It also includes multimedia map tours, interactive timelines that trace the evolution of mapping, key events in National Geographic cartography, and stories about the people and places behind these special maps. A bibliographic database of cartographic holdings in the United States. Users can use the simple DOS interface to search by keywords, subjects, and geographic area to identify places where cartographic resources are located. Most of this same data and much more is now available online for download from the USGS Geospatial Data Clearinghouse . Please visit this site to determine the format and availability of the data you need.
Some data sets are available online at no cost.
For others, you may need to set up an account to pay a distribution fee. Some data sets are not online and you will be instructed how to order a compact disk or a tape. No viewing software is included on the CDs, but they can be extracted into standard GIS formats using commercially produced software. Requires Arcview and Acrobat Reader. DOQs digital images are produced by scanning an aerial photograph that meet National Aerial Photography Program Standards with a precise, high-resolution scanner.