While this is just another example for how drones might add value, I think the more important use on a port would be for general observation during security events or accidents. Ports don't have aircraft like planes or helicopters, so aerial observation is a luxury in today's security environment. Back when I was a director of security for the Port of Tacoma, I sought to use Port Security Grant Program funds to purchase a drone. There was no interest to do so from port management.
My point was that a drone could also be used for marketing the port's business interests by showcasing properties, routes, etc. Still — no interest.
Several years ago, I attended a Northwest Ports meeting and I asked the question, "Does anyone have a drone?" Surprisingly, a number of small ports raised their hands. They were using the drones for marketing purposes. It just goes to show that you don't have to be big to be innovative.