The National Historical Geographic Information System (nhgis)
نویسندگان
چکیده
The National Historical Geographic Information System (NHGIS) is a five-year NSF-funded project designed to create a comprehensive U.S. census databaseat the census tract and county levelfor both the geographical and attribute data. Technological change presents an unprecedented opportunity to make these data readily available for social science research; thus bringing the complete census within reach of social scientists unlocking the potential of two centuries of data collection, and stimulating research in economics, history, sociology, geography and other fields. The project consists of three major components: data and documentation, mapping, and data access. The data and documentation component gathers all extant machine-readable census summary data; fills holes in the surviving machine-readable data through data entry of paper census tabulations; harmonizes the formats and documentation of all files; and produces standardized electronic documentation according to the recently developed Data Documentation Initiative (DDI) specification. The mapping component creates consistent historical electronic boundary files for tracts, counties and larger geographic units. The data access component creates a powerful but user-friendly web-based browser and extraction system, based on the new DDI metadata standard.
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