USGS (U.S. Geological Survey) EROS Data Center, Sioux Falls, SD

	Data Sets:		1:250K DEM	1:24K DEM	30 m NED	1:2M DLG	1:100K DLG	1:24K DLG	LULC	NLCD	NHD

1:250,000 Scale Digital Elevation Models (DEM)
Examples Status Maps Data User Guide (National Mapping Program FTP) Elevation Program (USGS Rocky Mountain Mapping Center HTML) Condensed User Guide (HTML) Review the 00README before downloading! FTP via Alphabetical List FTP via State FTP via Graphics Back

1:24,000 Scale Digital Elevation Models (DEM) SDTS format only

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).

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).

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1:2,000,000 Digital Line Graphs (DLG) SDTS format only
Examples Data User Guide (National Mapping Program FTP) Condensed User Guide (Global Land Information System HTML) Review the 00README before downloading! SDTS format only. FTP via State FTP via Graphics SDTS DLGs require Master Data Dictionary Back

1:100,000 Scale Digital Line Graphs (DLG)
File names changes Example Status Maps Data User Guide (National Mapping Program FTP) Condensed User Guide (Global Land Information System HTML) Review the 00README for Native and the 00README.SDTS for SDTS before downloading data. FTP via Alphabetical List FTP via State FTP via Graphics SDTS DLGs require Master Data Dictionary Back

1:24,000 Scale Digital Line Graphs (DLG) SDTS Format Only
Example Status Maps Data User Guide (National Mapping Program FTP) Condensed User Guide (Global Land Information System HTML) Review the 00README before downloading! SDTS format only. FTP via Alphabetical List FTP via State FTP via Graphics SDTS DLGs require Master Data Dictionary Back

1:250,000 & 1:100,000 Scale Land Use Land Cover (LULC)
Examples Condensed User Guide (Global Land Information System HTML) Review the 00README before downloading! 250K FTP via Alphabetical List 250K FTP via State 250K FTP via Graphics Review the 00README before downloading! 100K FTP via Alphabetical List 100K FTP via State 100K FTP via Graphics Back

Files are not directly viewable!

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.

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FTP File Access

The EROS Data Center provides file transfer protocol (FTP) access to a variety of USGS digital data sets. The following is a list of each data set and includes: a link to data examples, a hyperlink to user guide information, and a list of the methods available for transferring the data using FTP. You can download files by connecting to the data set's anonymous FTP account and selecting files from the existing directory structure (FTP from account), by selecting from a list of states that will guide you to the appropriate files (FTP sorted by state), or by using the graphic option which allows you to select files using an index map (Graphics FTP). Not all FTP options are available for each data set. The user guide provides detailed information about the data set, including distribution formats.

If you use FTP from account, be sure to review the README (or 00README) file located in the first directory you encounter.
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Effective July 1, 1996
NOTICE: Effective July 1, 1996, the U.S. Geological Survey discontinued providing the Digital Line Graph (DLG-S) data in the Standard format. The Digital Line Graph (DLG-O) data in the Optional (Native) format will continue to be available. The newer Spatial Data Transfer Standard (SDTS) format availability will continue to increase as data are converted and/or produced in this format. Back

Note
Due to an error in processing, some 7.5' DEM files may contain an incorrect compilation method and version number. The problem is being corrected. To determine if a file has incurred this error, you may query the Global Land Information System and check the comment field of the detail window. Back

Note: Name Changes
Note: The file names have been changed to match the file naming structure from the production centers. A cross reference from the old naming convention to the new naming convention is available for optional (native) and SDTS formats. Back

SDTS Format Data Dictionaries
SDTS DLGs require the use of either the uncompressed SDTS Master Data Dictionary file as a single tar file for 1:2M, 100K, 1:24K or a series of uncompressed small files for 1:2M. 100K, 1:24K Back

SDTS Format Data Dictionaries
SDTS DLGs require the use of either the uncompressed SDTS Master Data Dictionary file as a single tar file or a series of uncompressed small files. Back

National Land Cover Data (NLCD)
Product Description Examples Products Classification Guide Back

National Hydrography Dataset (NHD)
Status Maps Technical References National Hydrographic Dataset Program Download Data Back

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.

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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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