From SUL:

Stanford University Libraries is happy to introduce EarthWorks, our new geospatial data discovery application. EarthWorks is a discovery tool for geospatial (a.k.a. GIS) data. It allows users to search and browse the GIS collections owned by Stanford University Libraries, as well as data collections from many other institutions. Data can be searched spatially, by manipulating a map; by keyword search; by selecting search limiting facets (e.g., limit to a given format type); or by combining these options.

Data are available from numerous research institutions across the United States covering a vast array of subjects and base layer information. Thousands of datasets in vector and raster format have been described at the individual layer level allowing for easy searching and retrieval. [Our emphasis] You will find both public and restricted data. The restricted data are tied to the institution that holds the content.

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EarthWorks is built on top of the open-source project GeoBlacklight, which adds geospatial capabilities to the widely used discovery system Project Blacklight. GeoBlacklight is the product of an ongoing software collaboration between MIT, Princeton, and Stanford. Contributions and collaborators are most welcome! GeoBlacklight can be used on its own, or as part of GeoHydra, an emerging suite of tools for managing geospatial data assets within a Hydra data repository. For more information about GeoHydra, please see the Hydra Geospatial Interest Group wiki.

Metadata sharing for EarthWorks is enabled through collaboration with the OpenGeoPortal project and the new OpenGeoMetadata initiative.

EarthWorks also uses GeoMonitor to monitor the availability of data being provided by the network of collaborating institutions.