National Waterway Network Nodes

The National Waterway Network Nodes dataset is periodically updated by the United States Army Corp of Engineers (USACE) and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). The National Waterway Network (NWN) is a geographic database of navigable waterways and channels in and around the United States, for analytical studies of navigation performance, for compiling commodity flow statistics, and for mapping purposes. The NWN is comprised of a link database and a node database. Links are line strings, which consist of beginning and end points (nodes) with intermediate vertices (shape points). Links represent either actual shipping lanes (i.e., channels, Intracoastal Waterways, sea lanes, rivers) or serve as representative paths in open water (where no defined shipping paths exist). Nodes may represent physical entities such as river confluences, ports/facilities, and intermodal terminals, USACE nodes, or may be inserted for analytical purposes (i.e., to facilitate routing). A data dictionary, or other source of attribute information, is accessible at https://doi.org/10.21949/1529054国家航道网络节点数据集（National Waterway Network Nodes dataset）由美国陆军工程兵团（United States Army Corp of Engineers, USACE）定期更新，隶属于美国运输部（U.S. Department of Transportation, USDOT）下属运输统计局（Bureau of Transportation Statistics, BTS）的国家交通地图集数据库（National Transportation Atlas Database, NTAD）。国家航道网络（National Waterway Network, NWN）是覆盖美国境内及周边区域的通航水域与航道的地理数据库，可用于航行性能分析、货物流通统计编制以及制图工作。国家航道网络由链路数据库与节点数据库两部分构成。链路为线串（line strings），由起止点（节点）与中间顶点（形状点）组成。链路既可代表实际航运航道，包括航道、内陆水道（Intracoastal Waterways）、海上航线、河流等，也可作为公海水域无明确航运路径时的代表性航行路径。节点可代表实体地理对象，例如河流汇流处、港口/设施、多式联运枢纽（intermodal terminals）、美国陆军工程兵团节点，也可出于分析目的插入以方便路径规划。数据字典（data dictionary）及其他属性信息可通过https://doi.org/10.21949/1529054获取。