Datasets are organized geographically, and most can be downloaded for free. Free GIS software is also available. Site is searchable. A comprehensive source of information about global change data available to the scientific community from throughout the world. Data sets include coverage of the oceans, atmosphere, hydrosphere, solid earth, biosphere, and human dimensions of global change.
Site is searchable.
Many links to hydrology related resources including data sources, bibliographies, discussion groups, research organizations, projects, and more. Site is searchable. A collection of hundreds of links to hydrogeological organizations, software and data repositories, publications, and other resources of potential use to hydrogeologists. Maintained by the University of Arizona s Department of Hydrology and Water Resources, links to sources of data and information are organized by broad categories such as Satellite Data, Meteorology, Hydrology, Water Quality, Models, etc. Complete text and figures of this USGS publication.