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| National Historical GIS Project | |
|---|---|
| Name | National Historical GIS Project |
| Abbreviation | NHGIS Project |
| Established | 1990s |
| Location | United States |
| Focus | Historical geographic information systems, historical data integration, spatial humanities |
National Historical GIS Project The National Historical GIS Project is a scholarly initiative that develops geospatial datasets and tools for historical research and teaching, integrating census data, cartographic resources, and spatial analysis. Founded to support digital humanities, historical demography, and spatial history studies, the Project has enabled comparative analysis across time by producing harmonized boundary files, population counts, and attribute tables for use with geographic information systems. It serves researchers at universities, cultural institutions, and government archives, and interfaces with projects focusing on urban history, migration, and electoral geography.
The Project produces interoperable historical spatial data and documentation to support quantitative history, digital history, and historical demography. It aggregates source materials from the United States Census Bureau, the Library of Congress, the National Archives and Records Administration, and state historical societies such as the Massachusetts Historical Society and the New York Historical Society. Outputs are widely used by scholars associated with institutions such as Harvard University, Yale University, University of Minnesota, Stanford University, and the University of California, Berkeley. The Project’s data underpin studies that appear in journals like the Journal of American History, American Historical Review, Social Science History, Demography, and Historical Methods.
Origins trace to collaboration among historians, geographers, and demographers in the 1990s, influenced by methodological innovations at centers including the Institute for Historical Research, the Minnesota Population Center, and the Harvard Geospatial Library. Early work intersected with initiatives such as the National Historical Geospatial Data Infrastructure and projects funded by the National Endowment for the Humanities, the National Science Foundation, and private foundations like the Andrew W. Mellon Foundation. Key personnel have collaborated with scholars from the American Historical Association, the Royal Geographical Society, and university departments of history, geography, and sociology. The Project evolved alongside technological advances exemplified by the release of commercial software from ESRI and open-source efforts like the QGIS community.
The Project compiles decennial census counts, administrative boundary shapefiles, and metadata using methods developed in collaboration with demographers at the Institute for Population Research and cartographers at the David Rumsey Map Collection. It harmonizes spatial units across censuses through tokenization and reconciliation protocols influenced by standards from the Open Geospatial Consortium and archival best practices from the Society of American Archivists. Source reconciliation often references gazetteers such as the US Board on Geographic Names and historical atlases like works by Rand McNally and Fry-Atlas. Methodological documentation draws on statistical approaches popularized by researchers at the National Bureau of Economic Research and computational techniques from the Association for Computational Linguistics for place-name matching.
Major outputs include time-series tables of population, race, occupation, and housing variables harmonized to consistent geographic units, alongside boundary files for counties, townships, and municipalities. Coverage emphasizes the United States from early nineteenth-century censuses through modern enumerations, with particular granularity for states such as New York (state), Massachusetts, Pennsylvania, Ohio, and Illinois. The Project interoperates with complementary datasets like the American Community Survey for contemporary comparisons and historical maps from the Perry–Castañeda Library Map Collection. Specialized subsets support research on topics involving the Great Migration, Civil War, Reconstruction Era, and westward expansion associated with treaties such as the Treaty of Guadalupe Hidalgo.
Researchers use Project data to study urbanization patterns in cities like New York City, Chicago, and Philadelphia; migration flows including the Dust Bowl exodus; electoral studies concerning the United States presidential election, 1860 and the Reconstruction Amendments era; and public-health histories such as analyses of the 1918 influenza pandemic. Scholars affiliated with centers like the Social Science History Association, the Economic History Association, and the Population Association of America employ the data for longitudinal analysis, machine-learning-assisted classification, and spatial econometrics in publications and dissertations. Educators at institutions such as Columbia University, Princeton University, and University of Michigan integrate datasets into undergraduate and graduate seminars.
The Project supports data distribution in formats compatible with ArcGIS, QGIS, and statistical environments like R (programming language) and Python (programming language), leveraging libraries such as GDAL, PostGIS, and GeoServer. Web dissemination uses mapping frameworks influenced by Leaflet (JavaScript library) and standards from the World Wide Web Consortium. Version control and collaboration draw on platforms exemplified by GitHub and institutional repositories at universities including University of Minnesota Library. Visualization outputs have been showcased in digital exhibits hosted by the Smithsonian Institution and the Digital Public Library of America.
The Project has partnered with academic centers such as the Minnesota Population Center, the Center for Geographic Analysis at Harvard University, and state archives including the New York State Archives. Funding sources include grants from the National Science Foundation, the National Endowment for the Humanities, the Andrew W. Mellon Foundation, and cooperative agreements with the United States Census Bureau. Collaborative research networks encompass the Digital Humanities Summer Institute, the International Council on Archives, and professional societies like the American Association of Geographers, enabling workshops, data curation training, and shared infrastructure development.
Category:Historical GIS Category:Digital humanities Category:Geographic information systems