The Satellite Sentinel Project of Enough published a report in June 2013 titled "Troops in the Demilitarized Zone: Confirmation of Violations by Sudan and South Sudan."
The report, which includes imagery, concludes that the Sudan People's Liberation Army (SPLA) maintains military installations or checkpoints in at least nine locations along the border, while the Sudan Armed Forces (SAF) have positions in at least five locations along the border, some with visible tanks and heavy artillery.