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International audienceThis paper describes the survey method built to carry out the UGM survey in the Paris region. The size of the city, around 12 million inhabitants spread over a territory of 12,000 km2, and the cost constraints led us to design a specific sampling methodology based on a typology of the 1,300 Parisian municipalities. Thus it was possible to capture all the movements and main logistical behavior of the city by surveying only 1,200 establishments