"GeographicRegion" 多边形
新的地理实体领域 "GeographicRegion" 可以描述整个大陆和其他类型的地理实体.
非洲作为一个地理区域实体代表整个大陆.
In[1]:=
![Click for copyable input](assets.zh/geographicregion-polygons/In_20.png)
africa = EntityValue[Entity["GeographicRegion", "Africa"],
EntityProperty["GeographicRegion", "Polygon"]]
Out[1]=
![](assets.zh/geographicregion-polygons/O_19.png)
In[2]:=
![Click for copyable input](assets.zh/geographicregion-polygons/In_21.png)
GeoGraphics[{EdgeForm[White], FaceForm[Red], africa},
GeoBackground -> "Satellite"]
Out[2]=
![](assets.zh/geographicregion-polygons/O_20.png)
还可以获取非洲所有国家的外形.
In[3]:=
![Click for copyable input](assets.zh/geographicregion-polygons/In_22.png)
africacountries =
EntityValue[Entity["GeographicRegion", "Africa"],
EntityProperty["GeographicRegion", "PolygonCountryBoundaries"]];
In[4]:=
![Click for copyable input](assets.zh/geographicregion-polygons/In_23.png)
GeoGraphics[{EdgeForm[White], FaceForm[Red], africacountries},
GeoBackground -> "Satellite"]
Out[4]=
![](assets.zh/geographicregion-polygons/O_21.png)