The land cover data for the Land Cover Trends project is available for free download by anyone interested in further analysis and geographic research. The data is packaged by ecoregion and compressed into a ZIP file for easy distribution. Each ecoregion zip file contains sample block folders with 5 images in ERDAS Imagine format corresponding to the 5 Trends study years of 1973, 1980, 1986, 1992, and 2000. The actual image date for each temporal sample may differ from the study years due to image quality and availability. Information on the classification system used and the class definitions can be found on the Land Cover Classification System page. Addition information and metadata on the images will be part of a USGS data series currently in preparation.