The images detail a site known as Sanumdong, where North Korea has assembled some of its intercontinental ballistic missiles and satellite-launching rockets.
The images, taken on 22 February by DigitalGlobe, show rail cars sitting in a nearby rail yard as well as two cranes and trucks.
"When you put all that together, that's really what it looks like when the North Koreans are in the process of building a rocket," Jeffrey Lewis, director of the East Asia Nonproliferation Project at the Middlebury Institute of International Studies at Monterey, told US broadcaster, the National Public Radio (NPR).
JUST IN: North Korea may be preparing to launch a missile or space rocket, based on satellite images shared exclusively with NPR. https://t.co/OllSw7ZYHf