The Accuracy and Precision Revolution By Jeffery S. Nighbert, U.S. Bureau of Land Management What's ahead for GIS? Figure 1 Typical base data displayed at 1:10,000 scale. Hillshade and contours were derived from the National Elevation Dataset, hydrography from the National Hydrography Dataset, and roads from internal files. 34 ArcUser Winter 2010 www.esri.com