For a more comprehensive list of public opinion and survey data, visit this guide from Emory's Center for Digital Scholarship.
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A number of digital projects on the open web, visualize and map data in interesting ways. Here's one example from the Mapping Police Violence website.
For more information on police violence go to: MappingPoliceViolence.Org. If you would like to use a digital project, or any source of the open web for that matter, be sure to research its origins and the sources of its data. This is often located on the about page. Here's an example from the The MappingPoliceViolence About Page, which tells you where they get their data from and sites that they avoid.
For a census of digital projects about African American history and politics see Mapping the Black Digital and Public Humanities or this list of Black DH Projects from Black DH scholar Jim Casey.
Published Data Digests and Reports
Websites and Visualizations