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Published: 1998

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The following U.S. Geological Survey digital maps are available via FTP from the EROS Data Center (some in Spatial Data Transfer Standard (SDTS) format only): 1) 1:250,000 scale digital elevation model (DEM); 2) 7.5 minute digital elevation model (DEM), in SDTS format only; 3) 1:2,000,000 scale digital line graphs (DLG), in SDTS format only; 4) 1:100,000 digital line graphs (DLG); 5) 1:24,000 digital line graphs (DLG), in SDTS format only; and, 6) 1:250,000 and 1:100,000 scale land use and land cover (LULC). 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. Note: These data files are for use in geographical information systems 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 (GIS) software. Available display software may be found under "Public Domain Software."