,360-scale DEM data for Alaska. Seamless Data Distribution System (SDDS) offers seamless data for sale, by user-defined area, in a variety of formats.