The map of the week project in Montréal tracks the July migrations, a curious tradition where many people move to find flats. The creators used data from the Canada Mortgage and Housing Corporation (CMHC) and mapped 10,000 ads in 35 zones to compare average rent prices with CMHC data, highlighting gentrification areas. They built two maps using CartoDB, one displaying average rent prices by number of rooms, and another comparing their data with CMHC data, showing neighbourhoods where new rents are higher than the average. The project also includes a filter function allowing users to compare their situation, and tooltips providing context on each area.