Geosciences/Geographic Information Systems (GIS)
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Geographic Names Information SystemA component of the National Geospatial Program (NGP). The official repository of domestic geographic names data, as standardized by the United States Board on Geographic Names. The GNIS contains information about physical and cultural geographic features of all types in the United States, associated areas, and Antarctica, current and historical, but not including roads and highways. Data available as downloadable text files.
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The National MapA component of the National Geospatial Program (NGP). A repository of topographical data, including orthoimagery (aerial photographs), elevation, geographic names, hydrography, boundaries, transportation, structures, and land cover.
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EarthChem.orgGeochemical data from a variety of sources worldwide. Advanced search interface allows users to define many parameters to find appropriate information.
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GeoGratisGeospatial information from the Canadian federal government, including topographic maps and GIS data.
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GeoNamesA database of placenames, under a CC-BY license. Founded by Marc Wick.
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NASA Space Science Data Coordinated ArchiveThe NASA Space Science Data Coordinated Archive serves as the permanent archive for NASA space science mission data.
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National Centers for Environmental InformationNCEI provides over 25 petabytes of comprehensive atmospheric, coastal, oceanic, and geophysical data.
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Polar Data CatalogueA primarily Canadian archive of free RADARSAT imagery as well as Arctic, Antarctic, and other cryospheric data sets covering a range of disciplines, from natural sciences and policy to health and social sciences.
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Public Geodata RepositoryData from the Open Source Geospatial Foundation (OSGeo).
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ShareGeo OpenShareGeo Open is a spatial data repository that promotes data sharing between creators and users of spatial data. Geospatial data of all kinds is available.
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NASA Planetary Data System (PDS) DatasetsThe PDS archives and distributes scientific data from NASA planetary missions, astronomical observations, and laboratory measurements.
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NASA Earth DataData for Earth Sciences