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I've been playing with some mapping and visualizing data. One problem that I'm running into though is that I don't have a lot of the polygon data for various regions I'd like to map. I have SOME kml for some of the points, but I need many many more. Ideally, if I could, I'd love to get kml files for every city within a state so that I can display them a county at a time.

Does anyone where a nice open source of KML data? I had a slight hope that google might provide them from some obscure path, but haven't had any luck. I was also hoping that it might be available through US Census data, but digging through there for anything is always a challenge.

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Here is one source of KMZ files: http://www.gadm.org/.

Another source of data is the Natural Earth Data which is available from FusionTables

于 2013-09-25T16:10:14.480 回答
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美国人口普查数据创建了许多 KML 数据文件。

这是 KML 和 shape 文件中人口普查的直接来源。例如，此站点有美国的综合道路数据：http
://www.census.gov/geo/www/tiger/ 注意 KML（一种新可用的数据格式）仅来自 2010 年人口普查，但形状文件数据是广泛用于 2006-2013 年。

此外，这里是基于美国人口普查数据的免费 KML 集合，显示州级和县级的各种统计数据（例如人口密度、中位年龄等）。

于 2013-09-27T00:40:38.320 回答