The visual is interesting, and I would love to hear more about the archive that it seems to come from. At this point it is not yet clear what the ethnographic purchase of the image is -- but it could easily become relevant. Are there any other images that you could juxtapose/contrast it with?
You could take a look at Danica's caption and visual of federal land ownership in the US -- what kind of sentiments are usually linked to the map that you are showing us here? How do people deploy the map? What are its particular blindspots and simplifications?
The visualization aims to show how maps, especially those used in the context of urban policymaking, are politicizing certain kinds of aesthetics about how the city should look. There are conflicting meanings of what is public use and the definitions of blight, which index social and political dimensions of how urban life is spatially located. How might you visualize these two arguments in the image? Could you perhaps show an X and Y axis of demographics of these areas which are classified as blight ?