Products based on NASA Earth observations and a new Internet-based decision tool are providing information to help land and water managers combat tamarisk (saltcedar), an invasive plant species damaging precious water supplies in the western United States. This decision tool, called the Invasive Species Forecasting System (ISFS), is being used at the U.S. Geological Survey (USGS) National Institute of Invasive Species Science in Fort Collins, Colo. It is the result of combining USGS science and NASA Earth observations, software engineering and high- performance computing expertise. "The ISFS combines NASA satellite data with tens of thousands of field sampling measurements, which...