Arctic-Focused
- ARCSS Data Coordination Center – Data repository for NSF-funded Arctic System Science (ARCSS) data; several GIS data layers available
- Geographic Information Network of Alaska (GINA) – Access data held or indexed by GINA through an Internet Map Server, searchable metadata catalog, or map gallery
- International Bathymetric Chart of the Arctic Ocean (IBCAO) – Download the IBCAO Grid bathymetric map data for the Arctic Ocean
- National Snow and Ice Data Center – Cryospheric data for the polar regions; several GIS data layers available from various data providers; search or browse for data
Global
- Earth System Atlas – Download global-extent data layers; multi-agency mapping initiative led by International Geosphere-Biosphere Programme (IGBP)
- European Space Agency (ESA) Satellite Imagery – Earth observation satellite images from the ESA
- FGDC National Spatial Data Clearinghouse – Search collection of over 200 local, national, and international spatial data servers for links to geospatial data
- Land Processes Distributed Active Archive Center – NASA/USGS site providing global data collected by various satellite and aerial sensors
- UNEP.Net GEO Data Portal – United Nations Environment Network data portal. Display selected data as maps or graphs, or download datasets, including GIS coverages
National
- Canadian Geospatial Data Infrastructure/GeoConnections – Search or browse for geospatial data for Canada
- Land Resources of Russia – Online version of CD-ROM providing comprehensive data on the land characteristics of Russia; download GIS coverages
- NSDI Geospatial One-Stop – U.S. National Spatial Data Infrastructure (NSDI) portal to geospatial data; links to state, regional and local government clearinghouses
- USDA National Cartography and Geospatial Center (NCGC) – USDA Natural Resources Conservation Service data access, internet mapping, geospatial data gateway
- USGS National Mapping Information – U.S. Geological Survey's Geography site, with links to geospatial data; primarily national extent
Regional/State
- Alaska Geospatial Data Clearinghouse – Alaska GIS clearinghouse site, with links to a variety of AK-wide datasets, including base maps and ecological datasets
- Alaska Sea Ice Atlas – GIS-based Alaska Sea Ice Atlas of sea ice conditions in the territorial waters of Alaska
- Quaternary GIS Laboratory – Several GIS layers available for download related to Alaska and Beringia