获得向下钻取效果状态的最佳方法=＆gt;国会选区

Question

我目前有一张地图显示美国的州多边形。我会 喜欢能够让用户双击状态然后放大 国家和展示国会区（CD）多边形。

我使用kml可以很好地运行各个地图。我不知道是什么 从州到CD的最佳方法。棘手的一点是我需要状态名称/代码，因为我现在知道KML在CD级别生成什么。

我正在使用谷歌地图api v3。

Answer 1

也许我弄错了，但你希望能够双击地图中的某个点并找出被点击的状态？然后缩放到该状态并显示CD地图？

假设情况如此 - 在双击事件中在Google地图中执行reverse geocode。从生成的地理数据中提取状态（结果数组中的倒数第二个数据）。

Google文档的示例回复：

results[0].formatted_address: "275-291 Bedford Ave, Brooklyn, NY 11211, USA",
results[1].formatted_address: "Williamsburg, NY, USA",
results[2].formatted_address: "New York 11211, USA",
results[3].formatted_address: "Kings, New York, USA",
results[4].formatted_address: "Brooklyn, New York, USA",
results[5].formatted_address: "New York, New York, USA",
results[6].formatted_address: "New York, USA", // The state information
results[7].formatted_address: "United States"

如果您想要缩放到预定义的状态地图范围，您可以定义自己的状态或使用标准地理编码来查找状态的坐标。

Answer 2

这是图像：

这是来源：

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