在Mathematica中，一个choropleth贴图的最小示例是什么样的? [英] What would a minimal example for a choropleth map in Mathematica look like?

问题描述

在Mathematica中 Choppleth 地图的最小示例是什么?看起来像什么?

What would a minimal example for a choropleth map in Mathematica look like?

我可以使用Import读取ESRI Shapefile，但是不知道如何处理导入的结果.

I can read in a ESRI Shapefile using Import, but do not know how to work with the imported result.

推荐答案

Graphics[
   {
    ColorData["ThermometerColors"][
                            Rescale[CountryData[#, "GDPPerCapita"], {100, 50000}]
                                  ] /. HoldPattern[Blend[___]] -> Yellow, 
    CountryData[#, "Polygon"]
   } & /@
   CountryData[]
]

为什么要更换?如果没有给定国家/地区所需类型的数据，CountryData将返回Missing ["NotAvailable"]，从而导致ColorData及其基础Blend函数不返回特定的RGB值.我将此未评估的Blend替换为黄色.

And why the replacement? If there are no data of the required type for a given country CountryData returns Missing["NotAvailable"], causing ColorData, and its underlying Blend function not to return a specific RGB value. I replace this unevaluated Blend with the color Yellow.

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