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Before May 2018, researchers were in a bind. GADM version 3.4 had been released with a significant flaw: the internal ID codes (GIDs) were inconsistent, making it nearly impossible for scientists to "join" their data (like population or disease stats) to the correct map areas without manual errors.
From version 3.6 onwards, GID codes are persistent, making them more reliable for long-term projects than older versions. Resolution: Typically around 10m resolution. ISO 3166-1 alpha-3 code for a specific country to use in your scripts? Download GADM data (version 3.6) download gadm data version 36 work