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Richard Marciano, Ph.D. (University of North Carolina, Chapel Hill), David Goldberg, Ph.D. (University of California, Irvine), and Chien-Yi Hou, M.S. (University of North Carolina, Chapel Hill) have made the Testbed for the Redlining Archives of California's Exclusionary Spaces (T-RACES) available online.
The T-RACES project presents the Residential Security Maps created by the Home Owners Loan Corp (HOLC) in the United States between 1935 and 1951. These maps categorized specific areas in cities according to four color-coded categories based on racial and economic desirability of residents and potential home buyers.
The site allows users to view the redline maps, use an interactive demo, see the polygons of various areas, download KML files for use with Google Earth, and run queries on the data. T-RACES has redline maps for Fresno, Los Angeles, Oakland/Berkeley, Sacramento, San Diego, San Francisco, San Jose, and Stockton.