Supporting Themes Standards and Specifications

The National Map Supporting Themes Specifications

Supporting themes for The National Map (TNM) include Transportation, Structures, Boundaries, Land Cover, Orthoimagery, and Small Scale datasets.

National Structures Dataset (NSD), Data Model Poster (size 26" x 22", 68 MB)
- Initially posted 2006
- Revised and reposted in July 10, 2019
- Revised and reposted April 15, 2026
National Transportation Dataset (NTD), Data Model Poster (size 36" x 22", 4.5 MB)
- Initially posted 2019
- Revised and reposted April 30, 2020

For comments or questions about any USGS National Geospatial Program Standards and Specifications, please e-mail tnm_help@usgs.gov.