Note that downloaded spatial data comes in many different forms and may require extraction or conversion with a special utility before you can use it in a map.
Click here for information on converting vector ArcInfo interchange files with the file extension e00 to coverage format which will be recognized by ArcGIS, ArcView, Arc Explorer, and other GIS software.
Jump to... State & Local ~ Commercial ~ US Gov't ~ Canadian Gov't ~ Academic... geospatial data sources.
State & Local Data Sources ~ back to top
Massachusetts GIS. In addition to comprehensive data for the State of Massachusetts, this site includes several data sets which are useful for other New England GIS users, including images of NOAA nautical charts and political boundary layers for all New England towns and the Atlantic Provinces. http://www.state.ma.us/mgis/massgis.htm
New Hampshire GRANIT. The New Hampshire Geographically Referenced Analysis and Information Transfer System (NH GRANIT) is a cooperative project to create, maintain, and make available a statewide geographic data base serving the information needs of state, regional, and local decision-makers. http://www.granit.sr.unh.edu/cgi-bin/load_file?PATH=//home.html
Commercial Data Sources ~ back to top
U.S. Government Data Sources ~ back to topU.S. Geological Survey (USGS)
U.S. National Atlas. http://www.nationalatlas.gov/pros.html Downloadable map layers for the entire U.S. in these categories: Agriculture, Environment, People, Biology, Geology, Transportation, Boundaries, History, Water, Climate, Map Reference.U.S. CensusTIGER files (Topologically Integrated Geographic Encoding and Referencing) http://www.census.gov/geo/www/tiger/index.htmlU.S. National Oceanic & Atmospheric Administration (NOAA)
NOAA Coast Watch Product Search Page offers access to multiple sources of remotely sensed datasets. http://coastwatch.noaa.gov/interface/interface.html
National Aeronautics & Space Administration (NASA)
Canadian Government Data Source ~ back to topAcademic Data Sources ~ back to top
Stanford University Library GIS Data Bookmarks. A comprehensive list of links to GIS data worldwide. http://www-sul.stanford.edu/depts/gis/bookmark.htm
Guide to Mostly On-Line and Mostly Free U.S. Geospatial and Attribute Data. This site may be overwhelming at first, but it has lots of data sources that you might not be able to find otherwise. Perhaps most useful are the links to lots of different sources of ATTRIBUTE DATA! Prepared by Stephan Pollard at the University of Arkansas, this site is often updated. http://libinfo.uark.edu/GIS/us.aspInternational Ocean Color Coordinating Group offers links to many ocean color datasets http://www.ioccg.org/data_ioccg.htm