GADM is a spatial database of the location of the world's administrative areas (or adminstrative boundaries) for use in GIS and similar software. Administrative areas in this database are countries and lower level subdivisions such as provinces, departments, bibhag, bundeslander, daerah istimewa, fivondronana, krong, landsvæðun, opština, sous-préfectures, counties, and thana. GADM describes where these administrative areas are (the "spatial features"), and for each area it provides some attributes, such as the name and variant names.
This is an open-source online resource with maps, satellite images, and data on spatial changes in cities around the world, has been revised and updated. The database was developed by a partnership of the Lincoln Institute of Land Policy, UN-Habitat, and New York University.
David Rumsey Historical Map Collection focuses on 18th and 19th century North and South American cartographic materials and includes atlases, globes, school geographies, maritime charts, and a variety of separate maps including pocket, wall, and manuscript maps.
This is one of the world's premier map collections in terms of size, scope, unique holdings, diversity and intensity of use. Established in 1898, holdings include more than 433,000 sheet maps and 20,000 books and atlases published between the 15th and 21st centuries. The collections range from the global to the local scale and support the learning and research needs of a wide variety of users.