Description: The Military Bases dataset was last updated on November 11, 2025 and are defined by Fiscal Year 2024 data, from the Office of the Assistant Secretary of Defense for Energy, Installations, and Environment and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). The dataset depicts the authoritative locations of the most commonly known Department of Defense (DoD) sites, installations, ranges, and training areas world-wide. These sites encompass land which is federally owned or otherwise managed. This dataset was created from source data provided by the four Military Service Component headquarters and was compiled by the Defense Installation Spatial Data Infrastructure (DISDI) Program within the Office of the Assistant Secretary of Defense for Energy, Installations, and Environment. Only sites reported in the BSR or released in a map supplementing the Foreign Investment Risk Review Modernization Act of 2018 (FIRRMA) Real Estate Regulation (31 CFR Part 802) were considered for inclusion. This list does not necessarily represent a comprehensive collection of all Department of Defense facilities. For inventory purposes, installations are comprised of sites, where a site is defined as a specific geographic location of federally owned or managed land and is assigned to military installation. DoD installations are commonly referred to as a base, camp, post, station, yard, center, homeport facility for any ship, or other activity under the jurisdiction, custody, control of the DoD.
While every attempt has been made to provide the best available data quality, this data set is intended for use at mapping scales between 1:50,000 and 1:3,000,000. For this reason, boundaries in this data set may not perfectly align with DoD site boundaries depicted in other federal data sources. Maps produced at a scale of 1:50,000 or smaller which otherwise comply with National Map Accuracy Standards, will remain compliant when this data is incorporated. Boundary data is most suitable for larger scale maps; point locations are better suited for mapping scales between 1:250,000 and 1:3,000,000.
If a site is part of a Joint Base (effective/designated on 1 October, 2010) as established under the 2005 Base Realignment and Closure process, it is attributed with the name of the Joint Base. All sites comprising a Joint Base are also attributed to the responsible DoD Component, which is not necessarily the pre-2005 Component responsible for the site. A data dictionary, or other source of attribute information, is accessible at https://doi.org/10.21949/1529039
Service Item Id: 47eb10edd4bb4a9fa6abdb31b8c2e363
Copyright Text: Acknowledgment of the Office of the Assistant Secretary of Defense (OASD) Sustainment, Defense Installations Spatial Data Infrastructure (DISDI), and the Bureau of Transportation Statistics (BTS) [distributor].
Description: The North American Rail Network (NARN) Rail Lines dataset was created in 2016 and was updated on January 29, 2026 from the Federal Railroad Administration (FRA) and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). The NARN Rail Lines dataset is a database that provides ownership, trackage rights, type, passenger, STRACNET, and geographic reference for North America's railway system at 1:24,000 or better within the United States. The data set covers all 50 States, the District of Columbia, Mexico, and Canada. The RROWNER1–3 fields identify the parties responsible for operation, maintenance, and/or ownership to the railroad. It includes the railroad dispatcher (operational control) identifying the specific railroad entity managing the movement of trains over that segment, the maintenance responsibility identifying who is legally obligated to maintain the rail line, and/or the property owner (land and right-of-way) identifying the entity that owns the underlying land. While many railroads own their right-of-way (ROW) in "fee simple", others operate on land owned by a third party. The same entity may fulfill one or more of these roles on the same line. A data dictionary, or other source of attribute information, is accessible at https://doi.org/10.21949/1528950
Service Item Id: 47eb10edd4bb4a9fa6abdb31b8c2e363
Copyright Text: Acknowledgment of the Federal Railroad Administration (FRA) and the Bureau of Transportation Statistics (BTS) [distributor].