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Because of land reclamation, South Korea's western coastline changes regularly and data is regularly outdated. For example, GADM shapefiles describe boundaries prior to the development of Songdo.

How can I keep up-to-date with South Korea level-1 administrative boundaries (provinces and special cities, in the form of shape files or equivalent like the "R sf" (.rds) format supplied by GADM)?

I've updated the reference to GADM from v2 to v3 but the v3 Korea admin 1 file has the same issues I detected in v2 so it may not have been updated.

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    Well, how do you do it currently?
    – Erik
    May 12, 2020 at 10:52
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    I'm using GADM for lack of a better alternative. I can see some changes in Google's base map but they are not reflected in the admin boundaries. I've found another more up-to-date source in Korea's NSDI but it has other problems (which I'm trying but not sure I can solve). So I'm open to suggestions.
    – syre
    May 12, 2020 at 10:57
  • It's best that you contact Songdo International Business District or the Incheon Province that if they have the latest current shapefiles you need.
    – PROBERT
    May 12, 2020 at 13:47
  • This is from the University of Michigan GIS that has the Korea GiS data....not sure what you are looking for guides.lib.umich.edu/c.php?g=283110&p=1886160
    – PROBERT
    May 12, 2020 at 14:17
  • @PROBERT The UoM links to the GADM data.
    – syre
    May 13, 2020 at 2:12

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