Strategic Highway Network (STRAHNET)

The Strategic Highway Network (STRAHNET) dataset and its geometries was updated on August 8, 2025 from the Federal Highway Administration (FHWA) and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). The layer represents the Strategic Highway Network (STRAHNET). The STRAHNET is a subset of the National Highway System (NHS) and includes information such as road segments, direction, build date, state codes, functional classification, ownership, and other attributes related to highways in the United States. The provided information outlines the preparation of a layer that represents the National Highway System (NHS) in the context of the HPMS 2020 Geometric network and attribute definition source HPMS 2020. The NHS layer incorporates attributes from HPMS, and the conflation process involves the transfer of State_Code, Year_Record, Route_ID, Begin_Point, End_Point, and F_SYSTEM fields. Calibration of Begin_Point and End_Point is performed based on shape length and sequence for split links. The minimum positional accuracy is specified at a spatial resolution of 1:100,000 or better, although most state-submitted data ranges between 1:5,000 to 1:10,000. The spatial data organization method is described as a vector using the SDTS (Spatial Data Transfer Standard) Point and Vector Object Type with a count of 626,366 objects. The coordinate system is defined in geographic terms with a horizontal datum of D WGS 1984, employing decimal degrees for latitude and longitude. The entity and attribute information is comprehensive, covering various aspects of the NHS and HPMS data. A data dictionary, or other source of attribute information, is accessible at https://doi.org/10.21949/1529838本战略公路网（Strategic Highway Network, STRAHNET）数据集及其几何信息于2025年8月8日由美国联邦公路管理局（Federal Highway Administration, FHWA）更新，隶属于美国运输部（U.S. Department of Transportation, USDOT）/运输统计局（Bureau of Transportation Statistics, BTS）国家交通地图集数据库（National Transportation Atlas Database, NTAD）。该图层对应战略公路网（STRAHNET）。STRAHNET是国家公路系统（National Highway System, NHS）的子集，涵盖美国公路的路段、走向、建设日期、州代码、功能分类、权属及其他相关属性信息。本次提供的信息阐述了基于HPMS 2020几何网络与属性定义源HPMS 2020制作国家公路系统（NHS）图层的流程。NHS图层整合了HPMS的属性数据，融合过程涉及转移State_Code、Year_Record、Route_ID、Begin_Point、End_Point及F_SYSTEM字段。针对拆分的路段，将基于形状长度与序列对Begin_Point与End_Point进行校准。数据集的最低位置精度要求为空间分辨率不低于1:100,000，不过大多数州提交的数据精度区间为1:5,000至1:10,000。空间数据采用矢量格式组织，遵循SDTS（Spatial Data Transfer Standard, 空间数据传输标准）点与矢量对象类型规范，共计包含626,366个对象。坐标系采用地理坐标系，水平基准面为D WGS 1984，经纬度以十进制度为单位。实体与属性信息覆盖全面，涵盖NHS与HPMS数据的多个维度。可通过https://doi.org/10.21949/1529838获取数据字典或其他属性信息来源。