自动从谷歌地图 API 等来源获取限速数据
因此，我开发了一个数学模型，用于根据用户偏好优化骑行路线，并且我正在尝试开发一个应用程序，其中使用 Dijkstra 算法（当然还有图表）来解决该解决方案。边缘的部分权重是基于道路的速度限制，所以我的问题是：
是否有一个好的开源库，例如 Google Maps API 或类似的东西，我可以在其中自动收集这些数据？手动对相关图表（华盛顿州西雅图市）进行此操作是不可能的，但我不知道在哪里可以自动化（或编写半自动化程序）速度限制数据的收集，或者甚至首先获得它。我基本上需要速度限制信息的来源，谷歌地图似乎是最有希望的，但我找不到任何东西。
谢谢，
泰勒米勒
So, I developed a math model for optimizing biking routes based on user preference, and I am trying to develop an application where the solution is solved using Dijkstra's algorithms (and of course graphs). Part of the weighting of the edges is based on the speed limit of a road so my question is:
Is there a good open-source library, such as Google Maps API or something similar, where I could automate the collection of this data? It would be impossible to do this for the graph in question by hand (the city of Seattle, WA), but I don't know where I can automate (or write a program to semi-automate), the collection of speed limit data, or even acquire it in the first place. I basically need a source of speed limit information, and google maps seems the most promising, but I cannot find anything.
Thanks,
tylerthemiler
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几年前我需要此类数据，但没有成功。谷歌没有提供这些数据，Navteq 和 Teleatlas 也有同样的问题。最好的临时解决方案（直到您找到准确的方法为止）是获取您所在国家/城市等所有道路类型的标准速度限制，并将其与当前道路类型进行匹配。这将为您的申请提供良好的开端，并且在大多数情况下，速度限制是法律规定的。
I needed that kind of data a few years back, but with no luck. Google doesn`t give that data, Navteq and Teleatlas with the same issue. The best temporary solution ( until you will find an accurate way to do that ) is to get the standard speed limit for all the road types in your country/city/etc, and match it againnst the current road type . This will provide you a good start in your application and in most of the cases the speed limit is the one specified by law.