BIO: Chris J. Johannsen is Professor Emeritus of Agronomy, Purdue University. His BS and MS degrees are from University of Nebraska and Ph.D. from Purdue University. Dr. Johannsen has been employed at University of Missouri, University of California and Purdue University focusing on soil conservation, land use and precision farming topics using remote sensing and geographic information systems technology. He is the author or co-author of over 225 articles, papers, and book chapters and has edited a book on remote sensing. At Purdue he served as Director of Laboratory for Applications of Remote Sensing (LARS) from 1985 through 2003. Dr. Johannsen is recognized as a national and international authority on remote sensing applications in agriculture.