GIS: Major Resources

January 11, 2017

Natural Earth

A source for free geospatial datasets covering the entire globe at small, large, and medium scales. Includes a variety of cultural and natural features as well as elevation and bathymetric basemaps.

January 11, 2017

The National Map

The United States Geological Survey’s (USGS) geospatial data and maps website. Access to geospatial datasets for hydrography, elevation, wetlands and many other natural and cultural features. For an interactive map for finding data see the National Map Viewer.

November 25, 2013

U.S. Census Maps and GIS Data

Digital maps covering a variety of US Census demographic categories, plus GIS data in vector boundary files for spatial aggregations of tabular census data at all levels of the census hierarchy.

November 26, 2012

National Historical Geographic Information System (NHGIS)

NHGIS is a data portal for U.S. Census data in both tabular and geospatial formats. It provides access to summary statistics and GIS boundary files for population and agricultural censuses and other nationwide surveys from 1790 through the present. Alternatively, for a user-friendly online mapping interface connected to this same data see Social Explorer.

May 9, 2012

Social Explorer

Online application for locating and mapping US Census data and other demographic resources. Maps created on Social Explorer can be exported as images. To download the data itself in tabular and GIS formats see National Historical Geographic Information System (NHGIS).

August 15, 2008

PA Spatial Data Access (PASDA)

PASDA is a portal for geospatial data from a variety of state government agencies. Use the Pennsylvania Atlas for a map interface for previewing and downloading GIS datasets. Use Imagery Navigator for access to aerial photography from 1996-present.

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