The TNM Download website is hosted by the US Geological Survey (USGS). It’s the successor to The National Map Viewer. It provides FTP access to a large number of important national-level datasets.
- Topographic maps • National Boundary Dataset
- National Hydrography Dataset (NHD)
- 3D Elevation Program • Map Indices
- Watershed Bounday Dataset (WBD)
- National Agriculture Imagery Program (NAIP)
- Geographic Names Information System (GNIS)
- National Land Cover Database (NLCD)
- Small-scale Boundaries, Contours and Elevation
- National Structures, Transportation Datasets
Download portal URL: https://viewer.nationalmap.gov/basic/
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