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: Traditional format compatible with almost all GIS software. KMZ (.kmz) : Ideal for viewing in Google Earth. : Specialized format for use with R programming. 2. Administrative Levels GADM data is structured into hierarchical levels: : National boundaries (Country level). : Primary subdivisions (e.g., States, Provinces). : Secondary subdivisions (e.g., Districts, Counties). Level 3 & Higher

. Note that these are very large files and may take significant time to download. Available Data Formats

The database is a high-resolution spatial database of the world's administrative boundaries. While newer versions like 4.1 are available, Version 3.6 remains a widely used benchmark in academic research and GIS workflows due to its stability and compatibility with older datasets. Where to Download GADM 3.6

To access Version 3.6, you must navigate to the page. From there, you have two primary options for obtaining the data:

# If you downloaded the .gpkg file # You can specify the layer (0 = Country, 1 = Province, etc.) country_shape <- st_read("gadm36_COUNTRYCODE.gpkg", layer = "ADM_0") province_shape <- st_read("gadm36_COUNTRYCODE.gpkg", layer = "ADM_1")