Mapping Census Data (Previous page)

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Amanda C. Henley
GIS Librarian
Davis Library

CensusCD Neighborhood Change Database (NCDB) Long Form from GeoLytics. Available from Davis Reference Data Services, in CD cabinet number 5 organized alphabetically by title. This product simplifies the comparison by providing 1970, 1980, and 1990 data in 2000 tract boundaries, and normalizes the data so that the variables between the four censuses are comparable, even though the questions- or the ways in which respondents were instructed to answer the questions- changed between the two censuses. Data can be exported in dbf format or shapefile format. GeoLytics Products are installed on E-Docs machines 1, 2, and 3. See our Guide to Using GeoLytics Census CD-Rom Products. For more information, see the variable list and Data User's Guide on the GeoLytics Website.

Important: Although this product is very useful because the changing boundaries between censuses are taken into account, it does not take into account the fact that the entire nation was not divided into tracts for all census years. If the geographic area of interest was not divided into tracts for the selected date, the program will return a value of 0(!). Always use caution when comparing censuses. Read Some words of caution for those who wish to make comparisons between censuses. Additional information is available in the product's documentation, linked to above and provided on the product CD-ROM.