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Basemap Data and Broad Collections
- VMAP Level 0 (formerly known as Digital Chart of the World)
From the US National Geospatial-Intelligence Agency (NGA), providing about the level of detail found on 1:1,000,000 charts. Worldwide layers are divided into 4 parts as below. The files are tarred and gzipped.
These are in Vector Product Format (VPF); ArcGIS has an Import from VPF tool in its Coverage Toolbox.
- The "GIS-Lab" site has VMAP0 files in shapefile format, as well as VMAP1 files (based on 1:250,000 charts) for some areas.
- Vmap is the source of many free layers at sites such as DIVA-GIS.
Topical Geospatial Data
Climate, Environment, Human Impact
- Renewable Energy Data Explorer (REexplorer) Online mapping tool for visualizing energy-related map layers from selected non-US countries, most of which can be downloaded as GIS files.
Geology and Soils