The 1999 Digital Mapping Techniques workshop included close to 100 experts from agencies, universities, companies, and state geological surveys. As a collaboration between the Association of American State Geologists (AASG) and the US Geological Survey (USGS), and hosted by the Wisconsin Geological and Natural History Survey, the goal of the workshop was "to help move the state surveys and the USGS toward development of more cost-effective, flexible, and useful systems for digital mapping and GIS analysis." From the proceedings, the 45 papers included here focus on methods for creating and publishing map products, developing the National Geologic Map Database, and building a standard geologic map data model.