Disclaimer: GIS data sites move. If a site link is inactive, try searching with keywords.
Open data = data that can be freely used, re-used and redistributed by anyone
Note: not all free data are open
- Esri data housed at Wesleyan (dragon/apps/ESRI Data and Maps/)
- Esri open data portal and Living Atlas portal
- Connecticut DEEP data
- UConn MAGIC
- CT ECO
- UConn CLEAR
- City of Middletown (CT) data portal and interactive GIS data site and older data site
- City of Middletown 1951 aerial photos
- US geospatial data repository
- US Census (To request a free data workshop, training, or presentation from the U.S. Census Bureau, please contact the Data Dissemination Office at census.askdata@census.gov or 1-844-ASK-DATA (1-844-275-3282).)
- List of geospatial data portals
- Western CT Council of Governments data
- Institute for Health Metrics and Evaluation global disease data
- New York City tax lot data (PLUTO) and geographic base map files
- David Rumsey historical map collection
- British Library collection of online georeferenced maps
- National Historical Geographic Information System, free census data and compatible GIS boundary files for the United States between 1790 and 2012
- Middletown Biodiversity Database
- Connecticut Sanborn Maps
- Puerto Rico GIS data portal
- Downloadable 250m soils data for Africa
- GeoCommunity
- Diva GIS
- Free GIS data
- Geocommons
- The Geospatial Platform: a repository of spatial data created and managed by US federal agencies
- Climate Data:
- US data related to climate change from climate.gov
- WorldClim
- NCAR’s Community Climate System Model
- GIS Resources list
- NASA GISS Surface Temperature Analysis
- NWS Climate Prediction Center
- NOAA Climate Data Online
- USGS North America Climate (derived from WorldClim)
- Ecological Land Units data and maps (USGS & Esri)
- Ecological Marine Units
- iDigBio
- Many US universities have data repositories or portals
- List of 10 free data sources
- The US Government open data site is Data.gov. Some local data is also included.
- CT Transit data: GTFS data and plug in or shapefile
- National Map
- Esri geographic data portal, ArcGIS Living Atlas of the World
- EPA data (also search the EPA archive)
- USGS Water Resources
- OpenStreetMap, which provides open data: you are free to use it for any purpose as long as you credit OpenStreetMap and its contributors.
- Free GIS Data and Imagery Geoblog: http://gisdata.blogspot.com/index.html
- Environmental Dataset Gateway
- American Indian/Alaska Native Areas/Hawaiian Home Lands
- J. Kerski’s list of Top 10 GIS Data Portals
- Biodiversity data:
- https://www.gbif.org/
- Western Association of Fish and Wildlife Agency’s Crucial Habitat Assessment Tool data, http://www.wafwachat.org/pages/west-wide-chat
- http://aseanbiodiversity.org
- Bay Area Conservation Lands Network
- Nature’s Network (for the Northeast US)
- Landscape Project (New Jersey)
- Gap Species Richness (McKerrow et al., 2018), https://doi.org/10.1111/ddi.12779
- Biodiversity Priority (Jenkins et al., 2015), https://doi.org/10.1073/pnas.1418034112
- Ecosystem Representation (Aycrigg et al., 2014), https://doi.org/10.5849/jof.15-050
- iNaturalist
- Plantsnap
- Global Biodiversity Information Facility (GBIF)
- InfoAmazonia – open GIS data sets for Amazon region
- Amazonia Socioambiental – georeferenced socio-environmental data
- Ordnance Survey OpenData from Great Britain basemap collection
- Baltic Sea maritime spatial planning relevant data
- Open-source maps from OpenMapTiles.org
- OpenContext.org, open research data
- Data.gov Ocean, data, information, and decision tools related to oceans, coasts, and Great Lakes
- GIS resources in marine sciences (Stanford Library)
- Global impact crater GIS database
- GPS waypoints for U.S. POIs
- An interactive map to access open data portals across the world
- GIS data for Mexico