The GDEx data access interface is the result of collaboration between the Land Processes Distributed Active Archive Center and George Mason University's Center for Spatial Information Science and Systems. This GDEx tool allows users to browse and download data based on geographic areas of interest or predefined regions, including state, province, and county (for the United States). The majority of the data are available for download at no cost. Click here for a list of data products. Note: Users are required to register for a NASA User Registration System (URS) account to download data.