NSW Foundation Spatial Data Framework - Transport - Road Associated Structures

Various structural elements associated with the Road dataset.\r\n\r\nThe following are ‘crossings’ being a point feature class representing structures that facilitate the crossing of a road or railway over, under or through another feature.\r\nRoad Bridge: a structure erected over a depression or obstacle to carry a road.\r\nRoad Tunnel: an underground or underwater road passage.\r\n\r\nFloodway: a section of road specifically designed to allow periodic or permanent subjection to water inundation.\r\n\r\nRoad Culvert: a masonry conduit which serves as a channel-crossing for water or a transport network beneath a road.\r\n\r\nFord: a shallow or flat portion of a bed of a watercourse where a crossing may be affected.\r\n\r\nNote the ‘ontype’ attributes of road-segment features mentioned above which have an obvious topological link to these features.

与道路数据集（Road dataset）相关的各类结构要素。

以下为“道口（crossings）”：属于点要素类，用于表示可实现道路或铁路跨越、下穿或穿行其他地物的构筑物。
道路桥梁（Road Bridge）：为跨越凹陷地带或障碍物以通行道路而架设的构筑物。
道路隧道（Road Tunnel）：地下或水下的道路通行通道。
泄洪路段（Floodway）：专为允许周期性或永久性受水淹没而设计的道路区段。
道路涵洞（Road Culvert）：作为道路下方水体或交通网络穿越通道的砖石结构涵管。
浅滩渡口（Ford）：水道河床中较浅且平缓的区段，可在此实现跨水通行。

请注意上文提及的道路路段要素的"ontype"属性，其与上述构筑物存在明确的拓扑关联。