| Problem | Solution | |---------|----------| | Download fails | Use a download manager or mirror link | | File corrupt | Check file size against website; re-download | | Encoding issues in names | Use encoding='utf-8' in reading functions | | Memory errors | Load country-level data, not world file |

GADM data is available at https://gadm.org . However, the site defaults to the latest version (currently v4.1+). To get version 3.6 specifically:

Recommended for smaller file sizes and targeted research.

GADM (Global Administrative Areas) version 3.6 is a spatial database of the world's administrative boundaries released on May 6, 2018. While the current official version is 4.1, version 3.6 remains available for download through the GADM Old Versions page and is widely used for GIS mapping and spatial analysis. Download Options for Version 3.6 Users can download the data in two primary ways: By Country (Recommended)

| Problem | Solution | |---------|----------| | .prj missing, coordinate system unknown | Manually set CRS to EPSG:4326 (WGS84). | | Attribute text looks garbled (e.g., “Côte”) | Encoding issue. Open Shapefile with UTF-8 or use .cpg file. In QGIS, set “Data source encoding” to UTF-8. | | Multiple files for Level 0, 1, 2 – which one to use? | Use gadm36_COUNTRYCODE_0.shp for borders, _1 for states, _2 for districts. GeoPackage contains all layers. | | Cannot dissolve internal boundaries (e.g., show only country outline) | Use on Level 1 features, or simply re-load Level 0. | | File size too big for memory | Use GeoPackage with spatial indexing, or filter by attribute before loading. |