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The sensing systems that monitor physical environments rely on communication infrastructures (wired or wireless) to collect data from the sensors embedded in the environment. However, in many urban environments pre-existing communication infrastructures are not available, and installing and using new infrastructures is unjustifiably expensive and/or technically infeasible. For such environments, we envision Participatory Data Transfer (PDT ) as an alternative communication medium that leveragesdoi:10.1145/1867699.1867708 dblp:conf/gis/Shirani-MehrKS10 fatcat:deutyqw7srdhfnjrdfpfctlrsa