Before initiating your download, it is crucial to understand how GADM structures data. Boundaries are broken down hierarchically using numerical layers ( ADM0 through ADM5 ): Download GADM data
This is the most efficient method for most users because global files are extremely large and resource-intensive. GADM Country Download (v3.6)
Features native compatibility with modern open data standards like OGC GeoPackage and classic Esri Shapefiles. Understanding GADM Administrative Coding Levels
The traditional format consisting of a cluster of files ( .shp , .dbf , .shx ). Best for older software versions. KMZ: Ideal for quick visualization in Google Earth. download gadm data version 36 work
For R users, the geodata package provides a dedicated function that scrapes the GADM server directly.
GADM is a high-resolution spatial database of global administrative areas, mapping political subdivisions down to the lowest administrative level. Its goal is to provide a harmonized world coverage of political and administrative areas for all countries, at all levels. Version 3.6, released on May 6, 2018, delimits over 400,000 administrative areas worldwide. It makes use of high spatial resolution images and an extensive set of attributes, offering superior spatial resolution compared to many other free databases.
Smaller localized divisions (Communes, Wards, Parishes—available only for select countries). Before initiating your download, it is crucial to
For programmatic analysis, Python's geopandas library is the standard tool. Version 3.6's GeoPackage format is perfectly compatible.
GADM 3.6 is but has restrictions:
The "by country" method is strongly encouraged. Global datasets can be extremely large and may take a long time to process, whereas country-specific files are optimized for immediate use. For R users, the geodata package provides a
The easiest way to programmatically download GADM v3.6 data is by constructing the direct download URL and handling the HTTP request. The base URL is:
https://geodata.ucdavis.edu/gadm/gadm3.6/shp/gadm36_$COUNTRY_shp.zip
By following these resources and tips, you can unlock the full potential of GADM data version 36 and take your research or analysis to the next level.