漫游美国本土的所有州府
获取 48 个美国本土州的州府列表.
In[1]:=
![Click for copyable input](assets.zh/travel-all-capitals-of-the-conterminous-us-states/In_49.png)
capitals =
EntityValue[
EntityClass["AdministrativeDivision", "ContinentalUSStates"],
"CapitalCity"]
Out[1]=
![](assets.zh/travel-all-capitals-of-the-conterminous-us-states/O_38.png)
下载其 GeoPosition 坐标.
In[2]:=
![Click for copyable input](assets.zh/travel-all-capitals-of-the-conterminous-us-states/In_50.png)
GeoPosition[capitals]
Out[2]=
![](assets.zh/travel-all-capitals-of-the-conterminous-us-states/O_39.png)
计算访问城市的次序以最小化测地距离.
In[3]:=
![Click for copyable input](assets.zh/travel-all-capitals-of-the-conterminous-us-states/In_51.png)
GeoPosition[capitals];
{d, perm} = FindShortestTour[%]
Out[3]=
![](assets.zh/travel-all-capitals-of-the-conterminous-us-states/O_40.png)
在地图上显示该路径.
In[4]:=
![Click for copyable input](assets.zh/travel-all-capitals-of-the-conterminous-us-states/In_52.png)
GeoGraphics[{GeoPath[capitals[[perm]]], Red, PointSize[Medium],
Point[capitals]}]
Out[4]=
![](assets.zh/travel-all-capitals-of-the-conterminous-us-states/O_41.png)
现在计算在相同的城市间按同样的顺序驾驶旅行的路线.
In[5]:=
![Click for copyable input](assets.zh/travel-all-capitals-of-the-conterminous-us-states/In_53.png)
td = TravelDirections[capitals[[perm]]];
在地图上显示相应的路径.
In[6]:=
![Click for copyable input](assets.zh/travel-all-capitals-of-the-conterminous-us-states/In_54.png)
GeoGraphics[{td["TravelPath"], Red, PointSize[Medium],
Point[capitals]}]
Out[6]=
![](assets.zh/travel-all-capitals-of-the-conterminous-us-states/O_42.png)
以下是总驾驶距离.
In[7]:=
![Click for copyable input](assets.zh/travel-all-capitals-of-the-conterminous-us-states/In_55.png)
td["TravelDistance"]
Out[7]=
![](assets.zh/travel-all-capitals-of-the-conterminous-us-states/O_43.png)
与测地距离对比.
In[8]:=
![Click for copyable input](assets.zh/travel-all-capitals-of-the-conterminous-us-states/In_56.png)
d
Out[8]=
![](assets.zh/travel-all-capitals-of-the-conterminous-us-states/O_44.png)