Ricardo Dagnino emailed me
months ago! a link to a very inventive research project that uses online images and crowdsourcing to map urban perception. The project is called Place Pulse and it is conducted by Cesar Hidalgo and his colleagues at the MIT Media Lab.
Here is how the research method works and the project webpage . By the way, take one minute to support the project with some clicks.
And here is one paper they published this year:
ps. They have a Video Abstract.