Global Data

• USGS EarthExplorer
• USGS Landcover Institute
• ESA Climate Change Initiative Open Data Portal
• Global Landcover Facility
• CGIAR-CSI
• Global Map
• Natural Earth
• Natural Earth Starter Kit
• GRASS-Wiki List of Global Datasets
• Open Street Map Extracts from Geofabrik
• Open Street Map Extracts from Open Map Tiles

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Elevation Data

• National Map Viewer
• National Map Small-Scale Data
• US Interagency Elevation Inventory
• Open Topography
• NASADEM
• ALOS Global Digital Surface Model
• MERIT DEM
• EU-DEM
• UK Open Data Lidar
• swissSURFACE3D

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Web Mapping Services (WMS)

• National Map Small-Scale Data WMS
• USGS Imagery WMS
• USGS NAIP Imagery WMS
• r.in.usgs for GRASS GIS

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Ecological Data

• USGS GAP Analysis Program
• Landfire
• Bison Biodiversity Data
• NEON
• Protected Planet
• IUCN Red List
• Anthromes
• WWF Conservation Science Datasets
• Map of Life
• USGS Global Ecosystems + Viewer
• EarthEnv
• OpenLandMap

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Soil Data

• USDA Soil Survey
• European Soil Data Centre Datasets

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US Datasets

• USGS National Elevation Dataset (NED)
• USGS National Landcover Dataset (NLCD)
• USGS National Hydrography Dataset (NHD)
• USGS National Transportation Dataset (NTD)
• USGS National Boundary Dataset (NBD)
• National Agriculture Imagery Program (NAIP)
• USFWS National Wetlands Inventory (NWI)
• FEMA National Flood Hazard Layer (NFHL)
• Protected Areas Database of the United States (PAD-US)
• Modeled Historical Land Use and Land Cover for the Conterminous United States: 1938-1992
• U.S. Conterminous Wall-to-Wall Anthropogenic Land Use Trends: 1974–2012 (NWALT)
• US Commutes and Megaregions

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US Coastal Data

• NOAA Digital Coast Data Viewer
• NOAA Digital Coast Data Registry
• NOAA Coastal Change and Analysis Program
• NOAA Digital Coast Sea Level Rise
• NOAA Historical Hurricane Tracks
• NOAA Coastal Flood Exposure Mapper
• Marine Cadastre National Viewer

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European Data

• Copernicus Pan-European Data
• European Environment Agency

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UK Data

• UK Open Data
• Populated Places of Great Britain
• Buildings of Great Britain

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New York Data

• NYC Open Data
• New York State GIS Clearinghouse
• Discover GIS Data NY

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North Carolina Data

• NC Spatial Data Download
• State Climate Office of North Carolina

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Louisiana Data

• Louisiana Atlas