The Australian Strategic Policy Institute (ASPI) is documenting the Chinese government's treatment of Uyghurs and other minorities in the remote northwestern province of Xinjiang. Using open data, satellite images and Chinese government documents they have created an interactive map detailing detention centers (a diplomatic term) as well as showing attempts to erase local culture by destroying mosques and cultural sites.
Here is a detail from the capital region of Urumqi with the legend included.
Clicking on a site brings up details. In this case the growth of a prison where forced labor and "reeducation" are practiced is documented by the number of buildings increasing from 15 in 2017 to 28 the following year.
For more on these detention centers there is a scrollable exploration on the web page.