You've just tossed a jar of peanut butter in your grocery cart when your smart-phone buzzes. You glance at the screen to see a message that seems downright clairvoyant: Buy some jelly. Get $1 off. Convenient? Certainly. Creepy? Maybe. This is one vision for indoor positioning, a fast-evolving technology that is allowing retailers to track shoppers' physical movements along their aisles in unprecedented detail. In many big-box stores, equipment is already in place to sniff out customers' smartphones and log data such as how many minutes a person spends in the shoe department.
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