I haven't used PROBA imagery, but many colleagues in Europe rely on this sensor.
PROBA-V (i.e. "vegetation") was launched May 7. The miniature satellite is designed to map land cover and vegetation growth across the entire planet every two days. The data can be used for alerting authorities to crop failures or monitoring the spread of deserts and deforestation.
Less than a cubic metre in volume, Proba-V is a miniaturised ESA satellite tasked with a full-scale mission: to map land cover and vegetation growth across the entire planet every two days.
Proba-V is flying a lighter but fully functional redesign of the Vegetation imaging instruments previously flown aboard France’s full-sized Spot-4 and Spot-5 satellites, which have been observing Earth since 1998.