Ghrist, RobertBarishnikov, Yuliy2023-05-222023-05-222009-06-272009-09-17https://repository.upenn.edu/handle/20.500.14332/34791We solve the problem of counting the total number of observable targets (persons, vehicles, etc.) in a region based on local counts performed by sensors which measure only the number of targets nearby and neither their identities nor any positional information. This theory is robust and accommodates ad hoc sensor networks and mobile robot sensors alike.Presentation