The ADOL site contains a wide assortment of geographic information that users can access to create map images and download data. Data are accessed via the Web or in shapefile format. The purpose of this page is to consolidate access to information about GIS which may be useful to the GIS community. A host of resources including numerous outside WWW links, several databses with metadata, search engines, documentation and FAQs, BLM News and Updates, and more. An extremely large amount of data is available for an equally large variety of applications.
Data come in various formats though in most cases software to read the data is also available.
Great for teaching and quick browsing purposes. Also provides links to external web resources for each state. Documentation and data can be directly downloaded from this page. Closely related, you may also want to check out The Digital Chart of the World Server from Penn State. The USGS EROS Data Center provides a huge number of data products, including millions of aerial photographs of the United States as well as images from several satellite programs.