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Revision History
Please note there are two types of revisions that are documented. Revisions involving the NHGIS user interface and revisions that change the data (aggregate or mapping data) that can be retrieved from NHGIS. We will note the type of change in the summary.
March 2008: New 1980, 1990 and 2000 boundary files released -
Using the 1992 TIGER file, the following boundary files were created and released:
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1980 Minor Civil Divisions
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1980 Place
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1980 Block Numbering Areas (Packaged within the census tract files)
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101 and 103 Congressional District
*Please note – due to some data corruption in the original 1992 TIGER file, some areas of the country could not be extracted and released.*
Using the 2000 TIGER-LINE UA file, the following files were created and released:
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1990 and 2000 American Indian area/Alaska Native area/Hawaiian home land
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2000 American Indian Tribal Subdivision
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1990 and 2000 Census Block Groups
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1990 and 2000 Census Blocks
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106 Congressional District
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1990 and 2000 County Subdivision
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1990 and 2000 Places
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2000 Trust Lands
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1990 and 2000 Urban Areas
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1990 and 2000 Voting Districts
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2000 ZIP Code Tabulation Areas (ZCTAs)
April 2007: User interface change - Updated NHGIS site released. The new site revised many of the static documentation areas, but the statistical and mapping extraction tools remained unchanged.
November 2004: Released an internal beta version of the Data Access System to NHGIS collaborators and advisory board members for testing.
December 2004: Released the first public beta version of the Data Access System. The system was released with data from the 1990 Federal Census of Population and Housing, including Summary Tape Files 1, 2, 3 and 4. NHGIS is the first system to make the highly detailed historical data contained in 1990 STF 2 and 4 easily accessible on the web.
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