> so you know how many unique users are in that area would you like to know more? see also: https://www.jstor.org/stable/27862533 https://www.jstor.org/stable

> so you know how many unique users are in that area would you like to know more? see also: https://www.jstor.org/stable/27862533 https://www.jstor.org/stable/27862533 Baryshnikov & Ghrist, Target Enumeration Via Euler Characteristic Integrals (2009) > We solve the problem of counting the total number of observable targets (e.g., persons, vehicles, landmarks) in a region using local counts performed by a network of sensors, each of which measures the number of targets nearby but neither their identities nor any positional information. We formulate and solve several such problems based on the types of sensors and mobility of the targets.