Method for determining data representative of a movement of a communication terminal, called a particle, within a predetermined geographical area, called an area to be mapped, the method comprising: - a phase for obtaining data representative of transmission powers of at least one data transmission signal within said area to be mapped, delivering a set of captured data, said obtaining phase comprising a step of temporal synchronisation of at least one sensor of an array comprising at least two data transmission signal sensors, comprising: ∘ a step of obtaining data triplets from at least one communication terminal, for each of the two sensors, a triplet comprising a particle identifier, a capture time and a reception power; ∘ a step of constructing a temporal matrix comprising, for each coefficient, a difference between the capture times of each triplet by the two sensors; ∘ a step of identifying, among the coefficients of said matrix, a probable deviation corresponding to coefficients of the matrix occurring most frequently, said probable deviation being used to temporally synchronise the measurements of one of the two sensors, - a phase for filtering the data of said set of captured data as a function of at least one predetermined filtering parameter, delivering a set of filtered data; - a phase for using said set of filtered data to compute data representative of at least one movement made by said particle within said area to be mapped. - a phase for obtaining data representative of transmission powers of at least one data transmission signal within said area to be mapped, delivering a set of captured data, said obtaining phase comprising a step of temporal synchronisation of at least one sensor of an array comprising at least two data transmission signal sensors, comprising: ∘ a step of obtaining data triplets from at least one communication terminal, for each of the two sensors, a triplet comprising a particle identifier, a capture time and a reception power; ∘ a step of constructing a temporal matrix comprising, for each coefficient, a difference between the capture times of each triplet by the two sensors; ∘ a step of identifying, among the coefficients of said matrix, a probable deviation corresponding to coefficients of the matrix occurring most frequently, said probable deviation being used to temporally synchronise the measurements of one of the two sensors, ∘ a step of obtaining data triplets from at least one communication terminal, for each of the two sensors, a triplet comprising a particle identifier, a capture time and a reception power; ∘ a step of constructing a temporal matrix comprising, for each coefficient, a difference between the capture times of each triplet by the two sensors; ∘ a step of identifying, among the coefficients of said matrix, a probable deviation corresponding to coefficients of the matrix occurring most frequently, said probable deviation being used to temporally synchronise the measurements of one of the two sensors, - a phase for filtering the data of said set of captured data as a function of at least one predetermined filtering parameter, delivering a set of filtered data; - a phase for using said set of filtered data to compute data representative of at least one movement made by said particle within said area to be mapped.