GIS Data and Maps

1893-present. Historical weather data for several dozen Iowa locations.

Downloadable spatial data from Iowa government agencies, primarily the Department of Natural Resources.

Harmonized base layers of Canada, Mexico, and the U.S., as well as layers of environmental data, from the Commission for Environmental Cooperation.

Agricultural and environmental data for the U.S. From the National Resources Conservation Service at the U.S. Department of Agriculture.

A combination of the former National Geophysical Data Center (NGDC) and National Climactic Data Center (NCDC). Maintained by the National Oceanic and Atmospheric Administration (NOAA). Includes bathymetry and other marine data, natural hazards, geomagnetic data, and historical climate and weather data.

Spatial data on mineral resources from the USGS.

Data from UNEP's Global Environment Outlook (GEO) report, as well as other environmental and socioeconomic data.

GIS layers for climate data, with a resolution of one square kilometer.

Over 25,000 data sets on the environment and Earth science, curated by NASA's Goddard Space Flight Center.

Excellent source for data and GIS layers on global development issues.

A global database of information related to agriculture, including land use, forestry, fisheries, and much more. Created by the UN's Food and Agriculture Organization (FAO). Data can be mapped online or downloaded for use in desktop GIS programs.