Optimized Spatial Census Information Linked Across Time (OSCILAT)

The principal "OSCILAT" resource is optimized georeferencing information for 1990, 2000, and 2010 decennial census microdata. This information is "optimized" by retroactively applying the most recent and accurate information on address locations to earlier census data. The data used to accomplish this was the 2000-2020 MAFX files and decennial microdata as well as the 1990 address control file. The georeferencing information includes longitude/latitude coordinates for every housing unit and person record in the 1990, 2000, and 2010 censuses as well as 2010 and 2020 block IDs for every record from the 1990-2010 censuses.OSCILAT also includes documentation, source code, and a set of geographically standardized census tract data, describing some 1990 and 2000 characteristics of 2010 census tracts, based on the optimized georeferencing information.