"Following the Korean War, the Spatial Data Industry Promotion Act and the Promotion of Military Bases and Installations Act were put in place to bar the export of map data outside the country. This is presumably to prevent sensitive information from falling into the wrong hands, especially given the hostility from north of the DMZ. Inevitably, however, ...
The data is from 2012.
Google stores its maps on foreign servers and therefore has not been
allowed access to South Korea’s map data. In 2016, South Korean
officials offered to hand their country’s map data over to Google
under the condition that the tech company reduce map resolutions for
important landmarks like military outposts and government offices.