Planning a drone patrol to minimize worst-case data age is NP-complete, and two Christofides-based algorithms achieve a 1.5 approximation for this objective.
Age of information: A new metric for information freshness,
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Optimizing Age-of-Information in Piggyback Networks with Recurrent Data Generation
Planning a drone patrol to minimize worst-case data age is NP-complete, and two Christofides-based algorithms achieve a 1.5 approximation for this objective.