Supporting Themes

By NGP Standards and Specifications

The National Map Supporting Themes Specifications

Transportation, Structures, Boundaries, Land Cover, Orthoimagery and Small Scale Datasets

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

Browse the links below for specification information.

Quick Links:

Spec-X Specification Explorer Database

National Structures Dataset (NSD), Data Model Poster (plot size 26" x 22", 164 KB)
- Initially posted 2006, revised and reposted July 10, 2019

National Transportation Dataset (NTD), Data Model Poster (plot 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.