In April 2013 Planet Labs launched two demonstration satellites, “Dove 1” and “Dove 2”. Yesterday two more satellites Dove 3 and Dove 4 were placed into orbit by a Dnepr rocket.
It appears the Dove-3 and 4 mission is a technology demonstration. They will operate from longer lived sun synchronous orbits. Both satellites are licensed to collect images of the Earth and will undertake an experimental mission in an 800 km by 597 km and a 700 km circular orbit, respectively. Dove 3 conforms to the 3U cubesat specification, with a launch mass of 5.2 kg. Basic physical dimensions are 100 mm × 100 mm × 340 mm, with two 260 mm × 300 mm deployable solar arrays. Power storage is provided by Lithium-Ion cells. The batteries will be recharged by solar cells mounted on the body of the satellite and on the two deployable solar panels.