Data Products

No. A photographic enlargement only appears to show more detail than a 9-by-9 inch photograph. Photographic resolution (or image resolution) deteriorates with each enlargement factor.Photographic reproduction of images from the USGS film archives ceased...
YES, Visit our National Geospatial Program page or call 1-888-ASK-USGS for our information package on digital cartographic data. 
MICRODEM is a free software package with a built-in DEM converter. It requires a 32 bit version of Windows (NT/2000/XP or 95/98/ME).Software packages that will read DEMs:ARC/INFO (grid module)PCI (will only import 30-meter USGS DEMs)ERDAS...
USGS DLG files must be translated into DXF before AutoCAD can read the files. Here is one way this can be accomplished:Download a DLG to DXF converter. There are different versions of this program depending on the version of AutoCAD.DLGTODXF - for...
That depends on what kind of reprojection you want to do. In some cases, if you want to reproject from one datum to another (specifically NAD 27 to NAD 83 or NAD 83 to NAD 27), a simple xy shift will suffice. This shift will not introduce measurable...
Data are offered in both compressed ARC workspaces and compressed SDTS transfer format. 
Medium resolution NHD data are available at 1:100,000 scale for the conterminous US and Hawaii. High resolution NHD data are available for Puerto Rico at 1:20,000 scale and the Virgin Islands at 1:24,000 scale. In addition, data for Alaska are being...
It will probably take approximately 5 years to digitize the archive. A priority scheme is being developed and will be made available to the public at a later date.
The U.S. Environmental Protection Agency's (EPA) Reach Files are a series of national hydrologic databases that uniquely identify and interconnect the stream segments or 'reaches' that comprise the country's surface water drainage system. The three...
Digital elevation model (DEM) data are arrays of regularly spaced elevation values referenced horizontally either to a Universal Transverse Mercator (UTM) projection or to a geographic coordinate system. The grid cells are spaced at regular intervals...