Recent Federal actions have been moving toward data standards to allow more efficient use and interchange of spatial data. Your GIS and remote sensing personnel should be familiar with these requirements. Included here is an introduction to geospatial data standards that may be useful when working with a contractor. The authors of this section are Mark Graves, Environmental Laboratory, Vicksburg, MS, and Joe Watts, Topographic Engineering Center, Alexandria, VA, both with the U.S. Army Engineer Research and Development Center. The text is modified from Graves and Watts (2000b).