They've been doing this kind of stuff for years. Everything from counting cars in parking lots (via live satellite) of various retail operations like Target or CMG... to studying the draft and waterlines on oil freighters to see how much they're hauling. Anything for an edge.
@vanzandt beat me to it, but monitoring tanker movements and load levels by satellite has been widely used for years as both a lead indicator of wider economic activity and also for helping to forecast freight rates and thus income for shipping companies.
The other one is counting cranes across city skylines to help with forecasting development activity, and Real Estate Company valuations.