GIS 文件中道路拓扑的表示
我现在刚刚进入 GIS，工作中有一个新项目 - 所以我对这一切还是有点陌生。我正在使用 GDAL 来处理上次美国人口普查土地调查中的 TigerLine Shape 文件。在这些文件中，您可以找到（除其他外）描述道路纬度/经度位置的折线集，并且可以找到道路的名称。我没能找到车道、交通信号之类的东西，也许最重要的是，它们如何连接在一起的拓扑结构。例如，拓扑会告诉我，立交桥并不直接连接到下面的道路（即使它们的折线明显相交），而相交的道路在交叉点处连接。拓扑还可以告诉我交通方向。
现在我知道这些东西一定存在，因为苏珊（我的 Garmin GPS）用她带呼吸声的英国口音告诉我该走哪条车道，以及如何穿过城镇到达我要去的地方。她显然具有拓扑意识，因为她从不告诉我在立交桥处左转。这些信息是如何编码在 GIS 文件中的？更好的是，我在哪里可以找到这方面的示例？
谢谢！
I'm just getting into GIS right now with a new project at my work - so I'm still kinda new at all of this. I'm using GDAL to work with the TigerLine Shape files from the previous US census land survey. Within these files you can find (among other things) polyline sets that describe lat/long position of roads and you can find the names of the roads. What I haven't been able to find are things like lanes, traffic signals, and perhaps most importantly, the topology of how it's all connected together. For instance, topology would tell me that an overpass is not directly connected to road below (even though their polylines apparently intersect), whereas intersecting roads are connected at the intersection. Topology would also be able to tell me the traffic direction.
Now I know these things must exist because Susan (my Garmin GPS) tells me in her breathy, British accent which lane to be in and how to get across town to where I'm going. She is apparently topology-aware because she never tells me to take a left at an overpass. How is this information encoded in GIS files, and better yet, where can I find example of this?
Thanks!
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
也许像这样< /a>.
Perhaps something like this way.
获取具有所需拓扑信息的道路数据的最佳选择是私营公司。 NAVTEQ 提供了 NAVSTREETS 数据集 的 30 天评估版本，其中包括您提到的所有属性还有更多。
Your best-bet for road data with the topological information you seek is private companies. NAVTEQ offers a 30-day evaluation version of their NAVSTREETS dataset which includes all of the attributes you mentioned and many more.