Unlocking High-Quality Boundaries: A Guide to GADM Version 3.6 While newer versions of the Global Administrative Areas (GADM)
It started, as most GIS projects do, with a deadline and a blank map. I needed the most detailed administrative boundaries available for a project focusing on rural development in Southeast Asia. I didn't just need country outlines; I needed the deep cuts—districts, municipalities, the level 2 and level 3 boundaries that make a map truly useful.
| Column | Description | |--------------|--------------------------------------| | GID_0 | Country ISO3 code | | NAME_0 | Country name | | GID_1 | Unique ID for level 1 region | | NAME_1 | Region name (state/province) | | VARNAME_1 | Alternate names (often empty) | | TYPE_1 | Administrative type (e.g., “State”) | | ENGTYPE_1 | English type | | CC_1 | Country code again (redundant) |