Iowa State University researchers have developed a way to use satellite images to find Asian soybean rust. "What we did on the ground 10 to 15 years ago, we can do now with satellites," said Forrest Nutter, professor of plant pathology. Using remote sensing, Global Positioning System and Geographical Information System technologies, scientists can measure the green leaf area of soybeans to detect and identify diseases down to the area of a square meter, about 1.2 square yards.